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
  • M93.819

    Other specified osteochondropathies, unspecified shoulder

  • M93.821

    Other specified osteochondropathies, right upper arm

  • M93.822

    Other specified osteochondropathies, left upper arm

  • M93.829

    Other specified osteochondropathies, unspecified upper arm

  • M93.831

    Other specified osteochondropathies, right forearm

  • M93.832

    Other specified osteochondropathies, left forearm

  • M93.839

    Other specified osteochondropathies, unspecified forearm

  • M93.841

    Other specified osteochondropathies, right hand

  • M93.842

    Other specified osteochondropathies, left hand

  • M93.849

    Other specified osteochondropathies, unspecified hand

  • M93.851

    Other specified osteochondropathies, right thigh

  • M93.852

    Other specified osteochondropathies, left thigh

  • M93.859

    Other specified osteochondropathies, unspecified thigh

  • M93.861

    Other specified osteochondropathies, right lower leg

  • M93.862

    Other specified osteochondropathies, left lower leg

  • M93.869

    Other specified osteochondropathies, unspecified lower leg

  • M93.871

    Other specified osteochondropathies, right ankle and foot

  • M93.872

    Other specified osteochondropathies, left ankle and foot

  • M93.879

    Other specified osteochondropathies, unspecified ankle and foot

  • M93.88

    Other specified osteochondropathies other

  • M93.89

    Other specified osteochondropathies multiple sites

  • M93.90

    Osteochondropathy, unspecified of unspecified site

  • M93.911

    Osteochondropathy, unspecified, right shoulder

  • M93.912

    Osteochondropathy, unspecified, left shoulder

  • M93.919

    Osteochondropathy, unspecified, unspecified shoulder

  • M93.921

    Osteochondropathy, unspecified, right upper arm

  • M93.922

    Osteochondropathy, unspecified, left upper arm

  • M93.929

    Osteochondropathy, unspecified, unspecified upper arm

  • M93.931

    Osteochondropathy, unspecified, right forearm

  • M93.932

    Osteochondropathy, unspecified, left forearm

  • M93.939

    Osteochondropathy, unspecified, unspecified forearm

  • M93.941

    Osteochondropathy, unspecified, right hand

  • M93.942

    Osteochondropathy, unspecified, left hand

  • M93.949

    Osteochondropathy, unspecified, unspecified hand

  • M93.951

    Osteochondropathy, unspecified, right thigh

  • M93.952

    Osteochondropathy, unspecified, left thigh

  • M93.959

    Osteochondropathy, unspecified, unspecified thigh

  • M93.961

    Osteochondropathy, unspecified, right lower leg

  • M93.962

    Osteochondropathy, unspecified, left lower leg

  • M93.969

    Osteochondropathy, unspecified, unspecified lower leg

  • M93.971

    Osteochondropathy, unspecified, right ankle and foot

  • M93.972

    Osteochondropathy, unspecified, left ankle and foot

  • M93.979

    Osteochondropathy, unspecified, unspecified ankle and foot

  • M93.98

    Osteochondropathy, unspecified other

  • M93.99

    Osteochondropathy, unspecified multiple sites

  • M94.0

    Chondrocostal junction syndrome [Tietze]

  • M94.1

    Relapsing polychondritis

  • M94.20

    Chondromalacia, unspecified site

  • M94.211

    Chondromalacia, right shoulder

  • M94.212

    Chondromalacia, left shoulder

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