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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  • M21.542—

    Acquired clubfoot, left foot

  • M21.549—

    Acquired clubfoot, unspecified foot

  • M21.611—

    Bunion of right foot

  • M21.612—

    Bunion of left foot

  • M21.619—

    Bunion of unspecified foot

  • M21.621—

    Bunionette of right foot

  • M21.622—

    Bunionette of left foot

  • M21.629—

    Bunionette of unspecified foot

  • M21.6X1—

    Other acquired deformities of right foot

  • M21.6X2—

    Other acquired deformities of left foot

  • M21.6X9—

    Other acquired deformities of unspecified foot

  • M21.70—

    Unequal limb length (acquired), unspecified site

  • M21.721—

    Unequal limb length (acquired), right humerus

  • M21.722—

    Unequal limb length (acquired), left humerus

  • M21.729—

    Unequal limb length (acquired), unspecified humerus

  • M21.731—

    Unequal limb length (acquired), right ulna

  • M21.732—

    Unequal limb length (acquired), left ulna

  • M21.733—

    Unequal limb length (acquired), right radius

  • M21.734—

    Unequal limb length (acquired), left radius

  • M21.739—

    Unequal limb length (acquired), unspecified ulna and radius

  • M21.751—

    Unequal limb length (acquired), right femur

  • M21.752—

    Unequal limb length (acquired), left femur

  • M21.759—

    Unequal limb length (acquired), unspecified femur

  • M21.761—

    Unequal limb length (acquired), right tibia

  • M21.762—

    Unequal limb length (acquired), left tibia

  • M21.763—

    Unequal limb length (acquired), right fibula

  • M21.764—

    Unequal limb length (acquired), left fibula

  • M21.769—

    Unequal limb length (acquired), unspecified tibia and fibula

  • M21.80—

    Other specified acquired deformities of unspecified limb

  • M21.821—

    Other specified acquired deformities of right upper arm

  • M21.822—

    Other specified acquired deformities of left upper arm

  • M21.829—

    Other specified acquired deformities of unspecified upper arm

  • M21.831—

    Other specified acquired deformities of right forearm

  • M21.832—

    Other specified acquired deformities of left forearm

  • M21.839—

    Other specified acquired deformities of unspecified forearm

  • M21.851—

    Other specified acquired deformities of right thigh

  • M21.852—

    Other specified acquired deformities of left thigh

  • M21.859—

    Other specified acquired deformities of unspecified thigh

  • M21.861—

    Other specified acquired deformities of right lower leg

  • M21.862—

    Other specified acquired deformities of left lower leg

  • M21.869—

    Other specified acquired deformities of unspecified lower leg

  • M21.90—

    Unspecified acquired deformity of unspecified limb

  • M21.921—

    Unspecified acquired deformity of right upper arm

  • M21.922—

    Unspecified acquired deformity of left upper arm

  • M21.929—

    Unspecified acquired deformity of unspecified upper arm

  • M21.931—

    Unspecified acquired deformity of right forearm

  • M21.932—

    Unspecified acquired deformity of left forearm

  • M21.939—

    Unspecified acquired deformity of unspecified forearm

  • M21.941—

    Unspecified acquired deformity of hand, right hand

  • M21.942—

    Unspecified acquired deformity of hand, left hand

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