Modifier code
Modifier AS: Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
PA/NP/CNS billing as surgical assistant.
Code
AS
When to use
When a PA, NP, or CNS assists at surgery.
Common issues
- Payment reduction vs MD assistant
Frequently asked questions
What is modifier AS?
Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
When should it be used?
When a PA, NP, or CNS assists at surgery.
Common issues when modifier is missing or wrong?
Payment reduction vs MD assistant.
Other modifiers
- 25 — Significant, separately identifiable E&M service on same day as procedureWhen E&M visit + procedure happen same day and the E&M was separately documented
- 26 — Professional componentSplits a procedure into its professional (physician interpretation) and technica
- 50 — Bilateral procedureProcedure performed on both sides of the body during a single session.
- 51 — Multiple proceduresMultiple procedures performed at the same session.
- 52 — Reduced servicesService partially reduced or eliminated at the physician's discretion.
- 53 — Discontinued procedureProcedure discontinued because of extenuating circumstances.
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