Disorders of synovium and tendon (M65-M67)
M66: Spontaneous rupture of synovium and tendon

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

excludes2
rotator cuff syndrome (M75.1-)
rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region
M66.0: Rupture of popliteal cyst
M66.1: Rupture of synovium
M66.2: Spontaneous rupture of extensor tendons
M66.3: Spontaneous rupture of flexor tendons
M66.8: Spontaneous rupture of other tendons
M66.9: Spontaneous rupture of unspecified tendon

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