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)
  • 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
Browse by Section24 Sections
Internal Codes
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  • M00—

    Pyogenic arthritis

  • M00.0—

    Staphylococcal arthritis and polyarthritis

  • M00.00—

    Staphylococcal arthritis, unspecified joint

  • M00.01—

    Staphylococcal arthritis, shoulder

  • M00.011—

    Staphylococcal arthritis, right shoulder

  • M00.012—

    Staphylococcal arthritis, left shoulder

  • M00.019—

    Staphylococcal arthritis, unspecified shoulder

  • M00.02—

    Staphylococcal arthritis, elbow

  • M00.021—

    Staphylococcal arthritis, right elbow

  • M00.022—

    Staphylococcal arthritis, left elbow

  • M00.029—

    Staphylococcal arthritis, unspecified elbow

  • M00.03—

    Staphylococcal arthritis, wrist

  • M00.031—

    Staphylococcal arthritis, right wrist

  • M00.032—

    Staphylococcal arthritis, left wrist

  • M00.039—

    Staphylococcal arthritis, unspecified wrist

  • M00.04—

    Staphylococcal arthritis, hand

  • M00.041—

    Staphylococcal arthritis, right hand

  • M00.042—

    Staphylococcal arthritis, left hand

  • M00.049—

    Staphylococcal arthritis, unspecified hand

  • M00.05—

    Staphylococcal arthritis, hip

  • M00.051—

    Staphylococcal arthritis, right hip

  • M00.052—

    Staphylococcal arthritis, left hip

  • M00.059—

    Staphylococcal arthritis, unspecified hip

  • M00.06—

    Staphylococcal arthritis, knee

  • M00.061—

    Staphylococcal arthritis, right knee

  • M00.062—

    Staphylococcal arthritis, left knee

  • M00.069—

    Staphylococcal arthritis, unspecified knee

  • M00.07—

    Staphylococcal arthritis, ankle and foot

  • M00.071—

    Staphylococcal arthritis, right ankle and foot

  • M00.072—

    Staphylococcal arthritis, left ankle and foot

  • M00.079—

    Staphylococcal arthritis, unspecified ankle and foot

  • M00.08—

    Staphylococcal arthritis, vertebrae

  • M00.09—

    Staphylococcal polyarthritis

  • M00.1—

    Pneumococcal arthritis and polyarthritis

  • M00.10—

    Pneumococcal arthritis, unspecified joint

  • M00.11—

    Pneumococcal arthritis, shoulder

  • M00.111—

    Pneumococcal arthritis, right shoulder

  • M00.112—

    Pneumococcal arthritis, left shoulder

  • M00.119—

    Pneumococcal arthritis, unspecified shoulder

  • M00.12—

    Pneumococcal arthritis, elbow

  • M00.121—

    Pneumococcal arthritis, right elbow

  • M00.122—

    Pneumococcal arthritis, left elbow

  • M00.129—

    Pneumococcal arthritis, unspecified elbow

  • M00.13—

    Pneumococcal arthritis, wrist

  • M00.131—

    Pneumococcal arthritis, right wrist

  • M00.132—

    Pneumococcal arthritis, left wrist

  • M00.139—

    Pneumococcal arthritis, unspecified wrist

  • M00.14—

    Pneumococcal arthritis, hand

  • M00.141—

    Pneumococcal arthritis, right hand

  • M00.142—

    Pneumococcal arthritis, left hand

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