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ICD-10-CM 2027

ICD-10 code for ankle monoarthritis

M13.17

Monoarthritis, not elsewhere classified, ankle and foot

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Monoarthritis › ankle”. Page updated September 29, 2026.

About coding ankle monoarthritis

The ICD-10-CM code for ankle monoarthritis is M13.17 (Monoarthritis, not elsewhere classified, ankle and foot).

Within M13.1 (monoarthritis, not elsewhere classified), M13.17 is specifically for monoarthritis, not elsewhere classified, ankle and foot. Related codes cover unspecified site (M13.10), shoulder (M13.11), elbow (M13.12), wrist (M13.13), hand (M13.14), hip (M13.15) and knee (M13.16).

To report this condition, pick the subcode that matches the documentation: M13.171 (foot), M13.172 (foot) and M13.179 (foot).

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 ankle monoarthritis ICD-10 codes

What is the ICD-10 code for ankle monoarthritis?

M13.17 — Monoarthritis, not elsewhere classified, ankle and foot (a header code; report a more specific subcode).

Is M13.17 billable?

No. M13.17 is a header code. Report one of its more specific subcodes instead.