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Site of Service Ambulatory Surgical Center (ASC) Select — Surgical or Diagnostic Procedures in Adults
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Defines medical necessity review and preferred site-of-service (including ASC, on-/off-campus outpatient hospital) for certain elective surgical or diagnostic procedures in adults and requirements for prior authorization of site of service.
Title expanded to include diagnostic procedures and Site of Service review was updated to 'Select Surgical or Diagnostic Procedures in Adults'.
Added new Cardiac Surgery section including implantable loop recorder surgery and CPT/HCPCS codes (33285, E0616).
Added Hand Surgery section to include carpal tunnel release surgical techniques and CPT codes 29848 and 64721.
Policy does not apply to Indian Health Services (IHS) facilities.
Updated ASA Physical Status Classification table to include adult examples.
Medical Necessity and Site-of-Service Criteria
Medical necessity site-of-service criteria
Site-of-service medical necessity criteria determine whether an elective procedure should be performed in an ambulatory surgical center (preferred) or in a hospital outpatient/inpatient setting. Covered as medically necessary in an ASC when ALL of the following apply unless a hospital site is justified by the criteria below:
ALL of the following
- Preferred site: Procedure is one of the elective surgical procedures listed in this policy and an ASC is clinically appropriate and available
- No contraindication to ASC use based on clinical or operational criteria (see exclusions below)
- Prior authorization for site of service has been obtained when required
- A qualifying ASC is geographically accessible within 30 miles and has necessary equipment and availability
Hospital outpatient or inpatient site may be considered medically necessary when ANY of the following criteria are met:
- There is no qualifying ASC within 30 miles that can provide the necessary care due to lack of equipment or availability
- An ASC's specific guideline or capability prohibits use for this individual due to health condition or weight
- The individual is aged 18 or younger
- The service is performed in conjunction with an additional service that requires a hospital outpatient department and both are performed in the same operative session
- The individual has a clinical condition that increases risk for complications, including but not limited to anesthesia, cardiovascular, liver, pulmonary, renal, or other high-risk conditions (see subcriteria)
High-risk clinical conditions (examples; presence of ANY may justify hospital site):
- Anesthesia risk: ASA classification III or higher, personal history of anesthesia complication, documented alcohol dependence or history of cocaine use, or prolonged surgery (> 3 hours)
- Cardiovascular risk: uncompensated chronic heart failure (NYHA class III or IV), recent MI (< 3 months), poorly controlled/resistant hypertension (eg, requiring ≥3 medications), recent cerebrovascular accident (< 3 months), increased risk for cardiac ischemia (drug-eluting stent < 1 year or angioplasty < 90 days), symptomatic arrhythmia despite medication, or 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 obstructive sleep apnea (AHI ≥ 15)
- Renal risk: end-stage renal disease on dialysis
- Other: morbid obesity (BMI ≥ 50), pregnancy, bleeding disorder requiring replacement products (DDAVP alone does not meet this criterion), or anticipated need for transfusion(s)
Operational notes
- Prior authorization is required for site of service review for the surgical procedures listed in this policy
- Site of service review does not apply to Indian Health Services (IHS) facilities
Definitions referenced: ASA classification, NYHA classification, MELD score, AHI
Medical necessity and site-of-service review
Site of Service for ASC Select Surgical or Diagnostic Procedures will be considered medically necessary when the policy's criteria are met. The policy list of procedures and codes has been expanded; additions require review for ASC site-of-service medical necessity.
ALL of the following
- The procedure is among the procedures listed in this policy (including recent additions such as Upper GI endoscopy, implantable loop recorder insertion, and carpal tunnel release techniques)
- Documentation demonstrates that the patient meets the site-of-service medical necessity criteria (see Medical necessity site-of-service criteria)
- Prior authorization for site of service has been submitted and approved per policy requirements
Recent additions requiring ASC site-of-service review
- Upper Gastrointestinal (UGI) Endoscopy added to list effective March 4, 2026 (see history)
History and effective dates
- Policy title and scope expanded to include diagnostic procedures effective March 4, 2026 with provider notification periods noted in history
- Subsequent interim updates added codes for shoulder arthroscopy and other procedures with specified effective dates; consult policy history for exact dates
Operational note: additions and effective dates are detailed in the policy history and require adherence to provider notification periods; site-of-service review exclusions (IHS) apply
Example and Added Procedure Codes
| 19318 | Reduction mammaplasty |
| 30400-30450 | Rhinoplasty series |
| 31233-31288,31296-31298 | Nasal/sinus endoscopy and surgical codes |
| 43235-43242 | Upper GI endoscopy series |
| 29871-29889 | Knee arthroscopy series |
| 63650-63688 | Spinal cord/DGR stimulation and related neurostimulator codes |
| 33285 | Implantable loop recorder insertion |
| E0616 | External cardiac telemetry monitoring device (HCPCS) |
| 29848 | Arthroscopic carpal tunnel release (CPT) |
| 64721 | Neuroplasty and/or transposition; median nerve at carpal tunnel |
| 23700 | Manipulation under anesthesia, shoulder joint |
| 29805-29807 | Shoulder arthroscopy series |
| 29819-29828 | Additional shoulder arthroscopy codes |
Prior Authorization and Site-of-Service Requirements
Obtain prior authorization for site of service
Prior authorization is required for the site of service for the surgical procedures listed; the policy will review site of service for medical necessity for certain elective surgical procedures.
- Providers must obtain prior authorization when submitting site-of-service requests for the procedures listed in this policy.
- The policy reviews whether the elective procedure should be performed in an ASC (preferred) or a hospital outpatient/inpatient setting based on medical necessity.
ASC site-of-service review required for listed procedures
Site of Service for ASC Select Surgical or Diagnostic Procedures will be considered medically necessary when the policy's criteria are met; additions to the list of procedures (e.g., shoulder arthroscopy, UGI endoscopy, cardiac and hand surgery codes) require review for ASC site of service.
- ASC is the preferred medically necessary site when criteria are met; hospital outpatient may be considered if no qualifying ASC is accessible within 30 miles or other listed exceptions apply.
- Recent additions requiring review include shoulder arthroscopy (codes added effective 02/06/26), UGI endoscopy (added effective 03/04/26), implantable loop recorder and related cardiac codes (added effective 04/08/26), and hand surgery codes (added effective 06/05/26).
IHS facilities excluded from site-of-service review
Site of service review does not apply to Indian Health Services (IHS) facilities; the policy header explicitly excludes IHS facilities.
- Do not submit site-of-service ASC review requests for procedures performed at IHS facilities under this policy.
Key Definitions and Classification Systems
Policy Changes and Effective Dates
Added Cardiac Surgery section including implantable loop recorder insertion and added CPT code 33285 and HCPCS code E0616 to the policy.
Title changed to include diagnostic procedures (now 'Select Surgical or Diagnostic Procedures in Adults') and Upper Gastrointestinal (UGI) Endoscopy (policy 2.01.533) was added to procedures requiring ASC site-of-service review.
Added shoulder arthroscopy and CPT codes 23700, 29805-29807, 29819-29828 to procedures considered medically necessary in ASCs when criteria are met.
New Utilization Management Guideline approved July 8, 2025; Site of Service for ASC Select Surgical Procedures will be considered medically necessary when criteria are met, effective November 7, 2025 following 90-day provider notification.
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