-82

CPT Modifier 82 - Assistant Surgeon (When Qualified Resident Surgeon Not Available)

Short Definition

A physician provided assistant surgeon services in a teaching hospital setting where no qualified resident surgeon was available to assist.

Long Definition

Modifier 82 is specific to teaching hospital environments. In teaching hospitals with residency training programs related to the medical specialty of the procedure, Medicare and most payers assume a qualified resident is available to act as first assistant — and therefore will not pay separately for a physician assistant surgeon. Modifier 82 overrides this assumption by explicitly indicating that no qualified resident was available, making the use of an attending or outside physician as the assistant surgeon medically necessary and separately billable. This modifier is physician-only.

When to Use

• The procedure was performed in a teaching hospital.
• The hospital has a residency training program in the relevant surgical specialty.
• A qualified resident surgeon was not available at the time of the procedure.
• A physician (MD or DO) served as the assistant surgeon.
• Documentation clearly states that no qualified resident was available.

When NOT to Use

• In non-teaching hospitals — use modifier 80 or 81 instead, as applicable.
• When a qualified resident was available but simply not utilized — modifier 82 would be inappropriate and unsupported.
• When a PA, NP, CNS, or RNFA is the assistant — use modifier AS.
• When the MPFS assistant-at-surgery indicator for the procedure is “0” (not allowed).

Documentation Requirements

This modifier carries a high audit risk and requires robust documentation:

• A clear statement in the operative/procedure note (or supporting documentation) that “no qualified resident surgeon was available” at the time of the procedure.
• Identification of the assistant surgeon (name, credentials, NPI).
• Medical necessity for having an assistant surgeon at all.
• The specific services the assistant surgeon rendered.
• Hospital records or scheduling logs supporting resident unavailability may also be needed on appeal or audit.

Billing Notes

• Append modifier 82 to the same CPT code as the primary surgeon.
• The assistant surgeon bills under their own NPI.
• Medicare allowable is typically 16% of the surgical fee schedule allowable, same as modifier 80, when approved.
• Always check the MPFS assistant-at-surgery eligibility indicator before billing.
• CMS and Medicare require the documentation of “exceptional medical circumstances” — the unavailability of a qualified resident must be clearly stated, not just implied.
• High likelihood of medical review; ensure documentation is airtight before submission.

Related Modifiers (Assistant-at-Surgery Family)

Modifier	Description
-80	Assistant Surgeon — full procedure, physician only
-81	Minimum Assistant Surgeon — partial procedure, physician only
-82	Assistant Surgeon — teaching hospital, no qualified resident available, physician only
-AS	Assistant Surgeon — PA, NP, CNS, or RNFA

Quick Example

• Teaching hospital performs a complex spinal fusion (e.g., 22612).
• Usual first assistant would be a senior orthopedic or neurosurgery resident.
• On this date, no qualified resident was available (documented in the record).
• Attending from another group assists the primary surgeon.
• Assistant surgeon bills: 22612-82 under their own NPI.
• Op note and supporting hospital documentation state: “No qualified resident surgeon was available on [date] to serve as first assistant; [physician name, MD] served as assistant surgeon.”