Site of Service Ambulatory Service Center Select Surgical or Diagnostic Procedures in Adults
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Defines medical necessity criteria and prior authorization expectations for the site of service (ASC, hospital outpatient departments, inpatient) for certain elective surgical procedures for Premera members.
This policy has been revised.
Title changed from 'Site of Service Ambulatory Service Center Select Surgical Procedures in Adults' to 'Site of Service Ambulatory Service Center Select Surgical or Diagnostic Procedures in Adults'.
Added 2.01.533 Upper Gastrointestinal (UGI) Endoscopy in Adults to the list of procedures that require review for Site of Service ASC for Select Surgical or Diagnostic Procedures.
Added new Cardiac Surgery section to include implantable loop recorder surgery; added CPT code 33285 and HCPCS code E0616 and policy 2.02.510 Mobile Cardiac Outpatient Telemetry and Implantable Loop Recorders.
Added shoulder arthroscopy to ASC for Select Surgical Procedures and added CPT codes 23700, 29805-29807, 29819-29828.
Updated ASA Physical Status Classification table to include adult examples and expanded abbreviations.
Site-of-Service Coverage Criteria
Medically necessary site-of-service criteria
Site of Service for Elective Surgical Procedures — Medically necessary when ANY of the following are met (ASC is the preferred site; HOPD or inpatient settings may be medically necessary when one or more of the conditions below apply):
ASC is preferred when available and appropriate.
Geographic access or privilege limitations permit use of HOPD.
Pediatric status or combined procedures justify HOPD.
Clinical risk factors warranting higher-acuity site
- Anesthesia risk: ASA classification III or higher; personal history of complication of anesthesia; documentation of alcohol dependence or history of cocaine use; prolonged surgery (greater than 3 hours).> 3 hours (prolonged surgery)
See ASA definition table for examples.
- Cardiovascular risk: Uncompensated chronic heart failure (NYHA class III or IV); recent myocardial infarction (< 3 months); poorly controlled/resistant hypertension (≥ 3 drugs); recent cerebrovascular accident (< 3 months); increased risk for cardiac ischemia (drug eluting stent placed < 1 year or angioplasty < 90 days); symptomatic arrhythmia despite medication; significant valvular heart disease.
Cardiac conditions increase perioperative risk.
- Liver risk: Advanced liver disease with MELD score greater than 8.MELD > 8
- Pulmonary risk: Chronic obstructive pulmonary disease with FEV1 < 50%; poorly controlled asthma with FEV1 < 80% despite treatment; moderate to severe obstructive sleep apnea.FEV1 <50% (COPD); FEV1 <80% despite treatment (asthma)
- Renal risk: End stage renal disease on dialysis.
- Bleeding or transfusion risk: Bleeding disorder requiring replacement factor, blood products, or special infusion product (note: DDAVP does not meet this criterion); anticipated need for transfusion(s).
- Other: Morbid obesity with BMI greater than or equal to 50.BMI ≥ 50
Not medically necessary site-of-service
ASC is the preferred medically necessary site; HOPD/inpatient are not medically necessary in the absence of access, age/concurrent procedure, or specified clinical risk criteria.
ASC Site-of-Service Medical Necessity — scope and updates
Policy scope and criteria updates (history entries) — ASC site-of-service will be considered medically necessary when procedure-specific criteria are met and required site-of-service review/authorization is completed.
See individual procedure policies (for example, 2.01.533 Upper Gastrointestinal Endoscopy in Adults and 2.02.510 Mobile Cardiac Outpatient Telemetry and Implantable Loop Recorders) for full criteria and for newly added codes requiring review.
Sites of service including off‑campus outpatient hospital/medical center, on‑campus outpatient hospital/medical center, and inpatient hospital/medical center are considered not medically necessary for the elective surgical procedures listed in this policy when the site‑of‑service criteria are not met. The policy frames the ambulatory surgical center (ASC) as the preferred site of service for listed elective procedures and requires that documented reasons satisfying the policy criteria be present to justify use of a hospital outpatient or inpatient setting.
This medical policy does not apply to Medicare Advantage members. Providers and members with Medicare Advantage coverage should follow applicable Medicare Advantage benefit rules and plan guidance rather than this policy.
Use of a hospital outpatient department or inpatient setting for the listed elective procedures may be medically necessary only when one or more of the policy’s site‑of‑service criteria are met. Those criteria include lack of an accessible ASC within 30 miles, age or concurrent procedure considerations (e.g., patient ≤18 years or a concurrent service that requires HOPD), or specific clinical risk factors such as anesthesia risk (e.g., ASA classification III or higher, personal history of anesthesia complication, prolonged surgery > 3 hours), significant cardiovascular, pulmonary, liver (e.g., MELD > 8), renal, bleeding or morbid obesity (e.g., BMI ≥ 50) risks. Absent these criteria and appropriate documentation, HOPD/inpatient use is not supported by the policy and may be denied.
Procedures that are not listed as medically necessary for ASC site of service, or procedures performed in any site without meeting the specified policy criteria, may be considered not medically necessary and therefore subject to denial. The policy requires that ASC medical necessity logic and any additions to the ASC review list (for example newly added codes in the policy history) be followed and that prior review/authorization be obtained when required.
CPT/HCPCS and Place of Service Codes
| 27415 | Osteochondral allograft, knee, open. |
| 27416 | Osteochondral autograft(s), knee, open (e.g., mosaicplasty) (includes harvesting of autograft[s]). |
| 28446 | Open osteochondral autograft, talus (includes obtaining graft[s]). |
| 29866 | Arthroscopy, knee, surgical; osteochondral autograft(s) (e.g., mosaicplasty) (includes harvesting of the autograft[s]). |
| 29867 | Arthroscopy, knee, surgical; osteochondral allograft (e.g., mosaicplasty). |
| 30400 | Rhinoplasty, primary; lateral and alar cartilages and/or elevation of nasal tip. |
| 30410 | Rhinoplasty, primary; complete, external parts including bony pyramid, lateral and alar cartilages, and/or elevation of nasal tip. |
| 30420 | Rhinoplasty, primary; including major septal repair. |
| 31233 | Nasal endoscopy, diagnostic, unilateral or bilateral (separate procedure). |
| 31235 | Nasal/sinus endoscopy, diagnostic; with sphenoid sinusoscopy. |
| 31240 | Nasal/sinus endoscopy, surgical; with concha bullosa resection. |
| 42145 | Palatopharyngoplasty (e.g., uvulopalatopharyngoplasty, uvulopharyngoplasty). |
| 29805 | Arthroscopy, shoulder, diagnostic, with or without synovial biopsy (separate procedure). |
| 29807 | Arthroscopy, shoulder, surgical; repair of SLAP lesion. |
| 29826 | Arthroscopy, shoulder, surgical; decompression of subacromial space with partial acromioplasty, with coracoacromial ligament release. |
| 29871 | Arthroscopy, knee, surgical; for infection, lavage and drainage. |
| 29873 | Arthroscopy, knee, surgical; with lateral release. |
| 29874 | Arthroscopy, knee, surgical; for removal of loose body or foreign body. |
| 29875 | Arthroscopy, knee, surgical; synovectomy, limited. |
| 29876 | Arthroscopy, knee, surgical; synovectomy, major, 2 or more compartments. |
| 29877 | Arthroscopy, knee, surgical; debridement/shaving of articular cartilage (chondroplasty). |
| 29879 | Arthroscopy, knee, surgical; abrasion arthroplasty or multiple drilling or microfracture. |
| 29880 | Arthroscopy, knee, surgical; with meniscectomy (medial AND lateral) including debridement. |
| 29881 | Arthroscopy, knee, surgical; with meniscectomy (medial OR lateral) including debridement. |
| 29882 | Arthroscopy, knee, surgical; with meniscus repair (medial OR lateral). |
| 63650 | Percutaneous implantation of neurostimulator electrode array, epidural. |
| 63655 | Laminectomy for implantation of neurostimulator electrodes, plate/paddle, epidural. |
| 63661 | Removal of spinal neurostimulator electrode percutaneous array(s), including fluoroscopy, when performed. |
| 63662 | Removal of spinal neurostimulator electrode plate/paddle(s) placed via laminotomy or laminectomy, including fluoroscopy, when performed. |
| 63663 | Revision including replacement, when performed, of spinal neurostimulator electrode percutaneous array(s), including fluoroscopy. |
| 63664 | Revision including replacement, when performed, of spinal neurostimulator electrode plate/paddle(s) placed via laminotomy or laminectomy, including fluoroscopy. |
| 63685 | Insertion or replacement of spinal neurostimulator pulse generator or receiver, direct or inductive coupling. |
| 63688 | Revision or removal of implanted spinal neurostimulator pulse generator or receiver. |
| 19 | Off-Campus-Outpatient Hospital (Place of Service) |
| 21 | Inpatient Hospital (Place of Service) |
| 22 | On Campus-Outpatient Hospital (Place of Service) |
| 24 | Ambulatory Surgical Center (Place of Service) |
| 33285 | Insertion of implantable loop recorder |
| E0616 | External symbol/code for related device (HCPCS) — associated with implantable loop recorder supplies |
| 23700 | Code added (shoulder-related) |
| 29805 | Arthroscopy, shoulder, diagnostic |
| 29806 | Arthroscopy, shoulder; distal claviculectomy including distal articular surface (Mumford procedure) |
| 29807 | Arthroscopy, shoulder; synovectomy, partial |
| 29819 | Arthroscopy, shoulder; decompression of subacromial space with partial acromioplasty, with coracoacromial ligament (space) release, when performed |
| 29820 | Arthroscopy, shoulder; ... (shoulder arthroscopy series continued) |
| 29821 | Arthroscopy, shoulder; capsulorrhaphy |
| 29822 | Arthroscopy, shoulder; ... (series) |
Provider Requirements and Operational Notes
Prior Authorization Required
Providers must obtain prior authorization when requesting an alternate site of service for elective procedures that otherwise would be performed in an ambulatory surgical center (ASC). Justification should explain why the ASC is not appropriate or available and reference the applicable medical necessity criteria in this policy.
- Prior authorization required for ASC site-of-service exceptions
- Include clinical and access-based rationale when requesting alternate site
Prior Review Required for Added ASC Procedures
Newly added CPT/HCPCS codes identified in the policy history that expand ASC-eligible procedures require prior review for ASC placement. Check the policy history and effective dates for code additions and obtain prior review when performing a listed procedure in an ASC.
- Affected codes added 02/06/26: 23700, 29805-29807, 29819-29828
- Verify current code list and effective dates before scheduling ASC cases
Documentation to Support Alternate Site
When requesting an alternate site (e.g., hospital outpatient department instead of ASC), providers must document why an ASC is not appropriate or available. Documentation should include geographic access considerations, physician privilege availability, ASC equipment limitations, and any relevant clinical risk factors (for example ASA classification III+, significant comorbidities, prolonged anticipated surgery).
- Geographic access: absence of a qualifying ASC within 30 miles or no ASC with required equipment
- Privilege availability: physician does not have privileges at geographically accessible ASC
- ASC-specific restrictions: ASC guideline or facility restriction related to patient condition or weight
- Clinical reasons: ASA class III or higher, significant cardiac/pulmonary/hepatic/renal risks, bleeding disorders, morbid obesity, or other documented increased risk
Member Benefit Verification
Before scheduling or performing a procedure, providers should verify the member's specific benefits and coverage limitations. Member contracts may vary; contact the member benefit booklet or customer service to confirm ASC coverage, prior authorization requirements, and any plan exclusions or special conditions.
- Check member benefit booklet for ASC coverage and limits
- Contact customer/member services for plan-specific prior authorization requirements
Denial Triggers for Inappropriate Site of Service
Services performed in an ASC that are not listed as medically appropriate for ASC placement or that lack required documentation/authorization may be denied. Providers should ensure the requested site of service aligns with the policy criteria and that all supporting documentation and prior reviews are in the record to avoid denial risk.
- Denial risk if ASC is used for procedures not listed as ASC-appropriate
- Denial risk if alternate site justification or prior authorization is missing
Policy Background
Certain elective surgeries can be safely performed in lower‑acuity, lower‑cost settings such as ambulatory surgical centers (ASCs). ASCs are the preferred site for many listed elective surgical and diagnostic procedures when procedure‑specific and patient‑specific criteria are met. Patients with higher perioperative risk (for example, significant cardiac, pulmonary, liver, renal, bleeding risks, ASA III or higher, or morbid obesity) or those without geographically accessible ASCs may appropriately require care in hospital outpatient departments or inpatient settings. The policy balances patient safety and clinical risk against the goal of delivering care in a lower‑cost appropriate setting and directs providers to document reasons why the ASC is not appropriate when seeking authorization for a higher‑acuity site.
Clinical Definitions and Classification Tables
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