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)
Internal Codes
  • M1A.031

    Idiopathic chronic gout, right wrist

  • M1A.0310

    Idiopathic chronic gout, right wrist, without tophus (tophi)

  • M1A.0311

    Idiopathic chronic gout, right wrist, with tophus (tophi)

  • M1A.032

    Idiopathic chronic gout, left wrist

  • M1A.0320

    Idiopathic chronic gout, left wrist, without tophus (tophi)

  • M1A.0321

    Idiopathic chronic gout, left wrist, with tophus (tophi)

  • M1A.039

    Idiopathic chronic gout, unspecified wrist

  • M1A.0390

    Idiopathic chronic gout, unspecified wrist, without tophus (tophi)

  • M1A.0391

    Idiopathic chronic gout, unspecified wrist, with tophus (tophi)

  • M1A.04

    Idiopathic chronic gout, hand

  • M1A.041

    Idiopathic chronic gout, right hand

  • M1A.0410

    Idiopathic chronic gout, right hand, without tophus (tophi)

  • M1A.0411

    Idiopathic chronic gout, right hand, with tophus (tophi)

  • M1A.042

    Idiopathic chronic gout, left hand

  • M1A.0420

    Idiopathic chronic gout, left hand, without tophus (tophi)

  • M1A.0421

    Idiopathic chronic gout, left hand, with tophus (tophi)

  • M1A.049

    Idiopathic chronic gout, unspecified hand

  • M1A.0490

    Idiopathic chronic gout, unspecified hand, without tophus (tophi)

  • M1A.0491

    Idiopathic chronic gout, unspecified hand, with tophus (tophi)

  • M1A.05

    Idiopathic chronic gout, hip

  • M1A.051

    Idiopathic chronic gout, right hip

  • M1A.0510

    Idiopathic chronic gout, right hip, without tophus (tophi)

  • M1A.0511

    Idiopathic chronic gout, right hip, with tophus (tophi)

  • M1A.052

    Idiopathic chronic gout, left hip

  • M1A.0520

    Idiopathic chronic gout, left hip, without tophus (tophi)

  • M1A.0521

    Idiopathic chronic gout, left hip, with tophus (tophi)

  • M1A.059

    Idiopathic chronic gout, unspecified hip

  • M1A.0590

    Idiopathic chronic gout, unspecified hip, without tophus (tophi)

  • M1A.0591

    Idiopathic chronic gout, unspecified hip, with tophus (tophi)

  • M1A.06

    Idiopathic chronic gout, knee

  • M1A.061

    Idiopathic chronic gout, right knee

  • M1A.0610

    Idiopathic chronic gout, right knee, without tophus (tophi)

  • M1A.0611

    Idiopathic chronic gout, right knee, with tophus (tophi)

  • M1A.062

    Idiopathic chronic gout, left knee

  • M1A.0620

    Idiopathic chronic gout, left knee, without tophus (tophi)

  • M1A.0621

    Idiopathic chronic gout, left knee, with tophus (tophi)

  • M1A.069

    Idiopathic chronic gout, unspecified knee

  • M1A.0690

    Idiopathic chronic gout, unspecified knee, without tophus (tophi)

  • M1A.0691

    Idiopathic chronic gout, unspecified knee, with tophus (tophi)

  • M1A.07

    Idiopathic chronic gout, ankle and foot

  • M1A.071

    Idiopathic chronic gout, right ankle and foot

  • M1A.0710

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

  • M1A.0711

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

  • M1A.072

    Idiopathic chronic gout, left ankle and foot

  • M1A.0720

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

  • M1A.0721

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

  • M1A.079

    Idiopathic chronic gout, unspecified ankle and foot

  • M1A.0790

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

  • M1A.0791

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

  • M1A.08

    Idiopathic chronic gout, vertebrae

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