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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  • M21.379—

    Foot drop, unspecified foot

  • M21.4—

    Flat foot [pes planus] (acquired)

  • M21.40—

    Flat foot [pes planus] (acquired), unspecified foot

  • M21.41—

    Flat foot [pes planus] (acquired), right foot

  • M21.42—

    Flat foot [pes planus] (acquired), left foot

  • M21.5—

    Acquired clawhand, clubhand, clawfoot and clubfoot

  • M21.51—

    Acquired clawhand

  • M21.511—

    Acquired clawhand, right hand

  • M21.512—

    Acquired clawhand, left hand

  • M21.519—

    Acquired clawhand, unspecified hand

  • M21.52—

    Acquired clubhand

  • M21.521—

    Acquired clubhand, right hand

  • M21.522—

    Acquired clubhand, left hand

  • M21.529—

    Acquired clubhand, unspecified hand

  • M21.53—

    Acquired clawfoot

  • M21.531—

    Acquired clawfoot, right foot

  • M21.532—

    Acquired clawfoot, left foot

  • M21.539—

    Acquired clawfoot, unspecified foot

  • M21.54—

    Acquired clubfoot

  • M21.541—

    Acquired clubfoot, right foot

  • M21.542—

    Acquired clubfoot, left foot

  • M21.549—

    Acquired clubfoot, unspecified foot

  • M21.6—

    Other acquired deformities of foot

  • M21.61—

    Bunion

  • M21.611—

    Bunion of right foot

  • M21.612—

    Bunion of left foot

  • M21.619—

    Bunion of unspecified foot

  • M21.62—

    Bunionette

  • M21.621—

    Bunionette of right foot

  • M21.622—

    Bunionette of left foot

  • M21.629—

    Bunionette of unspecified foot

  • M21.6X—

    Other acquired deformities of 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

  • M21.7—

    Unequal limb length (acquired)

  • M21.70—

    Unequal limb length (acquired), unspecified site

  • M21.72—

    Unequal limb length (acquired), humerus

  • M21.721—

    Unequal limb length (acquired), right humerus

  • M21.722—

    Unequal limb length (acquired), left humerus

  • M21.729—

    Unequal limb length (acquired), unspecified humerus

  • M21.73—

    Unequal limb length (acquired), ulna and radius

  • 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

  • M21.75—

    Unequal limb length (acquired), femur

  • M21.751—

    Unequal limb length (acquired), right femur

  • M21.752—

    Unequal limb length (acquired), left femur

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