T4HCPCS Level II
Left foot, fifth digit
- Usage notes
- Append to procedure codes performed on the left foot, fifth digit.
- Common mistakes
- Using T4 (left) when the chart documents the corresponding right-foot toe (T9) — verify laterality before submitting.
Related modifiers
Frequently asked questions
What does modifier T4 mean?
Left foot, fifth digit
When do I use modifier T4?
Append to procedure codes performed on the left foot, fifth digit.
What's a common mistake with modifier T4?
Using T4 (left) when the chart documents the corresponding right-foot toe (T9) — verify laterality before submitting.
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.