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 appropriate site of service (ASC, outpatient hospital, inpatient) for selected elective surgical and diagnostic procedures in adults; intended for providers and applies to Premera-covered members (Indian Health Services exceptions noted).
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 Upper Gastrointestinal (UGI) Endoscopy in Adults (policy 2.01.533) to the list of procedures requiring site-of-service ASC review.
Added Cardiac Surgery section to include implantable loop recorder surgery with CPT 33285 and HCPCS E0616.
Added Hand Surgery section to include carpal tunnel release surgical techniques and added CPTs 29848 and 64721.
Minor update to ASA Physical Status Classification table to include adult examples.
Site-of-service review does not apply to Indian Health Services (IHS) facilities.
Site-of-Service Coverage Criteria
Site of Service Medical Necessity Criteria
Site of service for elective surgical procedures is evaluated and determined medically necessary according to the following hierarchical logic:
Top-level site preference
- When ASC not appropriate -> hospital outpatient may be considered: An elective surgical procedure performed in a hospital outpatient department may be considered medically necessary if any of the following are present: no qualifying ASC within 30 miles that can provide the necessary care; no geographically accessible ASC with required equipment; no geographically accessible ASC at which the individual's physician has privileges; the ASC's specific guideline prohibits use for the individual's health condition or weight; the individual is aged 18 years or younger; the service is being performed in conjunction with an additional service that requires a hospital outpatient department in the same operative session; or the individual has a clinical condition that places them at increased risk for complications.30 miles
Any one of these conditions suffices to justify hospital outpatient site.
This list may not be exhaustive; presence of any listed condition supports selection of a hospital-based site.
ASC Coverage with Criteria
ASC is considered medically necessary for select surgical or diagnostic procedures when documented criteria are met and the procedure is included in the list of approved codes.
Full, procedure-specific criteria are defined in the referenced policies (for example: 2.01.533, 2.02.510, 7.01.595); providers must request site-of-service review/authorization when performing listed CPT/HCPCS codes in an ASC.
The Site of Service Medical Necessity criteria in this guideline DOES NOT apply to Indian Health Services (IHS) facilities. For procedures performed at IHS facilities, follow the procedure-specific medical necessity criteria rather than the site-of-service rules in this policy.
Site-of-service review and the ASC-preference determinations described in this guideline do not apply to Indian Health Services (IHS) facilities. This header exemption was added in policy history; providers performing services at IHS sites should refer to the procedure-specific medical necessity criteria.
When the ASC-preference criteria are not met, an off‑campus or on‑campus hospital outpatient department or an inpatient hospital site may be considered appropriate. Conversely, these hospital outpatient or inpatient sites are considered not medically necessary for the listed elective surgical procedures when the ASC criteria and the justifications for hospital-based care are not present.
Services performed in an Ambulatory Surgical Center (ASC) that do not meet the policy's specified ASC clinical criteria for the listed procedures may be considered not medically necessary. Providers must ensure the procedure is one of the select procedures covered for ASC care and that documented ASC criteria are met when scheduling and requesting authorization for ASC site-of-service.
CPT / HCPCS Codes and Coding Considerations
| 43235 | Esophagogastroduodenoscopy, flexible, transoral; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure). |
| 43238 | Esophagogastroduodenoscopy, flexible, transoral; with transendoscopic ultrasoundguided intramural or transmural fine needle aspiration/biopsy(s). |
| 43239 | Esophagogastroduodenoscopy, flexible, transoral; with biopsy, single or multiple. |
| 43242 | Esophagogastroduodenoscopy, flexible, transoral; with transendoscopic ultrasoundguided intramural or transmural fine needle aspiration/biopsy(s) (includes endoscopic ultrasound examination of the esophagus, stomach, and either the duodenum or a surgically altered stomach where the jejunum is examined distal to the anastomosis). |
| 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). |
| 31295 | Nasal/sinus endoscopy, surgical, with dilation (e.g., balloon dilation); maxillary sinus ostium, transnasal or via canine fossa. |
| 27415 | Osteochondral allograft, knee, open. |
| 27416 | Osteochondral autograft(s), knee, open (e.g., mosaicplasty) (includes harvesting of autograft[s]). |
| 29871 | Arthroscopy, knee, surgical; for infection, lavage and drainage. |
| 29880 | Arthroscopy, knee, surgical; with meniscectomy (medial AND lateral, including any meniscal shaving) including debridement/shaving of articular cartilage (chondroplasty)... |
| 23700 | CPT code added per history |
| 29805 | CPT code added per history |
| 29806 | CPT code added per history |
| 29807 | CPT code added per history |
| 29819 | CPT code added per history |
| 29820 | CPT code added per history |
| 29821 | CPT code added per history |
| 29822 | CPT code added per history |
| 29823 | CPT code added per history |
| 29824 | CPT code added per history |
Prior Authorization, Documentation, and Denial Triggers
Prior Authorization Required for Site of Service
Prior authorization is required for site-of-service selection for the listed elective procedures. Providers must request an ASC site-of-service review for the select CPT/HCPCS codes and procedures identified in the policy prior to performing the service in an ASC.
- Provider must obtain prior authorization for site selection for listed elective procedures.
- Providers must request ASC site-of-service review for select procedures/CPT/HCPCS codes before scheduling when policy criteria may apply.
Site-of-Service ASC Review Required for Listed Codes
Providers must request a Site-of-Service ASC review for the specific CPT/HCPCS codes added to the policy. Services provided in an ASC for these listed procedures may be subject to denial if the ASC criteria in the policy are not met.
- Policy changes added specific CPT/HCPCS codes requiring ASC review (examples in history include CPT 33285, HCPCS E0616, CPT 29848, CPT 64721, CPTs 29805-29807, 29819-29828, 23700).
- If ASC criteria are not met for a listed procedure, services performed in an ASC may be denied as not medically necessary.
- Providers should verify ASC criteria and obtain required review before performing listed procedures in an ASC.
Documentation Requirements for Non-ASC Site
When an elective procedure is performed in a non-preferred site (for example, outpatient hospital rather than ASC) providers must document the clinical rationale supporting the non-ASC site selection. Documentation should include supporting evidence demonstrating why ASC is not appropriate or available (e.g., lack of geographically accessible ASC with necessary equipment or physician privileges, patient-specific clinical risk factors, age, concurrent services requiring hospital setting).
- Document lack of geographically accessible ASC within 30 miles that can provide necessary care or where the physician has privileges.
- Document ASC-specific guideline exclusions (e.g., weight or health condition), patient age (≤18), concurrent services requiring hospital outpatient department, or clinical conditions placing the patient at increased risk (examples: ASA class III+, recent MI, advanced liver disease, significant cardiac or pulmonary risks).
- Include any relevant objective data (labs, imaging, consultation notes) that support need for non-ASC setting.
Policy Changes Reference Specific CPT/HCPCS Codes — Review Required
Policy updates reference and add specific CPT and HCPCS codes that require ASC Site-of-Service review. Providers must review the policy history and ensure authorization requests include the applicable codes.
- Recent additions in policy history include CPT 33285 and HCPCS E0616 (Cardiac/implantable loop recorder), CPTs added for shoulder arthroscopy and other procedures (e.g., 23700, 29805-29807, 29819-29828), and hand surgery codes such as 29848 and 64721.
- Providers should confirm the current policy list for all CPT/HCPCS codes that require ASC review prior to scheduling.
Site-of-Service Denial Triggers and ASC Denial Risk
Services provided in an ASC for listed procedures may be denied when the policy's ASC criteria are not met. Providers should obtain required prior authorization and ensure documentation supports ASC use; otherwise claims may be denied as not medically necessary for the ASC site-of-service.
- Denial or 'not medically necessary' determination may be applied to outpatient hospital or inpatient sites when ASC criteria are met and the service was performed outside the preferred site without justification.
- Providers should request ASC site-of-service review and include clinical documentation to avoid denials.
- Site-of-service determinations will be applied per the policy; follow-up appeals should reference the documented clinical rationale and policy criteria.
Background and Scope
Elective surgical procedures can be performed safely in multiple settings. When clinically appropriate and available, an Ambulatory Surgical Center (ASC) is the preferred site for many elective surgical and diagnostic procedures because ASCs support efficient, safe, and cost‑effective care. Patient-specific clinical risks and procedure complexity should guide selection of an ASC versus hospital outpatient or inpatient sites.
Definitions and Clinical Classifications
Policy Changes and Revision History
Added header noting that site-of-service review does not apply to Indian Health Services (IHS) facilities.
Policy effective date for UGI Endoscopy (2.01.533) updated from May 1, 2026 to July 1, 2026 due to operational readiness.
Interim review entry recorded in policy history (March 1, 2026).
Minor clarification made to the policy history section.
Added Cardiac Surgery section to include implantable loop recorder surgery and added CPT 33285 and HCPCS E0616; added policy 2.02.510 to related policies.
Title changed to include diagnostic procedures and added UGI Endoscopy (2.01.533) to procedures requiring ASC site-of-service review; ASA table minor update to include adult examples (effective March 4, 2026).
New utilization management guideline approved July 8, 2025 became effective for dates of service on or after November 7, 2025 establishing ASC site-of-service criteria for select procedures.
Interim review added shoulder arthroscopy to ASC list and added CPT codes 23700 and 29805-29807, 29819-29828 effective February 6, 2026.
Added Hand Surgery section for carpal tunnel release techniques and added CPT codes 29848 and 64721 (effective June 5, 2026 following provider notification).
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