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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  • M1A.3591—

    Chronic gout due to renal impairment, unspecified hip, with tophus (tophi)

  • M1A.361—

    Chronic gout due to renal impairment, right knee

  • M1A.3610—

    Chronic gout due to renal impairment, right knee, without tophus (tophi)

  • M1A.3611—

    Chronic gout due to renal impairment, right knee, with tophus (tophi)

  • M1A.362—

    Chronic gout due to renal impairment, left knee

  • M1A.3620—

    Chronic gout due to renal impairment, left knee, without tophus (tophi)

  • M1A.3621—

    Chronic gout due to renal impairment, left knee, with tophus (tophi)

  • M1A.369—

    Chronic gout due to renal impairment, unspecified knee

  • M1A.3690—

    Chronic gout due to renal impairment, unspecified knee, without tophus (tophi)

  • M1A.3691—

    Chronic gout due to renal impairment, unspecified knee, with tophus (tophi)

  • M1A.371—

    Chronic gout due to renal impairment, right ankle and foot

  • M1A.3710—

    Chronic gout due to renal impairment, right ankle and foot, without tophus (tophi)

  • M1A.3711—

    Chronic gout due to renal impairment, right ankle and foot, with tophus (tophi)

  • M1A.372—

    Chronic gout due to renal impairment, left ankle and foot

  • M1A.3720—

    Chronic gout due to renal impairment, left ankle and foot, without tophus (tophi)

  • M1A.3721—

    Chronic gout due to renal impairment, left ankle and foot, with tophus (tophi)

  • M1A.379—

    Chronic gout due to renal impairment, unspecified ankle and foot

  • M1A.3790—

    Chronic gout due to renal impairment, unspecified ankle and foot, without tophus (tophi)

  • M1A.3791—

    Chronic gout due to renal impairment, unspecified ankle and foot, with tophus (tophi)

  • M1A.38—

    Chronic gout due to renal impairment, vertebrae

  • M1A.38X0—

    Chronic gout due to renal impairment, vertebrae, without tophus (tophi)

  • M1A.38X1—

    Chronic gout due to renal impairment, vertebrae, with tophus (tophi)

  • M1A.39—

    Chronic gout due to renal impairment, multiple sites

  • M1A.39X0—

    Chronic gout due to renal impairment, multiple sites, without tophus (tophi)

  • M1A.39X1—

    Chronic gout due to renal impairment, multiple sites, with tophus (tophi)

  • M1A.40—

    Other secondary chronic gout, unspecified site

  • M1A.40X0—

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

  • M1A.40X1—

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

  • M1A.411—

    Other secondary chronic gout, right shoulder

  • M1A.4110—

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

  • M1A.4111—

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

  • M1A.412—

    Other secondary chronic gout, left shoulder

  • M1A.4120—

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

  • M1A.4121—

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

  • M1A.419—

    Other secondary chronic gout, unspecified shoulder

  • M1A.4190—

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

  • M1A.4191—

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

  • M1A.421—

    Other secondary chronic gout, right elbow

  • M1A.4210—

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

  • M1A.4211—

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

  • M1A.422—

    Other secondary chronic gout, left elbow

  • M1A.4220—

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

  • M1A.4221—

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

  • M1A.429—

    Other secondary chronic gout, unspecified elbow

  • M1A.4290—

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

  • M1A.4291—

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

  • M1A.431—

    Other secondary chronic gout, right wrist

  • M1A.4310—

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

  • M1A.4311—

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

  • M1A.432—

    Other secondary chronic gout, left wrist

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