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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  • M15.8—

    Other polyosteoarthritis

  • M15.9—

    Polyosteoarthritis, unspecified

  • M16—

    Osteoarthritis of hip

  • M16.0—

    Bilateral primary osteoarthritis of hip

  • M16.1—

    Unilateral primary osteoarthritis of hip

  • M16.10—

    Unilateral primary osteoarthritis, unspecified hip

  • M16.11—

    Unilateral primary osteoarthritis, right hip

  • M16.12—

    Unilateral primary osteoarthritis, left hip

  • M16.2—

    Bilateral osteoarthritis resulting from hip dysplasia

  • M16.3—

    Unilateral osteoarthritis resulting from hip dysplasia

  • M16.30—

    Unilateral osteoarthritis resulting from hip dysplasia, unspecified hip

  • M16.31—

    Unilateral osteoarthritis resulting from hip dysplasia, right hip

  • M16.32—

    Unilateral osteoarthritis resulting from hip dysplasia, left hip

  • M16.4—

    Bilateral post-traumatic osteoarthritis of hip

  • M16.5—

    Unilateral post-traumatic osteoarthritis of hip

  • M16.50—

    Unilateral post-traumatic osteoarthritis, unspecified hip

  • M16.51—

    Unilateral post-traumatic osteoarthritis, right hip

  • M16.52—

    Unilateral post-traumatic osteoarthritis, left hip

  • M16.6—

    Other bilateral secondary osteoarthritis of hip

  • M16.7—

    Other unilateral secondary osteoarthritis of hip

  • M16.9—

    Osteoarthritis of hip, unspecified

  • M17—

    Osteoarthritis of knee

  • M17.0—

    Bilateral primary osteoarthritis of knee

  • M17.1—

    Unilateral primary osteoarthritis of knee

  • M17.10—

    Unilateral primary osteoarthritis, unspecified knee

  • M17.11—

    Unilateral primary osteoarthritis, right knee

  • M17.12—

    Unilateral primary osteoarthritis, left knee

  • M17.2—

    Bilateral post-traumatic osteoarthritis of knee

  • M17.3—

    Unilateral post-traumatic osteoarthritis of knee

  • M17.30—

    Unilateral post-traumatic osteoarthritis, unspecified knee

  • M17.31—

    Unilateral post-traumatic osteoarthritis, right knee

  • M17.32—

    Unilateral post-traumatic osteoarthritis, left knee

  • M17.4—

    Other bilateral secondary osteoarthritis of knee

  • M17.5—

    Other unilateral secondary osteoarthritis of knee

  • M17.9—

    Osteoarthritis of knee, unspecified

  • M18—

    Osteoarthritis of first carpometacarpal joint

  • M18.0—

    Bilateral primary osteoarthritis of first carpometacarpal joints

  • M18.1—

    Unilateral primary osteoarthritis of first carpometacarpal joint

  • M18.10—

    Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand

  • M18.11—

    Unilateral primary osteoarthritis of first carpometacarpal joint, right hand

  • M18.12—

    Unilateral primary osteoarthritis of first carpometacarpal joint, left hand

  • M18.2—

    Bilateral post-traumatic osteoarthritis of first carpometacarpal joints

  • M18.3—

    Unilateral post-traumatic osteoarthritis of first carpometacarpal joint

  • M18.30—

    Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand

  • M18.31—

    Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, right hand

  • M18.32—

    Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand

  • M18.4—

    Other bilateral secondary osteoarthritis of first carpometacarpal joints

  • M18.5—

    Other unilateral secondary osteoarthritis of first carpometacarpal joint

  • M18.50—

    Other unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand

  • M18.51—

    Other unilateral secondary osteoarthritis of first carpometacarpal joint, right hand

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