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)
Internal Codes
  • M08.069

    Unspecified juvenile rheumatoid arthritis, unspecified knee

  • M08.071

    Unspecified juvenile rheumatoid arthritis, right ankle and foot

  • M08.072

    Unspecified juvenile rheumatoid arthritis, left ankle and foot

  • M08.079

    Unspecified juvenile rheumatoid arthritis, unspecified ankle and foot

  • M08.08

    Unspecified juvenile rheumatoid arthritis, vertebrae

  • M08.09

    Unspecified juvenile rheumatoid arthritis, multiple sites

  • M08.0A

    Unspecified juvenile rheumatoid arthritis, other specified site

  • M08.1

    Juvenile ankylosing spondylitis

  • M08.20

    Juvenile rheumatoid arthritis with systemic onset, unspecified site

  • M08.211

    Juvenile rheumatoid arthritis with systemic onset, right shoulder

  • M08.212

    Juvenile rheumatoid arthritis with systemic onset, left shoulder

  • M08.219

    Juvenile rheumatoid arthritis with systemic onset, unspecified shoulder

  • M08.221

    Juvenile rheumatoid arthritis with systemic onset, right elbow

  • M08.222

    Juvenile rheumatoid arthritis with systemic onset, left elbow

  • M08.229

    Juvenile rheumatoid arthritis with systemic onset, unspecified elbow

  • M08.231

    Juvenile rheumatoid arthritis with systemic onset, right wrist

  • M08.232

    Juvenile rheumatoid arthritis with systemic onset, left wrist

  • M08.239

    Juvenile rheumatoid arthritis with systemic onset, unspecified wrist

  • M08.241

    Juvenile rheumatoid arthritis with systemic onset, right hand

  • M08.242

    Juvenile rheumatoid arthritis with systemic onset, left hand

  • M08.249

    Juvenile rheumatoid arthritis with systemic onset, unspecified hand

  • M08.251

    Juvenile rheumatoid arthritis with systemic onset, right hip

  • M08.252

    Juvenile rheumatoid arthritis with systemic onset, left hip

  • M08.259

    Juvenile rheumatoid arthritis with systemic onset, unspecified hip

  • M08.261

    Juvenile rheumatoid arthritis with systemic onset, right knee

  • M08.262

    Juvenile rheumatoid arthritis with systemic onset, left knee

  • M08.269

    Juvenile rheumatoid arthritis with systemic onset, unspecified knee

  • M08.271

    Juvenile rheumatoid arthritis with systemic onset, right ankle and foot

  • M08.272

    Juvenile rheumatoid arthritis with systemic onset, left ankle and foot

  • M08.279

    Juvenile rheumatoid arthritis with systemic onset, unspecified ankle and foot

  • M08.28

    Juvenile rheumatoid arthritis with systemic onset, vertebrae

  • M08.29

    Juvenile rheumatoid arthritis with systemic onset, multiple sites

  • M08.2A

    Juvenile rheumatoid arthritis with systemic onset, other specified site

  • M08.3

    Juvenile rheumatoid polyarthritis (seronegative)

  • M08.40

    Pauciarticular juvenile rheumatoid arthritis, unspecified site

  • M08.411

    Pauciarticular juvenile rheumatoid arthritis, right shoulder

  • M08.412

    Pauciarticular juvenile rheumatoid arthritis, left shoulder

  • M08.419

    Pauciarticular juvenile rheumatoid arthritis, unspecified shoulder

  • M08.421

    Pauciarticular juvenile rheumatoid arthritis, right elbow

  • M08.422

    Pauciarticular juvenile rheumatoid arthritis, left elbow

  • M08.429

    Pauciarticular juvenile rheumatoid arthritis, unspecified elbow

  • M08.431

    Pauciarticular juvenile rheumatoid arthritis, right wrist

  • M08.432

    Pauciarticular juvenile rheumatoid arthritis, left wrist

  • M08.439

    Pauciarticular juvenile rheumatoid arthritis, unspecified wrist

  • M08.441

    Pauciarticular juvenile rheumatoid arthritis, right hand

  • M08.442

    Pauciarticular juvenile rheumatoid arthritis, left hand

  • M08.449

    Pauciarticular juvenile rheumatoid arthritis, unspecified hand

  • M08.451

    Pauciarticular juvenile rheumatoid arthritis, right hip

  • M08.452

    Pauciarticular juvenile rheumatoid arthritis, left hip

  • M08.459

    Pauciarticular juvenile rheumatoid arthritis, unspecified hip

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