Physician Assistant, Surgical: Billing the Assist Role in an ASC
In an ambulatory surgery center, a surgical physician assistant (PA) supports the operating surgeon rather than performing a separately coded service, so there is no distinct CPT family for the role. The case is billed against the same surgical procedure code the surgeon reports, appended with modifier -AS to show a physician assistant served as the assistant at surgery. Payment for an assistant is allowed only when the procedure permits an assistant and the documentation supports the assist.
DataLily's procedure library tracks CPT-specific prior-authorization and documentation requirements, which is where assistant-at-surgery eligibility for a given code is confirmed.
This role bills around the surgical case rather than carrying its own ASC-payable procedure codes. See the surgical specialty hubs for the procedures performed in the ASC.
Do physician assistants work in ambulatory surgery centers?
Yes. Surgical PAs commonly work in ASCs as the assistant at surgery, supporting the operating surgeon during outpatient procedures. Their clinical work is real, but on the claim it attaches to the surgeon's procedure code rather than being reported as a standalone service.
What CPT codes does a surgical physician assistant use?
There is no separate CPT family for the surgical PA. The PA reports the same procedure code the surgeon performs, appended with modifier -AS to show that a physician assistant served as the assistant at surgery. The code therefore varies by case and by surgeon specialty.
How is a PA's assist at surgery billed in an ASC?
The PA's professional claim uses the surgeon's procedure code with modifier -AS and place of service 24 for an ASC. An assistant is payable only when the specific code allows an assistant at surgery and the operative documentation supports the role.