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
PrevNext
  • M21.759—

    Unequal limb length (acquired), unspecified femur

  • M21.76—

    Unequal limb length (acquired), tibia and fibula

  • 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

  • M21.8—

    Other specified acquired deformities of limbs

  • M21.80—

    Other specified acquired deformities of unspecified limb

  • M21.82—

    Other specified acquired deformities of upper arm

  • 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

  • M21.83—

    Other specified acquired deformities of forearm

  • 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

  • M21.85—

    Other specified acquired deformities of thigh

  • 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

  • M21.86—

    Other specified acquired deformities of lower leg

  • 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

  • M21.9—

    Unspecified acquired deformity of limb and hand

  • M21.90—

    Unspecified acquired deformity of unspecified limb

  • M21.92—

    Unspecified acquired deformity of upper arm

  • 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

  • M21.93—

    Unspecified acquired deformity of forearm

  • M21.931—

    Unspecified acquired deformity of right forearm

  • M21.932—

    Unspecified acquired deformity of left forearm

  • M21.939—

    Unspecified acquired deformity of unspecified forearm

  • M21.94—

    Unspecified acquired deformity of hand

  • M21.941—

    Unspecified acquired deformity of hand, right hand

  • M21.942—

    Unspecified acquired deformity of hand, left hand

  • M21.949—

    Unspecified acquired deformity of hand, unspecified hand

  • M21.95—

    Unspecified acquired deformity of thigh

  • M21.951—

    Unspecified acquired deformity of right thigh

  • M21.952—

    Unspecified acquired deformity of left thigh

  • M21.959—

    Unspecified acquired deformity of unspecified thigh

  • M21.96—

    Unspecified acquired deformity of lower leg

  • M21.961—

    Unspecified acquired deformity of right lower leg

  • M21.962—

    Unspecified acquired deformity of left lower leg

  • M21.969—

    Unspecified acquired deformity of unspecified lower leg

  • M22—

    Disorder of patella

  • M22.0—

    Recurrent dislocation of patella

  • M22.00—

    Recurrent dislocation of patella, unspecified knee

PreviousPage 47 of 174Next