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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  • M20.001—

    Unspecified deformity of right finger(s)

  • M20.002—

    Unspecified deformity of left finger(s)

  • M20.009—

    Unspecified deformity of unspecified finger(s)

  • M20.011—

    Mallet finger of right finger(s)

  • M20.012—

    Mallet finger of left finger(s)

  • M20.019—

    Mallet finger of unspecified finger(s)

  • M20.021—

    Boutonnière deformity of right finger(s)

  • M20.022—

    Boutonnière deformity of left finger(s)

  • M20.029—

    Boutonnière deformity of unspecified finger(s)

  • M20.031—

    Swan-neck deformity of right finger(s)

  • M20.032—

    Swan-neck deformity of left finger(s)

  • M20.039—

    Swan-neck deformity of unspecified finger(s)

  • M20.091—

    Other deformity of right finger(s)

  • M20.092—

    Other deformity of left finger(s)

  • M20.099—

    Other deformity of finger(s), unspecified finger(s)

  • M20.10—

    Hallux valgus (acquired), unspecified foot

  • M20.11—

    Hallux valgus (acquired), right foot

  • M20.12—

    Hallux valgus (acquired), left foot

  • M20.20—

    Hallux rigidus, unspecified foot

  • M20.21—

    Hallux rigidus, right foot

  • M20.22—

    Hallux rigidus, left foot

  • M20.30—

    Hallux varus (acquired), unspecified foot

  • M20.31—

    Hallux varus (acquired), right foot

  • M20.32—

    Hallux varus (acquired), left foot

  • M20.40—

    Other hammer toe(s) (acquired), unspecified foot

  • M20.41—

    Other hammer toe(s) (acquired), right foot

  • M20.42—

    Other hammer toe(s) (acquired), left foot

  • M20.5X1—

    Other deformities of toe(s) (acquired), right foot

  • M20.5X2—

    Other deformities of toe(s) (acquired), left foot

  • M20.5X9—

    Other deformities of toe(s) (acquired), unspecified foot

  • M20.60—

    Acquired deformities of toe(s), unspecified, unspecified foot

  • M20.61—

    Acquired deformities of toe(s), unspecified, right foot

  • M20.62—

    Acquired deformities of toe(s), unspecified, left foot

  • M21.00—

    Valgus deformity, not elsewhere classified, unspecified site

  • M21.021—

    Valgus deformity, not elsewhere classified, right elbow

  • M21.022—

    Valgus deformity, not elsewhere classified, left elbow

  • M21.029—

    Valgus deformity, not elsewhere classified, unspecified elbow

  • M21.051—

    Valgus deformity, not elsewhere classified, right hip

  • M21.052—

    Valgus deformity, not elsewhere classified, left hip

  • M21.059—

    Valgus deformity, not elsewhere classified, unspecified hip

  • M21.061—

    Valgus deformity, not elsewhere classified, right knee

  • M21.062—

    Valgus deformity, not elsewhere classified, left knee

  • M21.069—

    Valgus deformity, not elsewhere classified, unspecified knee

  • M21.071—

    Valgus deformity, not elsewhere classified, right ankle

  • M21.072—

    Valgus deformity, not elsewhere classified, left ankle

  • M21.079—

    Valgus deformity, not elsewhere classified, unspecified ankle

  • M21.10—

    Varus deformity, not elsewhere classified, unspecified site

  • M21.121—

    Varus deformity, not elsewhere classified, right elbow

  • M21.122—

    Varus deformity, not elsewhere classified, left elbow

  • M21.129—

    Varus deformity, not elsewhere classified, unspecified elbow

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