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ICD-10-CM 2027

ICD-10 code for thumb trigger finger

M65.31

Trigger thumb

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Trigger finger (acquired) › thumb”. Page updated September 29, 2026.

About coding thumb trigger finger

The ICD-10-CM code for thumb trigger finger is M65.31 (Trigger thumb).

Within M65.3 (Trigger finger), M65.31 is specifically for Trigger thumb. Related codes cover unspecified finger (M65.30), index finger (M65.32), middle finger (M65.33), ring finger (M65.34) and little finger (M65.35).

To report this condition, pick the subcode that matches the documentation: M65.311 (right thumb), M65.312 (left thumb) and M65.319 (unspecified thumb).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about thumb trigger finger ICD-10 codes

What is the ICD-10 code for thumb trigger finger?

M65.31 — Trigger thumb (a header code; report a more specific subcode).

Is M65.31 billable?

No. M65.31 is a header code. Report one of its more specific subcodes instead.