Modifier AS — Physician assistant, nurse practitioner, or clinical nurse specialist servic

ASHCPCS Level II

Physician assistant, nurse practitioner, or clinical nurse specialist services

Usage notes: Append to a surgical procedure code to indicate a physician assistant, nurse practitioner, or clinical nurse specialist served as assistant at surgery.
Common mistakes: Using AS for a physician assistant at surgery — AS applies to non-physician assistants; a physician assistant surgeon uses modifier 80/81/82 instead (CPT modifiers, AMA-copyrighted).

Related modifiers

A1Dressing for one wound A2Dressing for two wounds A3Dressing for three wounds A4Dressing for four wounds A5Dressing for five wounds A6Dressing for six wounds A7Dressing for seven wounds A8Dressing for eight wounds

Frequently asked questions

What does modifier AS mean?

Physician assistant, nurse practitioner, or clinical nurse specialist services

When do I use modifier AS?

Append to a surgical procedure code to indicate a physician assistant, nurse practitioner, or clinical nurse specialist served as assistant at surgery.

What's a common mistake with modifier AS?

Using AS for a physician assistant at surgery — AS applies to non-physician assistants; a physician assistant surgeon uses modifier 80/81/82 instead (CPT modifiers, AMA-copyrighted).

HCPCS modifier data from CMS. CPT® is a registered trademark of the American Medical Association — CPT modifier descriptions are not included on this site. Always verify codes with authoritative sources before making billing decisions.