Is M66.17 a billable ICD-10-CM code?

No. M66.17 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M66.17 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).

M66.17

M66.17 — Rupture of synovium, ankle, foot and toes

Non-billable headerICD-10-CM

M66.17 is a non-billable header ICD-10-CM code for rupture of synovium, ankle, foot and toes. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 inherited from the categories above M66.17

Also inherited, and the opposite of Excludes1: these conditions are not part of M66.17, but a patient can have both, so you may code both.

Written on M66.1 — Rupture of synovium

rupture of popliteal cyst (M66.0)

Written on M66 — Spontaneous rupture of synovium and tendon

rotator cuff syndrome (M75.1-)
rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region

Risk adjustment

M66.17 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

M66.17 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 M66.17

9 child codes. Green means billable.

Related codes at this level

Codes that share M66.1. If M66.17 is not quite right, the correct code is usually one of these.

Questions about M66.17

Is M66.17 a billable ICD-10-CM code?: No. M66.17 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M66.17 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).