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
Internal Codes
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  • M00.149—

    Pneumococcal arthritis, unspecified hand

  • M00.15—

    Pneumococcal arthritis, hip

  • M00.151—

    Pneumococcal arthritis, right hip

  • M00.152—

    Pneumococcal arthritis, left hip

  • M00.159—

    Pneumococcal arthritis, unspecified hip

  • M00.16—

    Pneumococcal arthritis, knee

  • M00.161—

    Pneumococcal arthritis, right knee

  • M00.162—

    Pneumococcal arthritis, left knee

  • M00.169—

    Pneumococcal arthritis, unspecified knee

  • M00.17—

    Pneumococcal arthritis, ankle and foot

  • M00.171—

    Pneumococcal arthritis, right ankle and foot

  • M00.172—

    Pneumococcal arthritis, left ankle and foot

  • M00.179—

    Pneumococcal arthritis, unspecified ankle and foot

  • M00.18—

    Pneumococcal arthritis, vertebrae

  • M00.19—

    Pneumococcal polyarthritis

  • M00.2—

    Other streptococcal arthritis and polyarthritis

  • M00.20—

    Other streptococcal arthritis, unspecified joint

  • M00.21—

    Other streptococcal arthritis, shoulder

  • M00.211—

    Other streptococcal arthritis, right shoulder

  • M00.212—

    Other streptococcal arthritis, left shoulder

  • M00.219—

    Other streptococcal arthritis, unspecified shoulder

  • M00.22—

    Other streptococcal arthritis, elbow

  • M00.221—

    Other streptococcal arthritis, right elbow

  • M00.222—

    Other streptococcal arthritis, left elbow

  • M00.229—

    Other streptococcal arthritis, unspecified elbow

  • M00.23—

    Other streptococcal arthritis, wrist

  • M00.231—

    Other streptococcal arthritis, right wrist

  • M00.232—

    Other streptococcal arthritis, left wrist

  • M00.239—

    Other streptococcal arthritis, unspecified wrist

  • M00.24—

    Other streptococcal arthritis, hand

  • M00.241—

    Other streptococcal arthritis, right hand

  • M00.242—

    Other streptococcal arthritis, left hand

  • M00.249—

    Other streptococcal arthritis, unspecified hand

  • M00.25—

    Other streptococcal arthritis, hip

  • M00.251—

    Other streptococcal arthritis, right hip

  • M00.252—

    Other streptococcal arthritis, left hip

  • M00.259—

    Other streptococcal arthritis, unspecified hip

  • M00.26—

    Other streptococcal arthritis, knee

  • M00.261—

    Other streptococcal arthritis, right knee

  • M00.262—

    Other streptococcal arthritis, left knee

  • M00.269—

    Other streptococcal arthritis, unspecified knee

  • M00.27—

    Other streptococcal arthritis, ankle and foot

  • M00.271—

    Other streptococcal arthritis, right ankle and foot

  • M00.272—

    Other streptococcal arthritis, left ankle and foot

  • M00.279—

    Other streptococcal arthritis, unspecified ankle and foot

  • M00.28—

    Other streptococcal arthritis, vertebrae

  • M00.29—

    Other streptococcal polyarthritis

  • M00.8—

    Arthritis and polyarthritis due to other bacteria

  • M00.80—

    Arthritis due to other bacteria, unspecified joint

  • M00.81—

    Arthritis due to other bacteria, shoulder

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