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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  • M12.85—

    Other specific arthropathies, not elsewhere classified, hip

  • M12.851—

    Other specific arthropathies, not elsewhere classified, right hip

  • M12.852—

    Other specific arthropathies, not elsewhere classified, left hip

  • M12.859—

    Other specific arthropathies, not elsewhere classified, unspecified hip

  • M12.86—

    Other specific arthropathies, not elsewhere classified, knee

  • M12.861—

    Other specific arthropathies, not elsewhere classified, right knee

  • M12.862—

    Other specific arthropathies, not elsewhere classified, left knee

  • M12.869—

    Other specific arthropathies, not elsewhere classified, unspecified knee

  • M12.87—

    Other specific arthropathies, not elsewhere classified, ankle and foot

  • M12.871—

    Other specific arthropathies, not elsewhere classified, right ankle and foot

  • M12.872—

    Other specific arthropathies, not elsewhere classified, left ankle and foot

  • M12.879—

    Other specific arthropathies, not elsewhere classified, unspecified ankle and foot

  • M12.88—

    Other specific arthropathies, not elsewhere classified, other specified site

  • M12.89—

    Other specific arthropathies, not elsewhere classified, multiple sites

  • M12.9—

    Arthropathy, unspecified

  • M13—

    Other arthritis

  • M13.0—

    Polyarthritis, unspecified

  • M13.1—

    Monoarthritis, not elsewhere classified

  • M13.10—

    Monoarthritis, not elsewhere classified, unspecified site

  • M13.11—

    Monoarthritis, not elsewhere classified, shoulder

  • M13.111—

    Monoarthritis, not elsewhere classified, right shoulder

  • M13.112—

    Monoarthritis, not elsewhere classified, left shoulder

  • M13.119—

    Monoarthritis, not elsewhere classified, unspecified shoulder

  • M13.12—

    Monoarthritis, not elsewhere classified, elbow

  • M13.121—

    Monoarthritis, not elsewhere classified, right elbow

  • M13.122—

    Monoarthritis, not elsewhere classified, left elbow

  • M13.129—

    Monoarthritis, not elsewhere classified, unspecified elbow

  • M13.13—

    Monoarthritis, not elsewhere classified, wrist

  • M13.131—

    Monoarthritis, not elsewhere classified, right wrist

  • M13.132—

    Monoarthritis, not elsewhere classified, left wrist

  • M13.139—

    Monoarthritis, not elsewhere classified, unspecified wrist

  • M13.14—

    Monoarthritis, not elsewhere classified, hand

  • M13.141—

    Monoarthritis, not elsewhere classified, right hand

  • M13.142—

    Monoarthritis, not elsewhere classified, left hand

  • M13.149—

    Monoarthritis, not elsewhere classified, unspecified hand

  • M13.15—

    Monoarthritis, not elsewhere classified, hip

  • M13.151—

    Monoarthritis, not elsewhere classified, right hip

  • M13.152—

    Monoarthritis, not elsewhere classified, left hip

  • M13.159—

    Monoarthritis, not elsewhere classified, unspecified hip

  • M13.16—

    Monoarthritis, not elsewhere classified, knee

  • M13.161—

    Monoarthritis, not elsewhere classified, right knee

  • M13.162—

    Monoarthritis, not elsewhere classified, left knee

  • M13.169—

    Monoarthritis, not elsewhere classified, unspecified knee

  • M13.17—

    Monoarthritis, not elsewhere classified, ankle and foot

  • M13.171—

    Monoarthritis, not elsewhere classified, right ankle and foot

  • M13.172—

    Monoarthritis, not elsewhere classified, left ankle and foot

  • M13.179—

    Monoarthritis, not elsewhere classified, unspecified ankle and foot

  • M13.8—

    Other specified arthritis

  • M13.80—

    Other specified arthritis, unspecified site

  • M13.81—

    Other specified arthritis, shoulder

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