M66 Spontaneous rupture of synovium and tendon

ICD-10-CM category M66 sits in Chapter 13 (Diseases of the musculoskeletal system and connective tissue, M00-M99). It contains 103 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.

Subcategories

M66.1 Rupture of synoviumM66.11 Rupture of synovium, shoulderM66.12 Rupture of synovium, elbowM66.13 Rupture of synovium, wristM66.14 Rupture of synovium, hand and fingersM66.15 Rupture of synovium, hipM66.17 Rupture of synovium, ankle, foot and toesM66.2 Spontaneous rupture of extensor tendonsM66.21 Spontaneous rupture of extensor tendons, shoulderM66.22 Spontaneous rupture of extensor tendons, upper armM66.23 Spontaneous rupture of extensor tendons, forearmM66.24 Spontaneous rupture of extensor tendons, handM66.25 Spontaneous rupture of extensor tendons, thighM66.26 Spontaneous rupture of extensor tendons, lower legM66.27 Spontaneous rupture of extensor tendons, ankle and footM66.3 Spontaneous rupture of flexor tendonsM66.31 Spontaneous rupture of flexor tendons, shoulderM66.32 Spontaneous rupture of flexor tendons, upper armM66.33 Spontaneous rupture of flexor tendons, forearmM66.34 Spontaneous rupture of flexor tendons, handM66.35 Spontaneous rupture of flexor tendons, thighM66.36 Spontaneous rupture of flexor tendons, lower legM66.37 Spontaneous rupture of flexor tendons, ankle and footM66.8 Spontaneous rupture of other tendonsM66.81 Spontaneous rupture of other tendons, shoulderM66.82 Spontaneous rupture of other tendons, upper armM66.83 Spontaneous rupture of other tendons, forearmM66.84 Spontaneous rupture of other tendons, handM66.85 Spontaneous rupture of other tendons, thighM66.86 Spontaneous rupture of other tendons, lower legM66.87 Spontaneous rupture of other tendons, ankle and foot

Billable codes in M66

Search within ICD-10-CM for M66 and related codes