ModifiedPremera BluecrossPolicy 7.01.47

Bariatric (weight loss) surgery coverage

Defines medical necessity, exclusions, documentation, and coding for bariatric surgery (adults and adolescents) and related revisions/conversions for Premera Blue Cross members when the health plan benefit allows coverage.

Policy Summary

PayerPremera Bluecross

PolicyBariatric (weight loss) surgery coverage

Policy CodePolicy 7.01.47

Change TypeRevised — material changes added

Effective DateNov 7, 2025

Next Review Date

Key ActionSubmit prior authorization with documentation of 3 months participation in a physician‑administered weight reduction program and required clinical records.

SourceLink

POLICY UPDATE CHANGES

Policy has been revised (see header indicating revision and effective date Nov. 7, 2025).

Added the obesity BMI threshold for the Asian population as a medically necessary selection criterion for bariatric surgery.

Added criterion for reoperation for inadequate weight loss defined as failure to lose at least 50% of excess body weight or failure to achieve at least 20% total weight loss.

Changed physician-administered weight loss program participation requirement from six months to three months within the past 12 months.

Clarified obstructive sleep apnea comorbidity criteria by adding definition of CPAP and oral appliance failure and added BIPAP term.

2025-11-07Policy effective

BMI ≥40Primary BMI threshold

BMI 35–39.9Class II threshold

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≥3 monthsWeight program req.

≥50% EBW / ≥20% TWLReoperation metric

Not for MAExclusion note

Coverage and Medical Necessity Criteria

Prior Authorization

Provider Action Summary

Bariatric surgery requires prior authorization. Providers must submit complete clinical documentation to support medical necessity at the time of authorization request. A summary letter from the requesting bariatric surgeon alone is not sufficient.

Prior authorization is required for all bariatric procedure codes listed in this policy prior to scheduling elective surgery.
Submit comprehensive clinical documentation dated within 12 months of the requested procedure, including: recent height/weight and calculated BMI, documentation of conservative weight-loss attempts (see below), comorbidity documentation and objective testing (e.g., HbA1c for diabetes, sleep study results for OSA, cardiac evaluations as indicated), and mental health evaluation and clearance by a licensed mental health provider.
For adults with type 2 diabetes, include serial HbA1c values demonstrating inadequate glycemic control (HbA1c ≥7%) despite lifestyle change and antidiabetic medications.
For moderate to severe obstructive sleep apnea (OSA), provide documentation of diagnosis and that CPAP/BiPAP or oral appliance therapy was tried and is inadequate or not tolerated.
Procedure-specific device prior authorization: for adjustable gastric banding (CPT 43770) include device model and FDA indication; note that band devices are not FDA-approved for patients <18 years.
Coding and prior-authorization history: include any prior bariatric procedures (dates and CPT codes), previous revision/conversion procedures, and evidence of compliance with postoperative follow-up for prior procedures when applicable.
Medicare noncoverage triggers: for Medicare members, note that Medicare National Coverage Determination excludes (noncovered) open or laparoscopic sleeve gastrectomy and some other procedures; this policy does not apply to Medicare Advantage members — verify benefit applicability with payer.
If selection criteria are not met, provide documentation of attempted conservative measures and rationale; lacking required documentation may result in denial as not medically necessary.
If benefit mismatch (member contract excludes bariatric surgery or age limits apply), contact member services; authorization may be denied despite clinical eligibility.

Documentation Required

Required Clinical Documentation

The following items are required in the authorization request to establish medical necessity for initial or revision bariatric procedures (all documentation should be current, generally within the prior 12 months unless otherwise specified):

Demographics and clinical measurements: height, weight, calculated BMI (note: lower BMI thresholds apply for specified Asian populations per policy).
Detailed physician documentation of failure of conservative weight-loss measures. For adults this includes participation in a physician-administered or structured weight-reduction program for at least three continuous months within the 12 months before surgery (examples: MediFast, OptiFast) OR documentation of participation in a structured commercial program (e.g., Weight Watchers, Jenny Craig) with physician supervision.
For revisions/reoperations: operative reports from prior bariatric surgeries, documentation of prior postoperative compliance, evidence of initial success followed by objective failure (e.g., pouch dilation documented by upper GI or endoscopy) or specific complication (band erosion, slippage, leak, obstruction, staple-line failure).
Mental health evaluation and clearance by a licensed mental health provider addressing contraindications (substance abuse, eating disorder, inability to consent, inability to comply with pre/post requirements).
Preoperative evaluations: cardiac risk assessment and clearance as indicated, nutritional screening and baseline labs, and documented plan for long-term follow-up.
For individuals with type 2 diabetes: objective glycemic control data (HbA1c values) showing inadequate control (≥7%) despite medical therapy.
For OSA: sleep study results and documentation of trials of CPAP/BiPAP or oral appliance with intolerance or inadequate control when OSA is the qualifying comorbidity.

Billing Rule

Prior Authorization and Coding Guidance

Prior authorization applies to the bariatric procedure CPT codes and certain device implants. Use the following coding expectations when requesting authorization and submitting claims.

Include the primary CPT code for the planned bariatric procedure and any relevant modifier(s).
If submitting an unlisted procedure code (e.g., 43659, 43999, 44238, 44799) or device-specific codes (e.g., gastric balloon HCPCS/CPT), provide operative report and device documentation.
CPT 43846 describes short-limb Roux-en-Y gastroenterostomy (≤150 cm); long-limb gastric bypass procedures (>150 cm) (CPT 43847) are considered investigational for primary treatment and require explicit justification and prior review.
Document prior authorization history: include previous authorization numbers, dates of prior bariatric procedures, and outcomes when requesting revision or reoperation.
Device-specific codes: for adjustable gastric banding (CPT 43770), document device model and FDA indication; ensure coding aligns with device and any reservoir or adjustment procedures.
Failure to provide operative reports or prior procedure documentation may delay or deny authorization for revision/ conversion procedures.

Documentation Required

Conservative Measures and Preoperative Weight-Loss Attempts

Conservative measures must be documented prior to approving bariatric surgery. Providers should clearly describe prior non-surgical weight management efforts.

Required conservative measures for adults: documentation of participation in a physician-administered or structured weight reduction program for at least three continuous months within the prior 12 months, or documented supervised commercial program with physician oversight.
Historically the policy required six months; current policy allows a 3-month physician-administered program within 12 months (effective 05/01/21).
Include records of dietitian or behavioral counseling visits, prescribed pharmacotherapy trials (if used), and objective weight trend data showing failure to achieve adequate weight loss.
For adolescents, describe prior multidisciplinary interventions and developmental/psychosocial readiness; devices for LAGB are not FDA-approved under age 18 and must be documented if contemplated.

Documentation Required

Preoperative Evaluation and Nutritional/EGD Screening

Specific preoperative evaluations and screenings should be provided as part of the authorization packet.

Nutritional screening and baseline laboratory studies (including micronutrient assessment as indicated) with documentation of any deficiencies and treatment plan.
Mental health evaluation and clearance by a licensed mental health provider addressing ability to consent and adherence potential.
Cardiac assessment and clearance when clinically indicated.
For moderate to severe OSA, documentation of diagnosis and a trial of CPAP/BiPAP or oral appliance with evidence of intolerance or inadequate response.
Endoscopic evaluation (EGD) reports when performed; routine preoperative EGD is not required for all patients but include findings when they affect management.

Note

Medicare Noncoverage & Benefit Applicability

Provider notes on Medicare and benefit applicability

This policy does not apply to Medicare Advantage members — verify Medicare Advantage plan rules separately (see History and Scope).
For traditional Medicare beneficiaries, CMS NCD (2006) requires BMI ≥35 kg/m2 with at least one obesity-related comorbidity and prior unsuccessful medical treatment; certain procedures (open/laparoscopic sleeve gastrectomy, open adjustable gastric banding) were listed as noncovered under earlier NCD determinations — verify current Medicare guidance before authorization.
If the member’s contract excludes bariatric procedures or has age restrictions, the request may be denied due to benefit mismatch even if medical criteria are met.

Procedure, Device, and Billing Codes

Covered and billed procedure codes listedmixed

0813T	Esophagogastroduodenoscopy, flexible, transoral, with volume adjustment of intragastric bariatric balloon (Spatz3)
43290	Esophagogastroduodenoscopy, flexible; transoral; with deployment of intragastric bariatric balloon
43291	Esophagogastroduodenoscopy, flexible; transoral; with removal of intragastric bariatric balloon(s)
43644	Laparoscopy, surgical, gastric restrictive procedure; with gastric bypass and Roux‑en‑Y gastroenterostomy (roux limb 150 cm or less)
43645	Laparoscopy, surgical, gastric restrictive procedure; with gastric bypass and small intestine reconstruction to limit absorption
43659	Unlisted laparoscopy procedure, stomach
43770	Laparoscopy, surgical, gastric restrictive procedure; placement of adjustable gastric restrictive device (eg, gastric band and subcutaneous port components)
43771	Laparoscopy, surgical, gastric restrictive procedure; revision of adjustable gastric restrictive device component only
43772	Laparoscopy, surgical, gastric restrictive procedure; removal of adjustable gastric restrictive device component only
43773	Laparoscopy, surgical, gastric restrictive procedure; removal and replacement of adjustable gastric restrictive device component only

1–10 of 26

1/3

HCPCS and Unlisted procedure codesmixed

43886	Gastric restrictive procedure, open; revision of subcutaneous port component only.
43887	Gastric restrictive procedure, open; removal of subcutaneous port component only.
43888	Gastric restrictive procedure; open; removal and replacement of subcutaneous port component only.
43999	Unlisted procedure; stomach
44238	Unlisted laparoscopy procedure, intestine (except rectum).
44799	Unlisted procedure; small intestine.
C9784	Gastric restrictive procedure, endoscopic sleeve gastroplasty, with esophagogastroduodenoscopy and intraluminal tube insertion, if performed, including all system and tissue anchoring components.
C9785	Endoscopic outlet reduction, gastric pouch application, with endoscopy and intraluminal tube insertion; if performed, including all system and tissue anchoring components.

Covered CPT Codes (procedures described)CPTCovered

43846	Open gastric bypass (Roux‑en‑Y).
43644	Laparoscopic gastric bypass.
43770	Laparoscopic adjustable gastric banding.
43775	Sleeve gastrectomy.
43847	Biliopancreatic diversion (Scopinaro procedure).
43845	Biliopancreatic diversion with duodenal switch.

Biliopancreatic diversionCPT

43847

Open or laparoscopic biliopancreatic diversion (BPD) / Scopinaro procedure

Duodenal switchCPT

43845

Open or laparoscopic biliopancreatic diversion with duodenal switch

Vertical-banded gastroplastyCPT

43842

Vertical-banded gastroplasty (VBG)

Gastric bypass variantsCPT

43847	Long-limb Roux-en-Y gastric bypass referenced (also used for other bypass procedures)
43846	Gastric bypass (short limb <150 cm) — does not apply to long-limb gastric bypass

Laparoscopic malabsorptive procedureCPT

43645

Laparoscopic malabsorptive procedure (nonspecific malabsorptive procedure code)

Gastric restrictive procedures (plication etc.)CPT

43843

Gastric restrictive procedure, without gastric bypass, for morbid obesity; other than vertical-banded gastroplasty (used for gastric plication)

Ongoing/unpublished clinical trial identifiersmixed

NCT04506190	Prospective Multicenter Study to Evaluate Perioperative Outcomes of Laparoscopic and Robotic-Assisted Revisional Bariatric Surgery
NCT04128995	Surgical or Medical Treatment for Pediatric Type 2 Diabetes
NCT03236142	SIPS vs Standard Duodenal Switch randomized trial
NCT02692469	Single Anastomosis Duodenal-Jejunal Bypass with Sleeve Gastrectomy vs Duodenal Switch trial
NCT04165694	Single Anastomosis Duodenal Ileal Bypass (SADI) as a Second Stage for Sleeve Gastrectomy Weight Loss Failure
NCT01172899	The BASIC Trial - Morbid Obesity in Children and Adolescents

Medicare covered vs noncovered procedures (procedural names)mixed

Not specified

Medicare NCD lists covered procedures (RYGBP, LAGB, BPD/DS) and noncovered procedures (open/laparoscopic SG, etc.) but does not provide CPT/HCPCS codes in this excerpt.

FDA-approved bariatric devicesmixed

PMA device list

Device names (Obalon, ORBERA, AspireAssist, LAP-BAND, REALIZE) with labeled BMI indications; no billing codes provided in excerpt.

Historical CPT/HCPCS codes referenced in historymixed

43845	Biliopancreatic bypass with duodenal switch (as referenced in history)
44.99	Code added in code updates (history notes)

Unlisted CPT codes (non-covered/used in coding table)CPT

43659	Unlisted procedure, stomach
43999	Unlisted procedure, stomach
44238	Unlisted procedure, intestines
44799	Unlisted procedure, large intestine

New CPT codes addedCPT

0813T	New CPT code added
43290	Endoscopic procedure code added
43291	Endoscopic procedure code added

New HCPCS codesHCPCS

C9784	HCPCS code added
C9785	HCPCS code added

Key numeric thresholds — BMI and related numeric criteria

Class III obesity (adult)BMI ≥ 40 kg/m2 (≥37.5 kg/m2 for Asian individuals)

Class II obesity (adult)BMI 35–39.9 kg/m2 (32.5–37.4 kg/m2 for Asian individuals) with ≥1 obesity‑related comorbidity

Class I obesity with T2DBMI 30.0–34.9 kg/m2 (27.5–32.4 kg/m2 for Asian individuals) — considered when inadequate glycemic control

Adolescent severe obesity examples

Authorization, Documentation, and Operational Requirements

Prior Authorization

Prior authorization required and document preoperative program/mental health clearance

Prior authorization is required per plan rules for bariatric procedures and associated CPT/HCPCS codes listed in the policy. Documentation submitted with authorization must include required preoperative weight‑loss program participation and mental health evaluation/clearance.

Evidence of participation in a physician‑administered weight reduction program within 12 months (see documentation details).
Mental health evaluation and clearance by a licensed mental health provider.

Prior Authorization

Authorization should reference listed CPT/HCPCS codes

Prior authorization is implied for the specific bariatric CPT and HCPCS codes listed in the coding section; authorization requests should reference the exact code(s) for the planned procedure.

Examples of listed codes include 43644, 43770, 43775, 43845, 43846, 43847, 43886–43888, 43999, 44238, 44799, 0813T, 43290, 43291, C9784, C9785.

Clinical Background and Evidence Summaries

Bariatrics addresses the causes and treatment of obesity and its complications. Severe obesity substantially increases the risk of type 2 diabetes, cardiovascular and pulmonary disease, and musculoskeletal disability. When conservative measures fail, metabolic and bariatric surgery can provide durable weight loss and improvement in obesity‑related comorbidities; however, procedures carry operative risk and require selection through multidisciplinary evaluation and performance by experienced surgeons in accredited programs.

Clinical guidelines and evidence syntheses support surgery for adults with Class III obesity (BMI ≥40 kg/m2) and for adults with Class II obesity (BMI 35–39.9 kg/m2) with at least one significant obesity‑related comorbidity, while carefully considering selected patients with lower BMI ranges when type 2 diabetes is inadequately controlled by medical therapy.

Definitions and Key Terms

Body mass index (BMI) — Formula and unit conversion factors

BMI formulaBMI = weight (kg) ÷ [height (m)]^2

Pounds to kilograms conversionMultiply pounds by 0.45 to convert to kilograms

Inches to meters conversionMultiply inches by 0.0254 to convert to meters

BMI calculation — BMI formula and conversions

BMI calculation (concise)BMI = weight in kilograms divided by height in meters squared; use standard conversion factors for lb→kg and in→m

Adult and adolescent calculatorsPolicy references BMI calculators for adults ≥20 and adolescents <20 for exact percentile calculations

Policy Updates and History

2006-??-??Medicare NCD

CMS published a 2006 National Coverage Determination stating RYGBP, LAGB, and BPD/DS were reasonable and necessary for Medicare beneficiaries with BMI >35 kg/m2 plus comorbidity and prior unsuccessful medical therapy, and listing several procedures (including open/laparoscopic sleeve gastrectomy and vertical-banded gastroplasty) as noncovered.

1997-05-05Policy addition

Initial policy added to the surgery section as a new policy entry.

2003-02-11

Policy Summary

PayerPremera Bluecross

PolicyBariatric (weight loss) surgery coverage

Policy CodePolicy 7.01.47

Change TypeRevised — material changes added

Effective DateNov 7, 2025

Next Review Date

Key ActionSubmit prior authorization with documentation of 3 months participation in a physician‑administered weight reduction program and required clinical records.

SourceLink

On This Page

Esophagogastroduodenoscopy (EGD): if performed preoperatively or postoperatively, include endoscopy reports. Routine preoperative EGD is not universally required; include EGD findings only when they alter management (e.g., esophagitis, Barrett’s, ulceration, anatomic issues after sleeve gastrectomy such as severe reflux).

If seeking conversion for post-sleeve GERD, include objective abnormal 24-hour pH monitoring or endoscopic evidence of esophagitis and documentation of persistent symptoms despite at least 8 weeks of daily proton pump inhibitor therapy.

≥120% of the 95th percentile for age/sex (class 2) or ≥140% of the 95th percentile (class 3)

Physician‑administered preop weight program≥3 continuous months participation within the prior 12 months

BMI thresholds — adult primary thresholds and Asian population notes

Primary adult BMI threshold (standard)BMI ≥ 40 kg/m2 OR BMI 35–39.9 kg/m2 with at least one clinically significant obesity‑related disease

Asian population adjustment — Class IIIBMI ≥ 37.5 kg/m2 for Asian individuals (equivalent to standard Class III)

Asian population adjustment — Class IIBMI 32.5–37.4 kg/m2 with at least one comorbidity for Asian individuals

Diabetes diagnostic thresholds — HbA1c and glucose thresholds referenced

Diagnostic HbA1c threshold for diabetesHbA1c ≥ 6.5% (diagnostic); policy uses HbA1c ≥7% to define inadequate glycemic control for surgical consideration

Fasting blood glucose (diagnostic)Fasting blood sugar ≥ 126 mg/dL

Oral glucose tolerance (diagnostic)2‑hour glucose ≥ 200 mg/dL on glucose tolerance testing

Body Mass Index (BMI) — Class definitions

Class I obesityBMI 30.0–34.9 kg/m2

Class II obesityBMI 35.0–39.9 kg/m2

Class III (morbid) obesityBMI ≥ 40.0 kg/m2

BMI thresholds — ranges described across guidelines

Adults eligible for MBS (society consensus)Adults with BMI ≥40 kg/m2; adults with BMI ≥35 kg/m2 and ≥1 severe obesity‑related comorbidity; adults with BMI 30–34.9 kg/m2 with T2D may be considered

Adolescent thresholds (ASMBS/AAP)BMI ≥120% of 95th percentile with comorbidity or BMI ≥140% of 95th percentile without comorbidity

Ethnicity‑adjusted thresholdsClinical obesity in Asian adults defined at BMI ≥25 kg/m2; societies recommend lower BMI cutpoints for Asians

BMI thresholds and device duration — adolescent thresholds and device labeling durations

Adolescent operative thresholdsConsider MBS for adolescents with BMI >120% of 95th percentile with major comorbidity or >140% without comorbidity

Intragastric balloon device labeled BMI rangeFDA‑approved intragastric balloons: BMI 30–40 kg/m2 with maximum placement ~6 months

AspireAssist device labeled BMI rangeAspireAssist indicated for adults with BMI 35–55 kg/m2

BMI — literature references discussing BMI thresholds

Published literature on BMI thresholdsSystematic reviews and RCTs discuss benefits of MBS across BMI categories including BMI ≥35 and BMI 30–34.9 kg/m2 with T2D (see references)

Adolescent evidenceSystematic reviews/meta‑analyses and recent RCTs report outcomes of bariatric surgery in adolescents with severe obesity

Revisional surgery evidenceSystematic reviews and cohort studies evaluate outcomes and indications for conversion/revision after failed primary procedures

Reoperation inadequate weight loss threshold — failure definitions

Inadequate weight loss — excess body weight (EBW)Failure to lose ≥50% of excess body weight is a criterion for reoperation

Inadequate weight loss — total weight loss (TWL)Failure to achieve ≥20% total weight loss is an alternative criterion for reoperation

Timing for reoperationPrior surgery should be ≥2 years before repeat procedure per reoperation criteria context

Physician‑supervised weight loss program duration — 3 months within past 12 months

Required physician‑administered program durationParticipation in a physician‑administered weight reduction program for at least 3 continuous months (90 days) within the prior 12 months

Acceptable evidence of participationDocumentation may include weights, current dietary program, and physical activity or participation in structured programs (e.g., Weight Watchers) under physician supervision

Documentation timeframeProgram participation must be documented within 12 months before the proposed surgery

Prior Authorization

Specify exact procedure code and operative details

Prior authorization should specify the exact bariatric procedure code and, when relevant, procedural details (for example, limb lengths for Roux‑en‑Y variants) because CPT codes differentiate procedure variants.

document operative details such as whether a short-limb (<150 cm) RYGB (CPT 43846) versus long-limb variants are planned.

Note

Provide guideline-based BMI/comorbidity rationale

Use guideline-based BMI and comorbidity thresholds in clinical justification for authorization decisions (e.g., BMI ≥40 kg/m2; BMI ≥35 kg/m2 with at least one obesity‑related comorbidity; BMI 30–34.9 kg/m2 with T2D under specified conditions).

Include relevant comorbidity data (e.g., T2D control, OSA severity) in the authorization submission.

Prior Authorization

Reference device-labeled BMI indications and limits

Device procedures must be authorized consistent with the device’s labeled BMI indications and duration limits (for example, intragastric balloons have labeled BMI ranges and maximum placement times).

If using an implantable device (eg, intragastric balloon, AspireAssist, LAP‑BAND), reference the device’s FDA‑labeled BMI criteria and duration in the authorization.

Note

Policy history does not define current authorization triggers

The policy history and coding updates are documented in the history section but do not replace current authorization criteria; providers should follow current plan prior‑authorization processes and submit required clinical documentation.

History summarizes prior code additions/changes; it does not list operational authorization triggers.

Prior Authorization

Certain listed and unlisted codes may require Premera prior authorization

Certain CPT, HCPCS and unlisted procedure codes included in the coding tables may require prior authorization per Premera processes; submit clinical documentation that meets the policy’s medical‑necessity criteria with the authorization.

Examples: unlisted codes 43659, 43999, 44238, 44799 and newer codes 0813T, 43290, 43291; HCPCS C9784/C9785.

Step Therapy

Document CPAP/BiPAP or oral appliance trial and failure for OSA

For individuals with moderate to severe obstructive sleep apnea, document a trial and failure or documented intolerance of CPAP/BiPAP or oral appliance prior to surgery consideration.

CPAP/BiPAP/oral appliance failure is defined as residual AHI ≥15 or inability to tolerate CPAP/BiPAP >4 hours per night for >5 nights per week.

Documentation Required

Document failure of conservative weight‑loss measures

Provide evidence of prior conservative (nonsurgical) weight‑loss measures and review of these attempts in the record prior to surgical consideration; lack of documented failure to conservative measures may lead to denial.

Document prior diet/exercise attempts, supervised programs, and practitioner review.

Step Therapy

No mandatory step‑therapy sequence specified

No explicit step‑therapy sequencing is prescribed by this policy; evidence summaries compare surgical versus nonsurgical therapy but the policy does not mandate a sequential medication‑then‑surgery pathway.

Providers should still document prior conservative therapy as described elsewhere in the policy when relevant.

Note

Prior weight‑loss attempts are not absolute prerequisites

Guidelines state that prior weight‑loss attempts should not be an absolute barrier to surgery; however, compliance with multidisciplinary preoperative programs may improve outcomes.

Do not require multiple unsuccessful weight‑loss attempts as a prerequisite, but document participation where applicable.

Documentation Required

Medicare requires prior unsuccessful medical treatment documentation

For Medicare beneficiaries, documentation of prior unsuccessful medical treatment for obesity is required per the 2006 Medicare NCD (BMI >35 kg/m2 with at least one comorbidity) to meet coverage conditions.

Include documentation of prior medical treatments when authorizing procedures for Medicare populations.

Note

Historical references to conservative measures do not create current step rules

Historical policy mentions conservative measures in prior revisions but does not establish new operational step‑therapy rules; rely on the current policy text for authorization requirements.

Documentation Required

Expect documentation of prior supervised conservative management

Patients are expected to have undergone conservative measures (supervised diet, exercise, behavior modification) before consideration for bariatric surgery; provide documentation of these efforts.

Include program name, dates, documented weights, and practitioner oversight where available.

Documentation Required

Document active participation in physician‑administered weight reduction program

Provide documentation within 12 months showing active participation in a physician‑administered weight reduction program (including weight, current dietary program, and exercise) or supervised structured program; a surgeon’s summary letter alone is insufficient.

Acceptable evidence includes program records (e.g., MediFast/OptiFast) or participation in structured programs supervised by a healthcare provider.

Documentation Required

Document preoperative weight, BMI, and EWL/TWL calculations

Include preoperative weight, calculated BMI, prior weight‑loss attempts, and calculations of percent excess weight loss (EWL) or total weight loss (TWL) in the medical record for authorization and medical‑necessity review.

Use provided formulas to calculate EWL and TWL when documenting prior weight loss.

Documentation Required

Document specific procedure and operative details (limb lengths, pylorus preservation)

Document the specific bariatric procedure performed (for example, CPT 43847 for BPD, 43845 for duodenal switch, 43842 for VBG, 43846/43847 distinctions for RYGB) and relevant operative details such as limb lengths and whether the pylorus is preserved.

Specify alimentary/common limb lengths for bypass procedures when applicable.

Documentation Required

Document multidisciplinary preoperative evaluation and nutritional screening

Ensure multidisciplinary preoperative evaluation and nutritional screening are documented, including optimization of comorbidities and screening/management of nutritional deficiencies prior to surgery.

Document nutritional screening (eg, vitamin B1) and plans for management if deficiencies are identified.

Denial Risk

Limit EGD documentation to clinically relevant findings; routine EGD may be denied

Document preoperative EGD findings only when they affect procedure choice (for example, large hiatal hernia, peptic ulcer, H. pylori); routine preoperative EGD is not supported by evidence and may be denied if billed as routinely necessary.

If EGD is performed, include findings and how they influenced surgical planning or management.

Note

Cite guideline references when EGD affects management

References (ASMBS position statement and others) discuss preoperative EGD utility and guidance; include these findings in clinical justification when relevant, but note that the policy does not mandate routine EGD.

Documentation Required

Document 3‑month physician‑administered program participation and comorbidity details

Document participation in a physician‑administered weight loss program of at least 3 continuous months within the prior 12 months, and document comorbidities (including OSA management status and CPAP/BiPAP/oral appliance failure when applicable) for authorization.

Include dates, weights during the program, current dietary plan, and exercise regimen.

Denial Risk

Verify member benefit coverage; routine liver biopsy without indications is not covered

Services may be denied if the member’s health plan contract does not include coverage for bariatric surgery or its complications; routine liver biopsy during obesity surgery without preoperative signs/symptoms is considered not medically necessary and may be denied.

Verify member benefit coverage before submitting authorization; document contract allowances when relevant.

Denial Risk

Failure to document conservative management may result in denial

Lack of documented failure to respond to conservative measures for weight reduction prior to consideration of bariatric surgery may lead to denial; practitioners should review and document prior attempts.

Document dietary, exercise, behavioral programs and practitioner review of attempts.

Denial Risk

Routine preoperative EGD may be denied if unindicated

Routine preoperative EGD often does not alter management; billing EGD as routinely necessary without documented clinical indication may be denied.

Note

No extra operational PA steps specified in history

No additional operational prior authorization procedures or documentation requirements are specified in the cited history chunks; follow current plan prior‑authorization instructions.

Denial Risk

Medicare noncovered procedures may trigger denial for Medicare beneficiaries

Procedures determined by Medicare as not reasonable and necessary (for Medicare beneficiaries) — such as open/laparoscopic sleeve gastrectomy per the 2006 NCD — are considered noncovered and could trigger denial for that population.

Confirm Medicare-specific coverage rules before authorizing procedures for Medicare beneficiaries.

Note

History lists changes but not current PA triggers

The policy history documents prior additions and code updates but does not enumerate current authorization triggers; rely on the active policy text and plan prior‑authorization procedures for requirements.

Denial Risk

Failure to meet selection criteria may result in denial

If required selection criteria are not met (including documented physician‑supervised weight loss participation and comorbidity documentation), services can be considered not medically necessary and denied.

Ensure documentation of program participation, comorbidity severity/control, and other selection criteria before requesting authorization.

Denial Risk

Do not apply this policy to Medicare Advantage members

Applying this policy to Medicare Advantage members is inappropriate because the policy does not apply to Medicare Advantage; doing so may lead to denials based on benefit mismatch.

Documentation requirement

Record weight and height used for BMI calculation in the medical record for preop evaluation

Class III (morbid) obesity — Definition and comorbidity note

Definition — Class III (morbid) obesityBMI ≥ 40 kg/m2, or BMI ≥ 35 kg/m2 with at least one clinically significant obesity‑related disease

Associated comorbidity noteComorbid conditions include T2D, OSA, coronary artery disease, medically refractory hypertension, peripheral arterial disease, etc.

Clinical significance assessmentThresholds for clinical significance of obesity‑related disease are determined by practitioner review and guideline context

Biliopancreatic diversion (BPD) — Procedural definition

Biliopancreatic diversion (BPD) — core definitionProcedure involving subtotal (distal) gastrectomy and diversion of biliopancreatic juices into distal ileum creating a short common tract to induce selective malabsorption

Anatomic limb exampleTypical description includes ~200 cm alimentary limb and a 50–100 cm common tract (degree of malabsorption varies with limb lengths)

Metabolic/nutritional risksAssociated with iron deficiency, protein malnutrition, hypocalcemia, bone demineralization, and potential liver complications

Duodenal switch — Definition as BPD variant preserving pylorus

Duodenal switch — definitionVariant of BPD that includes a sleeve gastrectomy preserving the pylorus with anastomosis of duodenum to ileum to produce selective malabsorption

Intended physiologic effectPreservation of pylorus aims to reduce dumping syndrome and duodenal ulcer risk compared with classic BPD

CPT code referenceDuodenal switch described by CPT code 43845

Vertical‑banded gastroplasty (VBG) — Definition and historical note

Vertical‑banded gastroplasty (VBG) — definitionRestrictive procedure that segments the stomach and places a prosthetic collar to create a small pouch and stoma (CPT 43842)

Historical noteOnce common in the US but largely replaced due to high long‑term rates of revision and reoperation (up to ~50% at 10 years)

Complications leading to revisionStaple‑line disruption, band erosion/disruption, stoma dilation, perforation, and stenosis

Long‑limb Roux‑en‑Y gastric bypass — Definition and limb‑length relevance

Long‑limb Roux‑en‑Y gastric bypass — definitionGastric bypass variant with alimentary or common limb lengths >150 cm combining restriction and malabsorption

CPT code distinctionCPT 43846 explicitly describes short‑limb (<150 cm) RYGB and therefore does not apply to long‑limb variants

Clinical relevanceLimb length selection influences degree of malabsorption and nutritional risk

Severe obesity (adolescents) — Adolescent BMI class definitions

Adolescent severe obesity — Class 2BMI ≥ 35 kg/m2 OR ≥120% of the 95th percentile for age/sex (whichever is lower) — often requires comorbidity for indication

Adolescent severe obesity — Class 3BMI ≥ 40 kg/m2 OR ≥140% of the 95th percentile for age/sex (whichever is lower)

Evaluation considerationsAdolescents require multidisciplinary assessment including psychosocial evaluation and nutritional screening

MBS indication (adults) — Society guideline summary for adult indications

Society summary for adult MBS indicationMany societies recommend MBS for adults with BMI ≥35 kg/m2 and consider it for BMI 30–34.9 kg/m2 with type 2 diabetes; some recommend BMI ≥35 kg/m2 regardless of comorbidities

Ethnicity considerationSocieties note lower BMI thresholds for Asian populations (clinical obesity at BMI ≥25 kg/m2)

Multidisciplinary assessmentGuidelines emphasize multidisciplinary evaluation and individualized risk assessment prior to MBS

Adolescent BMI thresholds — ASMBS adolescent indication thresholds

ASMBS adolescent indication thresholdsConsider MBS for adolescents with BMI >120% of the 95th percentile with major comorbidity OR >140% of the 95th percentile without comorbidity

Multidisciplinary center evaluationASMBS recommends evaluation at specialty centers with a multidisciplinary team prior to surgery

Preoperative weight attemptsASMBS states number of prior weight‑loss attempts should not be a barrier to surgery; compliance may improve outcomes

EGD — Definition and role in pre/postoperative assessment

EGD — definitionEsophagogastroduodenoscopy (EGD) is endoscopic evaluation of the upper GI tract to detect contraindicating or surgically relevant pathology preoperatively

Role preop and postopUseful to identify hiatal hernia, peptic ulcer, H. pylori, malignancy; informs procedure choice and postoperative symptom evaluation

Routine preop utilitySystematic reviews show only ~20% of preop EGDs alter management; routine use is not universally supported

Revisional bariatric surgery — Definition and common conversions

Revisional bariatric surgery — definitionProcedures converting or revising a prior bariatric operation (e.g., sleeve→RYGB, OAGB conversions, band removal/replacement) to address complications or inadequate weight loss

Common conversionsExamples include sleeve gastrectomy to Roux‑en‑Y gastric bypass and one‑anastomosis conversions as described in systematic reviews

Indications includeComplications (erosion, obstruction), persistent GERD, or inadequate weight loss meeting policy thresholds

Pediatric/adolescent bariatric surgery — Definition note about distinct recommendations

Pediatric/adolescent bariatric surgery — definition noteSurgical weight‑loss procedures performed in children/adolescents with severe obesity; guidelines and evidence for this population differ from adults and require specialized multidisciplinary care

Age considerationsAAP recommends referral for adolescents ≥13 years with severe obesity for evaluation at pediatric MBS centers

Distinct recommendationsEndocrine Society and ASMBS provide pediatric‑specific prerequisites and guidance that differ from adult criteria

Inadequate weight loss (reoperation criterion) — Failure thresholds

Inadequate weight loss (reoperation) — EBW criterionFailure to lose at least 50% of excess body weight (EBW) meets the policy definition of inadequate weight loss for reoperation

Inadequate weight loss (reoperation) — TWL criterionFailure to achieve at least 20% total weight loss (TWL) is an alternative criterion

Contextual requirementReoperation criteria also require prior surgery ≥2 years earlier and documentation of postoperative compliance (noncompliance excludes coverage)

Physician‑administered weight loss program — Definition and 3‑month requirement

Physician‑administered weight loss program — durationProgram participation required for at least 3 continuous months (90 days) within the 12 months prior to surgery

Acceptable program evidenceDocumentation may include clinic records of weight, current dietary program, and exercise, or participation in structured programs under physician supervision

Purpose of requirementUsed as part of preoperative selection documentation; surgeon summary alone is insufficient

Policy revised to include the LAP-BAND gastric restrictive procedure as medically necessary.

2006-06-09Code update

Code 44.99 was added to the policy's coding updates.

2006-10-10Policy revision

Policy updated to indicate that routine liver biopsy during morbid obesity surgery was considered not medically necessary and clinical criteria regarding liver biopsy were added to policy guidelines.

Note

Policy revision effective 2025‑11‑07 — material changes summary

Policy header revised effective November 7, 2025; notable material changes include adding an Asian BMI threshold, reoperation criterion for inadequate weight loss, and reducing required physician‑administered program duration from six to three months.

Effective date: November 7, 2025 (after 90‑day provider notification).
Reoperation inadequate weight loss defined as failure to lose ≥50% excess body weight or failure to achieve ≥20% total weight loss.