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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  • M66.359—

    Spontaneous rupture of flexor tendons, unspecified thigh

  • M66.36—

    Spontaneous rupture of flexor tendons, lower leg

  • 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

  • M66.37—

    Spontaneous rupture of flexor tendons, ankle and foot

  • 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

  • M66.8—

    Spontaneous rupture of other tendons

  • M66.80—

    Spontaneous rupture of other tendons, unspecified site

  • M66.81—

    Spontaneous rupture of other tendons, shoulder

  • M66.811—

    Spontaneous rupture of other tendons, right shoulder

  • M66.812—

    Spontaneous rupture of other tendons, left shoulder

  • M66.819—

    Spontaneous rupture of other tendons, unspecified shoulder

  • M66.82—

    Spontaneous rupture of other tendons, upper arm

  • M66.821—

    Spontaneous rupture of other tendons, right upper arm

  • M66.822—

    Spontaneous rupture of other tendons, left upper arm

  • M66.829—

    Spontaneous rupture of other tendons, unspecified upper arm

  • M66.83—

    Spontaneous rupture of other tendons, forearm

  • M66.831—

    Spontaneous rupture of other tendons, right forearm

  • M66.832—

    Spontaneous rupture of other tendons, left forearm

  • M66.839—

    Spontaneous rupture of other tendons, unspecified forearm

  • M66.84—

    Spontaneous rupture of other tendons, hand

  • M66.841—

    Spontaneous rupture of other tendons, right hand

  • M66.842—

    Spontaneous rupture of other tendons, left hand

  • M66.849—

    Spontaneous rupture of other tendons, unspecified hand

  • M66.85—

    Spontaneous rupture of other tendons, thigh

  • M66.851—

    Spontaneous rupture of other tendons, right thigh

  • M66.852—

    Spontaneous rupture of other tendons, left thigh

  • M66.859—

    Spontaneous rupture of other tendons, unspecified thigh

  • M66.86—

    Spontaneous rupture of other tendons, lower leg

  • M66.861—

    Spontaneous rupture of other tendons, right lower leg

  • M66.862—

    Spontaneous rupture of other tendons, left lower leg

  • M66.869—

    Spontaneous rupture of other tendons, unspecified lower leg

  • M66.87—

    Spontaneous rupture of other tendons, ankle and foot

  • M66.871—

    Spontaneous rupture of other tendons, right ankle and foot

  • M66.872—

    Spontaneous rupture of other tendons, left ankle and foot

  • M66.879—

    Spontaneous rupture of other tendons, unspecified ankle and foot

  • M66.88—

    Spontaneous rupture of other tendons, other sites

  • M66.89—

    Spontaneous rupture of other tendons, multiple sites

  • M66.9—

    Spontaneous rupture of unspecified tendon

  • M67—

    Other disorders of synovium and tendon

  • M67.0—

    Short Achilles tendon (acquired)

  • M67.00—

    Short Achilles tendon (acquired), unspecified ankle

  • M67.01—

    Short Achilles tendon (acquired), right ankle

  • M67.02—

    Short Achilles tendon (acquired), left ankle

  • M67.2—

    Synovial hypertrophy, not elsewhere classified

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