All ICD10 Codes
Chapter 13

M00–M99: Diseases of the Musculoskeletal System and Connective Tissue

Diseases of the Musculoskeletal System and Connective Tissue diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
All CodesBillable Only
Internal Codes
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  • M66.179—

    Rupture of synovium, unspecified toe(s)

  • M66.18—

    Rupture of synovium, other site

  • M66.20—

    Spontaneous rupture of extensor tendons, unspecified site

  • M66.211—

    Spontaneous rupture of extensor tendons, right shoulder

  • M66.212—

    Spontaneous rupture of extensor tendons, left shoulder

  • M66.219—

    Spontaneous rupture of extensor tendons, unspecified shoulder

  • M66.221—

    Spontaneous rupture of extensor tendons, right upper arm

  • M66.222—

    Spontaneous rupture of extensor tendons, left upper arm

  • M66.229—

    Spontaneous rupture of extensor tendons, unspecified upper arm

  • M66.231—

    Spontaneous rupture of extensor tendons, right forearm

  • M66.232—

    Spontaneous rupture of extensor tendons, left forearm

  • M66.239—

    Spontaneous rupture of extensor tendons, unspecified forearm

  • M66.241—

    Spontaneous rupture of extensor tendons, right hand

  • M66.242—

    Spontaneous rupture of extensor tendons, left hand

  • M66.249—

    Spontaneous rupture of extensor tendons, unspecified hand

  • M66.251—

    Spontaneous rupture of extensor tendons, right thigh

  • M66.252—

    Spontaneous rupture of extensor tendons, left thigh

  • M66.259—

    Spontaneous rupture of extensor tendons, unspecified thigh

  • M66.261—

    Spontaneous rupture of extensor tendons, right lower leg

  • M66.262—

    Spontaneous rupture of extensor tendons, left lower leg

  • M66.269—

    Spontaneous rupture of extensor tendons, unspecified lower leg

  • M66.271—

    Spontaneous rupture of extensor tendons, right ankle and foot

  • M66.272—

    Spontaneous rupture of extensor tendons, left ankle and foot

  • M66.279—

    Spontaneous rupture of extensor tendons, unspecified ankle and foot

  • M66.28—

    Spontaneous rupture of extensor tendons, other site

  • M66.29—

    Spontaneous rupture of extensor tendons, multiple sites

  • M66.30—

    Spontaneous rupture of flexor tendons, unspecified site

  • M66.311—

    Spontaneous rupture of flexor tendons, right shoulder

  • M66.312—

    Spontaneous rupture of flexor tendons, left shoulder

  • M66.319—

    Spontaneous rupture of flexor tendons, unspecified shoulder

  • M66.321—

    Spontaneous rupture of flexor tendons, right upper arm

  • M66.322—

    Spontaneous rupture of flexor tendons, left upper arm

  • M66.329—

    Spontaneous rupture of flexor tendons, unspecified upper arm

  • M66.331—

    Spontaneous rupture of flexor tendons, right forearm

  • M66.332—

    Spontaneous rupture of flexor tendons, left forearm

  • M66.339—

    Spontaneous rupture of flexor tendons, unspecified forearm

  • M66.341—

    Spontaneous rupture of flexor tendons, right hand

  • M66.342—

    Spontaneous rupture of flexor tendons, left hand

  • M66.349—

    Spontaneous rupture of flexor tendons, unspecified hand

  • M66.351—

    Spontaneous rupture of flexor tendons, right thigh

  • M66.352—

    Spontaneous rupture of flexor tendons, left thigh

  • M66.359—

    Spontaneous rupture of flexor tendons, unspecified thigh

  • M66.361—

    Spontaneous rupture of flexor tendons, right lower leg

  • M66.362—

    Spontaneous rupture of flexor tendons, left lower leg

  • M66.369—

    Spontaneous rupture of flexor tendons, unspecified lower leg

  • M66.371—

    Spontaneous rupture of flexor tendons, right ankle and foot

  • M66.372—

    Spontaneous rupture of flexor tendons, left ankle and foot

  • M66.379—

    Spontaneous rupture of flexor tendons, unspecified ankle and foot

  • M66.38—

    Spontaneous rupture of flexor tendons, other site

  • M66.39—

    Spontaneous rupture of flexor tendons, multiple sites

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