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ICD-10-CM 2027

ICD-10 code for knee monoarthritis

M13.16

Monoarthritis, not elsewhere classified, knee

Header — needs a more specific code

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

About coding knee monoarthritis

The ICD-10-CM code for knee monoarthritis is M13.16 (Monoarthritis, not elsewhere classified, knee).

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

To report this condition, pick the subcode that matches the documentation: M13.161 (knee), M13.162 (knee) and M13.169 (knee).

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 knee monoarthritis ICD-10 codes

What is the ICD-10 code for knee monoarthritis?

M13.16 — Monoarthritis, not elsewhere classified, knee (a header code; report a more specific subcode).

Is M13.16 billable?

No. M13.16 is a header code. Report one of its more specific subcodes instead.