Is M65.86 a billable ICD-10-CM code?

No. M65.86 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M65.86 sit in the tabular list?

Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Disorders of synovium and tendon (M65-M67).

What cannot be coded together with M65.86?

M65.86 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M65.86 (M65) and apply to it just the same.

M65.86

M65.86 — Other synovitis and tenosynovitis, lower leg

Non-billable headerICD-10-CM

M65.86 is a non-billable header ICD-10-CM code for other synovitis and tenosynovitis, lower leg. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above M65.86

These are not written on M65.86, but they bind it: a note on a category applies to every code beneath it. Billing M65.86 with anything listed here is a denial.

Written on M65 — Synovitis and tenosynovitis

chronic crepitant synovitis of hand and wrist (M70.0-)
current injury - see injury of ligament or tendon by body region
soft tissue disorders related to use, overuse and pressure (M70.-)

Risk adjustment

M65.86 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code history

M65.86 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead M65.86

3 child codes. Green means billable.

Related codes at this level

Codes that share M65.8. If M65.86 is not quite right, the correct code is usually one of these.

Questions about M65.86

Is M65.86 a billable ICD-10-CM code?: No. M65.86 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M65.86 sit in the tabular list?: Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Disorders of synovium and tendon (M65-M67).
What cannot be coded together with M65.86?: M65.86 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M65.86 (M65) and apply to it just the same.