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M66.26

M66.26: Spontaneous rupture of extensor tendons, lower leg

Non-billable headerICD-10-CM

M66.26 is a non-billable header ICD-10-CM code for spontaneous rupture of extensor tendons, lower leg. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 inherited from the categories above M66.26

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

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 M66.26

3 child codes. Green means billable.

Other codes under M66.2

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.