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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  • M12.172—

    Kaschin-Beck disease, left ankle and foot

  • M12.179—

    Kaschin-Beck disease, unspecified ankle and foot

  • M12.18—

    Kaschin-Beck disease, vertebrae

  • M12.19—

    Kaschin-Beck disease, multiple sites

  • M12.2—

    Villonodular synovitis (pigmented)

  • M12.20—

    Villonodular synovitis (pigmented), unspecified site

  • M12.21—

    Villonodular synovitis (pigmented), shoulder

  • M12.211—

    Villonodular synovitis (pigmented), right shoulder

  • M12.212—

    Villonodular synovitis (pigmented), left shoulder

  • M12.219—

    Villonodular synovitis (pigmented), unspecified shoulder

  • M12.22—

    Villonodular synovitis (pigmented), elbow

  • M12.221—

    Villonodular synovitis (pigmented), right elbow

  • M12.222—

    Villonodular synovitis (pigmented), left elbow

  • M12.229—

    Villonodular synovitis (pigmented), unspecified elbow

  • M12.23—

    Villonodular synovitis (pigmented), wrist

  • M12.231—

    Villonodular synovitis (pigmented), right wrist

  • M12.232—

    Villonodular synovitis (pigmented), left wrist

  • M12.239—

    Villonodular synovitis (pigmented), unspecified wrist

  • M12.24—

    Villonodular synovitis (pigmented), hand

  • M12.241—

    Villonodular synovitis (pigmented), right hand

  • M12.242—

    Villonodular synovitis (pigmented), left hand

  • M12.249—

    Villonodular synovitis (pigmented), unspecified hand

  • M12.25—

    Villonodular synovitis (pigmented), hip

  • M12.251—

    Villonodular synovitis (pigmented), right hip

  • M12.252—

    Villonodular synovitis (pigmented), left hip

  • M12.259—

    Villonodular synovitis (pigmented), unspecified hip

  • M12.26—

    Villonodular synovitis (pigmented), knee

  • M12.261—

    Villonodular synovitis (pigmented), right knee

  • M12.262—

    Villonodular synovitis (pigmented), left knee

  • M12.269—

    Villonodular synovitis (pigmented), unspecified knee

  • M12.27—

    Villonodular synovitis (pigmented), ankle and foot

  • M12.271—

    Villonodular synovitis (pigmented), right ankle and foot

  • M12.272—

    Villonodular synovitis (pigmented), left ankle and foot

  • M12.279—

    Villonodular synovitis (pigmented), unspecified ankle and foot

  • M12.28—

    Villonodular synovitis (pigmented), other specified site

  • M12.29—

    Villonodular synovitis (pigmented), multiple sites

  • M12.3—

    Palindromic rheumatism

  • M12.30—

    Palindromic rheumatism, unspecified site

  • M12.31—

    Palindromic rheumatism, shoulder

  • M12.311—

    Palindromic rheumatism, right shoulder

  • M12.312—

    Palindromic rheumatism, left shoulder

  • M12.319—

    Palindromic rheumatism, unspecified shoulder

  • M12.32—

    Palindromic rheumatism, elbow

  • M12.321—

    Palindromic rheumatism, right elbow

  • M12.322—

    Palindromic rheumatism, left elbow

  • M12.329—

    Palindromic rheumatism, unspecified elbow

  • M12.33—

    Palindromic rheumatism, wrist

  • M12.331—

    Palindromic rheumatism, right wrist

  • M12.332—

    Palindromic rheumatism, left wrist

  • M12.339—

    Palindromic rheumatism, unspecified wrist

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