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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  • M33.19—

    Other dermatomyositis with other organ involvement

  • M33.20—

    Polymyositis, organ involvement unspecified

  • M33.21—

    Polymyositis with respiratory involvement

  • M33.22—

    Polymyositis with myopathy

  • M33.29—

    Polymyositis with other organ involvement

  • M33.90—

    Dermatopolymyositis, unspecified, organ involvement unspecified

  • M33.91—

    Dermatopolymyositis, unspecified with respiratory involvement

  • M33.92—

    Dermatopolymyositis, unspecified with myopathy

  • M33.93—

    Dermatopolymyositis, unspecified without myopathy

  • M33.99—

    Dermatopolymyositis, unspecified with other organ involvement

  • M34.0—

    Progressive systemic sclerosis

  • M34.1—

    CR(E)ST syndrome

  • M34.2—

    Systemic sclerosis induced by drug and chemical

  • M34.81—

    Systemic sclerosis with lung involvement

  • M34.82—

    Systemic sclerosis with myopathy

  • M34.83—

    Systemic sclerosis with polyneuropathy

  • M34.89—

    Other systemic sclerosis

  • M34.9—

    Systemic sclerosis, unspecified

  • M35.00—

    Sjögren syndrome, unspecified

  • M35.01—

    Sjögren syndrome with keratoconjunctivitis

  • M35.02—

    Sjögren syndrome with lung involvement

  • M35.03—

    Sjögren syndrome with myopathy

  • M35.04—

    Sjögren syndrome with tubulo-interstitial nephropathy

  • M35.05—

    Sjögren syndrome with inflammatory arthritis

  • M35.06—

    Sjögren syndrome with peripheral nervous system involvement

  • M35.07—

    Sjögren syndrome with central nervous system involvement

  • M35.08—

    Sjögren syndrome with gastrointestinal involvement

  • M35.09—

    Sjögren syndrome with other organ involvement

  • M35.0A—

    Sjögren syndrome with glomerular disease

  • M35.0B—

    Sjögren syndrome with vasculitis

  • M35.0C—

    Sjögren syndrome with dental involvement

  • M35.1—

    Other overlap syndromes

  • M35.2—

    Behçet's disease

  • M35.3—

    Polymyalgia rheumatica

  • M35.4—

    Diffuse (eosinophilic) fasciitis

  • M35.5—

    Multifocal fibrosclerosis

  • M35.6—

    Relapsing panniculitis [Weber-Christian]

  • M35.7—

    Hypermobility syndrome

  • M35.81—

    Multisystem inflammatory syndrome

  • M35.89—

    Other specified systemic involvement of connective tissue

  • M35.9—

    Systemic involvement of connective tissue, unspecified

  • M36.0—

    Dermato(poly)myositis in neoplastic disease

  • M36.1—

    Arthropathy in neoplastic disease

  • M36.2—

    Hemophilic arthropathy

  • M36.3—

    Arthropathy in other blood disorders

  • M36.4—

    Arthropathy in hypersensitivity reactions classified elsewhere

  • M36.8—

    Systemic disorders of connective tissue in other diseases classified elsewhere

  • M40.00—

    Postural kyphosis, site unspecified

  • M40.03—

    Postural kyphosis, cervicothoracic region

  • M40.04—

    Postural kyphosis, thoracic region

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