ASC billing is a facility-fee model layered on top of whatever CPT codes the surgeon bills professionally, and most ASC denials come from a mismatch between the facility claim, the professional claim, and the place-of-service code used on each.
Why This Specialty Is Billing-Complex
An ASC bills a facility fee under its own ASC payment grouping, separate from the surgeon’s and anesthesiologist’s professional fees for the same case, and all three claims need to agree on the procedure codes, date of service, and place of service (24 for an ASC) or the claims will be flagged as inconsistent. Not every CPT code is approved for the ASC setting, so procedures have to be checked against the payer’s ASC-approved procedure list before scheduling.
Common CPT, ICD-10 & HCPCS Codes
- Place of service 24 — ambulatory surgical center
- ASC payment indicator/grouping assigned per CPT code by CMS and commercial payers
- CPT codes for the specific procedure performed, billed identically by the facility and (with modifier differences) the surgeon
- HCPCS supply and implant codes billed separately by the facility when applicable
Documentation Standards
The facility record should confirm the procedure performed matches what the surgeon’s operative note describes, with the same date of service and consistent laterality across both claims. Before scheduling, staff should confirm the specific CPT code is on the payer’s approved ASC procedure list, since performing an unapproved procedure in the ASC setting can result in a full denial rather than just a reduced payment.
Common Denial Reasons & How to Prevent Them
- Denials when the procedure billed is not on the payer’s approved ASC procedure list
- Denials from mismatched place-of-service codes between the facility and professional claims
- Denials when facility and surgeon claims disagree on laterality or procedure code
- Denials for implant or supply codes billed without itemized documentation
Tools That Help
ICD-10-CM Search · Denial Code Lookup · Modifier/POS Reference · RCM Calculators · NPI Lookup