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
  • M1A.461—

    Other secondary chronic gout, right knee

  • M1A.4610—

    Other secondary chronic gout, right knee, without tophus (tophi)

  • M1A.4611—

    Other secondary chronic gout, right knee, with tophus (tophi)

  • M1A.462—

    Other secondary chronic gout, left knee

  • M1A.4620—

    Other secondary chronic gout, left knee, without tophus (tophi)

  • M1A.4621—

    Other secondary chronic gout, left knee, with tophus (tophi)

  • M1A.469—

    Other secondary chronic gout, unspecified knee

  • M1A.4690—

    Other secondary chronic gout, unspecified knee, without tophus (tophi)

  • M1A.4691—

    Other secondary chronic gout, unspecified knee, with tophus (tophi)

  • M1A.47—

    Other secondary chronic gout, ankle and foot

  • M1A.471—

    Other secondary chronic gout, right ankle and foot

  • M1A.4710—

    Other secondary chronic gout, right ankle and foot, without tophus (tophi)

  • M1A.4711—

    Other secondary chronic gout, right ankle and foot, with tophus (tophi)

  • M1A.472—

    Other secondary chronic gout, left ankle and foot

  • M1A.4720—

    Other secondary chronic gout, left ankle and foot, without tophus (tophi)

  • M1A.4721—

    Other secondary chronic gout, left ankle and foot, with tophus (tophi)

  • M1A.479—

    Other secondary chronic gout, unspecified ankle and foot

  • M1A.4790—

    Other secondary chronic gout, unspecified ankle and foot, without tophus (tophi)

  • M1A.4791—

    Other secondary chronic gout, unspecified ankle and foot, with tophus (tophi)

  • M1A.48—

    Other secondary chronic gout, vertebrae

  • M1A.48X0—

    Other secondary chronic gout, vertebrae, without tophus (tophi)

  • M1A.48X1—

    Other secondary chronic gout, vertebrae, with tophus (tophi)

  • M1A.49—

    Other secondary chronic gout, multiple sites

  • M1A.49X0—

    Other secondary chronic gout, multiple sites, without tophus (tophi)

  • M1A.49X1—

    Other secondary chronic gout, multiple sites, with tophus (tophi)

  • M1A.9—

    Chronic gout, unspecified

  • M1A.9XX0—

    Chronic gout, unspecified, without tophus (tophi)

  • M1A.9XX1—

    Chronic gout, unspecified, with tophus (tophi)

  • M20—

    Acquired deformities of fingers and toes

  • M20.0—

    Deformity of finger(s)

  • M20.00—

    Unspecified deformity of finger(s)

  • M20.001—

    Unspecified deformity of right finger(s)

  • M20.002—

    Unspecified deformity of left finger(s)

  • M20.009—

    Unspecified deformity of unspecified finger(s)

  • M20.01—

    Mallet finger

  • M20.011—

    Mallet finger of right finger(s)

  • M20.012—

    Mallet finger of left finger(s)

  • M20.019—

    Mallet finger of unspecified finger(s)

  • M20.02—

    Boutonnière deformity

  • M20.021—

    Boutonnière deformity of right finger(s)

  • M20.022—

    Boutonnière deformity of left finger(s)

  • M20.029—

    Boutonnière deformity of unspecified finger(s)

  • M20.03—

    Swan-neck deformity

  • 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)

  • M20.09—

    Other deformity of 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)

PreviousPage 43 of 174Next