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ICD-10 CM Code M66.20

M66.20 Spontaneous rupture of extensor tendons, unspecified site

Includes

rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength

Excludes Type 2

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