M66.2
Spontaneous rupture of extensor tendons
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 12 never code together
M66code
Excludes2
- rotator cuff syndrome (M75.1-)M75.1-
- rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region
M00-M99chapter
Excludes2
- arthropathic psoriasis (L40.5-)L40.5-
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- compartment syndrome (traumatic) (T79.A-)T79.A-
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 2
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 5 same parent — M66
Subordinate codes 10
M66.20 Spontaneous rupture of extensor tendons, unspecified site M66.21 Spontaneous rupture of extensor tendons, shoulder M66.22 Spontaneous rupture of extensor tendons, upper arm M66.23 Spontaneous rupture of extensor tendons, forearm M66.24 Spontaneous rupture of extensor tendons, hand M66.25 Spontaneous rupture of extensor tendons, thigh M66.26 Spontaneous rupture of extensor tendons, lower leg M66.27 Spontaneous rupture of extensor tendons, ankle and foot M66.28 Spontaneous rupture of extensor tendons, other site M66.29 Spontaneous rupture of extensor tendons, multiple sites
Additional references
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Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.