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Site of Service Ambulatory Surgical Center (ASC) Select — Site of Service for Ambulatory Surgical Procedures (ASC Select)
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Guideline for medical necessity review and prior authorization of the site of service for certain elective ambulatory surgical and diagnostic procedures in adults, specifying when procedures should be performed in an Ambulatory Surgical Center versus hospital outpatient or inpatient settings.
Title changed to include diagnostic procedures and site-of-service review expanded to additional procedures (e.g., Upper Gastrointestinal (UGI) Endoscopy, implantable loop recorder surgery, hand surgery and shoulder arthroscopy) with associated CPT/HCPCS codes.
ASA Physical Status Classification table updated to include adult examples and abbreviations defined.
Disclaimer and scope statements clarify the policy is a guideline, may be updated, and does not apply to Medicare Advantage.
Clarification that site-of-service review does not apply to Indian Health Services (IHS) facilities.
Site-of-Service Coverage Criteria
Site of Service Medical Necessity Criteria
Covered when ALL of the following are met:
Hospital site may be medically necessary when ANY of the following apply
- No qualifying ASC within 30 miles that can provide the necessary equipment or is available
- The ASC's specific guideline prohibits use of the ASC for the individual (for example, guideline weight or condition exclusion)
- Individual is aged 18 years or younger
- The service is being performed in conjunction with an additional service that requires use of a hospital outpatient department during the same operative session
- The individual has clinical conditions that increase risk for complications (see clinical risk criteria)
Clinical risk criteria (one or more of the following may necessitate hospital site)
- Anesthesia risk: ASA classification III or higher; personal history of anesthesia complication; documentation of alcohol dependence or history of cocaine use; prolonged surgery (>3 hours)
- Cardiovascular risk: uncompensated chronic heart failure (NYHA class III–IV); recent MI (<3 months); poorly controlled/resistant hypertension (eg, 3 or more drugs to control BP); recent cerebrovascular accident (<3 months); increased risk for cardiac ischemia (drug-eluting stent <1 year or angioplasty <90 days); symptomatic arrhythmia despite medication; significant valvular heart disease
- Liver risk: advanced liver disease (MELD score >8)
- Pulmonary risk: COPD with reduced FEV1; poorly controlled asthma (FEV1 <80% despite treatment); moderate to severe OSA (AHI ≥15)
- Renal risk: end-stage renal disease on dialysis
- Other: morbid obesity (BMI ≥50); pregnancy; bleeding disorder requiring replacement products or anticipated need for transfusion(s) (DDAVP alone does not meet this criterion)
Medical necessity / site-of-service criteria
Site of Service ASC for Select Surgical or Diagnostic Procedures will be considered medically necessary when specified criteria are met; additions and effective date changes are noted in policy history.
Operational notes
- Site-of-service review does not apply to Indian Health Services (IHS) facilities
- Consult related procedure-specific policies referenced in the history and 'Related Policies' section for medical necessity criteria specific to individual procedures
Examples and Coding Details
| 19318 | Reduction mammaplasty (example listed under breast surgery) |
| 31233 | Nasal endoscopy, diagnostic (example ENT codes listed) |
| 43235 | Esophagogastroduodenoscopy, diagnostic (example GI codes listed) |
| 29871 | Knee arthroscopy for infection, lavage and drainage (example knee codes listed) |
| 29806 | Shoulder arthroscopy diagnostic (example shoulder codes listed) |
| 33285 | Insertion of cardiac implantable loop recorder |
| E0616 | External mobile cardiac telemetry (HCPCS) referenced |
| 29805-29807, 29819-29828, 23700 | Shoulder arthroscopy and related codes added (ranges listed in history) |
| 29848 | Endoscopy, wrist, surgical, with release of transverse carpal ligament (hand surgery) |
| 64721 | Neuroplasty and/or transposition; median nerve at carpal tunnel (hand surgery) |
Requirements for Providers
Prior authorization required for site-of-service selection
Prior authorization is required for the site of service for the surgical procedures listed; the guideline will be used to review site-of-service medical necessity for elective surgeries.
- Providers must obtain prior authorization specifically for site-of-service selection for the listed elective procedures.
- The policy guideline will be applied during utilization management review to determine the medically necessary site of service.
When ASC is considered medically necessary and review process
Site-of-service review determines when Ambulatory Surgical Center (ASC) is the preferred medically necessary site for select elective surgical or diagnostic procedures; the ASC is preferred when the criteria in this guideline are met, and additions to the list of procedures and codes are subject to review per the policy history.
- ASC is the preferred medically necessary site when the policy criteria are satisfied.
- A hospital outpatient department may be considered necessary if no qualifying ASC is geographically accessible within 30 miles or if clinical exceptions apply.
- Procedure and code additions (e.g., shoulder arthroscopy, implantable loop recorder, hand surgery, UGI endoscopy) have been added over time and are reviewed per policy history.
IHS facilities exempt from site-of-service review
Site-of-service review and related prior authorization requirements do not apply to Indian Health Services (IHS) facilities.
- The policy header was updated to indicate the exemption for IHS facilities on 06/16/26.
Key Clinical and Billing Definitions
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