M66.1

M66.1: Rupture of synovium

Non-billable headerICD-10-CM

M66.1 is a non-billable header ICD-10-CM code for rupture of synovium. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2: not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

rupture of popliteal cyst (M66.0)

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Rupture of synovial cyst

Excludes2 inherited from the categories above M66.1

Not part of this code, but both may be coded when both are present.

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

Other codes that can never be billed with M66.1

Their own Excludes1 notes name this code, so the conflict is not listed above.

M71.3Other bursal cyst

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead M66.1

8 child codes. Green means billable.