F1HCPCS Level II
Left hand, second digit
- Usage notes
- Append to procedure codes performed on the left hand, second digit (index finger).
- Common mistakes
- Billing a single line with no digit modifier when the same procedure was performed on multiple fingers, which should be billed as separate lines each with its own digit modifier.
Related modifiers
Frequently asked questions
What does modifier F1 mean?
Left hand, second digit
When do I use modifier F1?
Append to procedure codes performed on the left hand, second digit (index finger).
What's a common mistake with modifier F1?
Billing a single line with no digit modifier when the same procedure was performed on multiple fingers, which should be billed as separate lines each with its own digit modifier.
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.