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ICD-10-CM 2027

ICD-10 code for ankle and foot synovitis

M65.97

Unspecified synovitis and tenosynovitis, ankle and foot

Header — needs a more specific code

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

About coding ankle and foot synovitis

The ICD-10-CM code for ankle and foot synovitis is M65.97 (Unspecified synovitis and tenosynovitis, ankle and foot).

Within M65.9 (synovitis and tenosynovitis, unspecified), M65.97 is specifically for unspecified synovitis and tenosynovitis, ankle and foot. Related codes cover unspecified site (M65.90), shoulder (M65.91), upper arm (M65.92), forearm (M65.93), hand (M65.94), thigh (M65.95), lower leg (M65.96), other site (M65.98) and 1 more.

To report this condition, pick the subcode that matches the documentation: M65.971 (foot), M65.972 (foot) and M65.979 (foot).

It was added in FY2025, effective October 1, 2024.

Common questions about ankle and foot synovitis ICD-10 codes

What is the ICD-10 code for ankle and foot synovitis?

M65.97 — Unspecified synovitis and tenosynovitis, ankle and foot (a header code; report a more specific subcode).

Is M65.97 billable?

No. M65.97 is a header code. Report one of its more specific subcodes instead.