Bariatric Surgery — SADI-S and Other Procedures Coverage Criteria
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Defines medical necessity, coverage stance, and prior authorization requirements for single anastomosis duodeno-ileal bypass with sleeve gastrectomy (SADI-S) and lists bariatric procedures considered not covered or not medically necessary for Medicare Advantage and Commercial products.
No material clinical or coverage changes in this revision.
Coverage and Medical Necessity
SADI-S Revision Criteria
Revision procedures considered medically necessary when specific complications or failure are present:
Revision for gastric pouch dilation is medically necessary if the initial procedure produced weight loss prior to dilation and the individual was compliant with prescribed nutrition and exercise; revision for severe reflux refractory to medical treatment is also medically necessary.
Bariatric surgery for BMI <35 kg/m2
Bariatric surgery in patients with BMI <35 kg/m2
Insufficient evidence to demonstrate improved health outcomes in patients without diabetes; not standard practice.
Laparoscopic gastric plication
Laparoscopic gastric plication
Technique is not standardized; evidence insufficient to determine net health outcome.
Endoscopic revision devices (e.g., StomaphyX, suturing devices)
Endoscopic revisional procedures and devices
Some devices (e.g., StomaphyX) had 510(k) clearance, but RCTs failed to meet primary endpoints or were stopped early; most devices are no longer commercially available.
Intragastric balloons
Intragastric balloons
Providers are encouraged to monitor patients closely due to safety signals and need for additional long-term data.
Aspiration therapy
Aspiration therapy
Insufficient evidence to conclude long-term net health benefit.
Preadolescent bariatric surgery
Preadolescent bariatric surgery
Further research is required before routine use in preadolescents can be recommended.
Other procedures (biliopancreatic bypass, etc.)
Other bariatric procedures
Insufficient data to determine net health outcomes; careful consideration of complication and nutritional risk is required.
The policy identifies certain bariatric procedures that are considered not covered for Medicare Advantage or not medically necessary for Commercial Products when the applicable medical criteria are not met. For Medicare Advantage Plans, examples include open adjustable gastric banding, open sleeve gastrectomy, open and laparoscopic vertical banding gastroplasty, gastric balloon for treatment of obesity, and intestinal bypass. For Commercial Products, procedures designated as not medically necessary include vertical-banded gastroplasty, mini-gastric bypass (Billroth II type), biliopancreatic bypass without duodenal switch, and long-limb gastric bypass (>150 cm). Additionally, a subset of endoscopic procedures is listed as not medically necessary for Commercial Products (see related blocks).
The SADI-S procedure for preadolescent individuals (<13 years) with obesity is explicitly stated as not covered for Medicare Advantage Plans and not medically necessary for Commercial Products due to insufficient evidence to determine health outcomes in this age group.
For Medicare Advantage Plans only, and consistent with Centers for Medicare & Medicaid Services determinations, the policy lists specific open procedures as not covered because evidence is insufficient to determine net health benefit. These include open adjustable gastric banding, open sleeve gastrectomy, open and laparoscopic vertical banding gastroplasty, gastric balloon for treatment of obesity, and intestinal bypass.
Services determined to be not medically necessary or otherwise non-covered benefits are excluded from payment and may be denied. Providers should verify member-specific benefits and eligibility with the provider call center because subscriber agreements and employer contracts supersede this policy.
The policy specifically lists several endoscopic procedures as not medically necessary when used as primary bariatric procedures or as revisional treatments for weight regain. These include insertion of the StomaphyX™ device, endoscopic gastroplasty, endoscopically placed duodenojejunal sleeve, intragastric balloons, aspiration therapy devices, and esophagogastroduodenoscopy with volume adjustment of an intragastric bariatric balloon.
The policy identifies specific CPT codes that are not covered for Medicare Advantage Plans and/or not medically necessary for Commercial Products in certain contexts. Examples called out include 43290, 43842, 43843 (not covered/not medically necessary) and 43847 when used for long-limb gastric bypass (>150 cm) for Commercial Products. Unlisted procedure codes are referenced for filing procedures lacking specific CPT codes.
If services are determined to be not medically necessary or are non-covered benefits, providers may not charge the member unless the member provided prior written agreement in advance to pay out-of-pocket. Failure to follow this requirement may result in denials and is governed by participation agreements and subscriber/employer contracts.
Coding and Definitions
| 43847 | Long-limb Roux-en-Y gastroenterostomy (gastric bypass) — referenced in policy for PA and procedure description |
| 43846 | Roux-en-Y gastroenterostomy (short limb) — noted as distinct from mini-gastric bypass and long-limb procedures |
| 43843 | Gastric restrictive procedure, without gastric bypass; other than vertical-banded gastroplasty (used for laparoscopic gastric plication) |
| 43659 | Unlisted laparoscopy procedure, stomach |
| 43999 | Unlisted procedure, stomach |
| 44799 | Unlisted procedure, small intestine |
| 44238 | Unlisted laparoscopy procedure, intestine (except rectum) |
| 43848 | Revision, open, of gastric restrictive procedure for morbid obesity, other than adjustable gastric restrictive device (separate procedure) |
| 43290 | Esophagogastroduodenoscopy, flexible, transoral; with deployment of intragastric bariatric balloon |
| 43842 | Gastric restrictive procedure, without gastric bypass, for morbid obesity; vertical-banded gastroplasty |
| 43843 | Gastric restrictive procedure, without gastric bypass, for morbid obesity; other than vertical-banded gastroplasty |
| 43847 | Gastric restrictive procedure, with gastric bypass for morbid obesity; with small intestine reconstruction to limit absorption |
| S2083 | Adjustment of gastric band diameter via subcutaneous port by injection or aspiration of saline (HCPCS) - not separately reimbursed |
| 43847 | Gastric restrictive procedure, with gastric bypass for morbid obesity; with small intestine reconstruction to limit absorption |
Provider Steps, Authorization, and Documentation
Prior Authorization Required
Prior authorization is required for Medicare Advantage Plans and is recommended for Commercial Products for Single Anastomosis Duodeno-ileal Bypass with Sleeve Gastrectomy (SADI-S). Prior authorization is required for Medicare Advantage Plans and is recommended for Commercial Products for CPT code 43847. Providers should confirm member-specific coverage, eligibility, and prior authorization requirements by contacting the BCBSRI provider call center before scheduling services.
Use of Unlisted CPT Codes for SADI-S and Other Unlisted Procedures
There is no specific CPT code for the SADI-S procedure. Claims should be filed using an appropriate unlisted CPT code when no specific code exists. Use one of the following as applicable: 43659, 43999, or 44799. When filing unlisted procedure codes, include sufficient operative documentation and rationale for code selection to support medical necessity and to facilitate claim review.
Coverage Dependent on Meeting Criteria
Coverage for SADI-S is dependent on meeting the published medical necessity criteria. The procedure is considered medically necessary only when all required criteria (e.g., BMI thresholds, failed conservative measures, tobacco/substance-free intervals, psychosocial and dietary evaluations, pregnancy considerations, and surgeon/institutional qualifications) are documented. SADI-S is not covered for Medicare Advantage Plans and is not medically necessary for Commercial Products when the medical criteria are not met.
- Procedure considered medically necessary only when ALL policy criteria are met (see medical criteria list)
- Not covered/not medically necessary if documentation does not meet criteria
Required Documentation to Support Medical Necessity
Providers must submit documentation to support medical necessity with prior authorization and with claims. Required documentation includes, but is not limited to: thorough weight history and BMI calculations, records of failed conservative measures including participation in a formal weight reduction program with documented weight, diet, and exercise, psychosocial evaluation and clearance, dietary consultation notes, tobacco-free and substance/alcohol-free documentation with specified durations, informed consent discussion, and surgeon/institutional credentials or program participation.
- Document BMI and qualifying obesity class and/or presence of type 2 diabetes when applicable
- Provide records of formal weight reduction program participation and outcomes
- Include psychosocial evaluation and behavioral health clearance
- Document tobacco-free ≥ 6 weeks and substance/alcohol-free ≥ 1 year where applicable
- Include dietary consultation and informed consent documentation
- Provide surgeon training/experience and evidence of comprehensive bariatric program
EGD Documentation That Changes Surgical Planning
Esophagogastroduodenoscopy (EGD) findings that alter operative management or postpone surgery should be clearly documented and submitted. While routine preoperative EGD may not change management in the majority of patients, if EGD identifies conditions that contraindicate or change the planned bariatric procedure (e.g., malignancy, large hiatal hernia, peptic ulcer, H. pylori), include the EGD report and explanation of how findings affected surgical planning.
- Attach EGD report when findings change surgical plan or delay surgery
- Specify how EGD findings impacted the choice or timing of procedure
No Specified Step Therapy
No specific step therapy sequence is required by this policy. However, the policy emphasizes that members must have failed conservative measures including participation in a formal weight reduction program prior to qualifying for SADI-S.
- No explicit step therapy requirements stated
- Conservative therapy failure (formal weight reduction program) is required
Claims Using Specific CPT/HCPCS Codes Will Be Denied for Certain Benefit Types
Claims submitted using CPT/HCPCS codes listed as not covered or not separately reimbursed will be denied for the applicable Medicare Advantage benefit types, and may be denied for Commercial Products when not medically necessary. The following CPT codes are listed as not covered/not medically necessary and will be denied if used for the excluded indications: 43290, 43842, 43843, 43847 (when used for long-limb gastric bypass >150 cm for Commercial Products listed as not medically necessary). The HCPCS code S2083 is not separately reimbursed. Providers should not bill members for services denied as not medically necessary or non-covered except where allowed and documented in advance per participation agreements.
Clinical and Evidence Context
Bariatric surgery is a treatment for obesity reserved for patients who have failed conservative measures; techniques reduce caloric intake or absorption and may have metabolic effects. SADI-S combines sleeve gastrectomy with a single anastomosis duodeno-ileal bypass and has been evaluated as an alternative to Roux-en-Y, with randomized data demonstrating greater percentage excess weight loss at 2 years in a trial of 381 patients, while overall safety profiles were comparable. Overall, selection of surgical approach depends on patient factors, prior treatments, and evidence supporting long-term outcomes.
Procedure Definitions
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