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ICD-10-CM 2027

ICD-10 code for thigh synovitis

M65.95

Unspecified synovitis and tenosynovitis, thigh

Header — needs a more specific code

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

About coding thigh synovitis

The ICD-10-CM code for thigh synovitis is M65.95 (Unspecified synovitis and tenosynovitis, thigh).

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

To report this condition, pick the subcode that matches the documentation: M65.951 (thigh), M65.952 (thigh) and M65.959 (thigh).

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

Common questions about thigh synovitis ICD-10 codes

What is the ICD-10 code for thigh synovitis?

M65.95 — Unspecified synovitis and tenosynovitis, thigh (a header code; report a more specific subcode).

Is M65.95 billable?

No. M65.95 is a header code. Report one of its more specific subcodes instead.