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.2290

    Drug-induced chronic gout, unspecified elbow, without tophus (tophi)

  • M1A.2291

    Drug-induced chronic gout, unspecified elbow, with tophus (tophi)

  • M1A.231

    Drug-induced chronic gout, right wrist

  • M1A.2310

    Drug-induced chronic gout, right wrist, without tophus (tophi)

  • M1A.2311

    Drug-induced chronic gout, right wrist, with tophus (tophi)

  • M1A.232

    Drug-induced chronic gout, left wrist

  • M1A.2320

    Drug-induced chronic gout, left wrist, without tophus (tophi)

  • M1A.2321

    Drug-induced chronic gout, left wrist, with tophus (tophi)

  • M1A.239

    Drug-induced chronic gout, unspecified wrist

  • M1A.2390

    Drug-induced chronic gout, unspecified wrist, without tophus (tophi)

  • M1A.2391

    Drug-induced chronic gout, unspecified wrist, with tophus (tophi)

  • M1A.241

    Drug-induced chronic gout, right hand

  • M1A.2410

    Drug-induced chronic gout, right hand, without tophus (tophi)

  • M1A.2411

    Drug-induced chronic gout, right hand, with tophus (tophi)

  • M1A.242

    Drug-induced chronic gout, left hand

  • M1A.2420

    Drug-induced chronic gout, left hand, without tophus (tophi)

  • M1A.2421

    Drug-induced chronic gout, left hand, with tophus (tophi)

  • M1A.249

    Drug-induced chronic gout, unspecified hand

  • M1A.2490

    Drug-induced chronic gout, unspecified hand, without tophus (tophi)

  • M1A.2491

    Drug-induced chronic gout, unspecified hand, with tophus (tophi)

  • M1A.251

    Drug-induced chronic gout, right hip

  • M1A.2510

    Drug-induced chronic gout, right hip, without tophus (tophi)

  • M1A.2511

    Drug-induced chronic gout, right hip, with tophus (tophi)

  • M1A.252

    Drug-induced chronic gout, left hip

  • M1A.2520

    Drug-induced chronic gout, left hip, without tophus (tophi)

  • M1A.2521

    Drug-induced chronic gout, left hip, with tophus (tophi)

  • M1A.259

    Drug-induced chronic gout, unspecified hip

  • M1A.2590

    Drug-induced chronic gout, unspecified hip, without tophus (tophi)

  • M1A.2591

    Drug-induced chronic gout, unspecified hip, with tophus (tophi)

  • M1A.261

    Drug-induced chronic gout, right knee

  • M1A.2610

    Drug-induced chronic gout, right knee, without tophus (tophi)

  • M1A.2611

    Drug-induced chronic gout, right knee, with tophus (tophi)

  • M1A.262

    Drug-induced chronic gout, left knee

  • M1A.2620

    Drug-induced chronic gout, left knee, without tophus (tophi)

  • M1A.2621

    Drug-induced chronic gout, left knee, with tophus (tophi)

  • M1A.269

    Drug-induced chronic gout, unspecified knee

  • M1A.2690

    Drug-induced chronic gout, unspecified knee, without tophus (tophi)

  • M1A.2691

    Drug-induced chronic gout, unspecified knee, with tophus (tophi)

  • M1A.271

    Drug-induced chronic gout, right ankle and foot

  • M1A.2710

    Drug-induced chronic gout, right ankle and foot, without tophus (tophi)

  • M1A.2711

    Drug-induced chronic gout, right ankle and foot, with tophus (tophi)

  • M1A.272

    Drug-induced chronic gout, left ankle and foot

  • M1A.2720

    Drug-induced chronic gout, left ankle and foot, without tophus (tophi)

  • M1A.2721

    Drug-induced chronic gout, left ankle and foot, with tophus (tophi)

  • M1A.279

    Drug-induced chronic gout, unspecified ankle and foot

  • M1A.2790

    Drug-induced chronic gout, unspecified ankle and foot, without tophus (tophi)

  • M1A.2791

    Drug-induced chronic gout, unspecified ankle and foot, with tophus (tophi)

  • M1A.28

    Drug-induced chronic gout, vertebrae

  • M1A.28X0

    Drug-induced chronic gout, vertebrae, without tophus (tophi)

  • M1A.28X1

    Drug-induced chronic gout, vertebrae, with tophus (tophi)

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