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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  • M36—

    Systemic disorders of connective tissue in diseases classified elsewhere

  • 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—

    Kyphosis and lordosis

  • M40.0—

    Postural kyphosis

  • M40.00—

    Postural kyphosis, site unspecified

  • M40.03—

    Postural kyphosis, cervicothoracic region

  • M40.04—

    Postural kyphosis, thoracic region

  • M40.05—

    Postural kyphosis, thoracolumbar region

  • M40.1—

    Other secondary kyphosis

  • M40.10—

    Other secondary kyphosis, site unspecified

  • M40.12—

    Other secondary kyphosis, cervical region

  • M40.13—

    Other secondary kyphosis, cervicothoracic region

  • M40.14—

    Other secondary kyphosis, thoracic region

  • M40.15—

    Other secondary kyphosis, thoracolumbar region

  • M40.2—

    Other and unspecified kyphosis

  • M40.20—

    Unspecified kyphosis

  • M40.202—

    Unspecified kyphosis, cervical region

  • M40.203—

    Unspecified kyphosis, cervicothoracic region

  • M40.204—

    Unspecified kyphosis, thoracic region

  • M40.205—

    Unspecified kyphosis, thoracolumbar region

  • M40.209—

    Unspecified kyphosis, site unspecified

  • M40.29—

    Other kyphosis

  • M40.292—

    Other kyphosis, cervical region

  • M40.293—

    Other kyphosis, cervicothoracic region

  • M40.294—

    Other kyphosis, thoracic region

  • M40.295—

    Other kyphosis, thoracolumbar region

  • M40.299—

    Other kyphosis, site unspecified

  • M40.3—

    Flatback syndrome

  • M40.30—

    Flatback syndrome, site unspecified

  • M40.35—

    Flatback syndrome, thoracolumbar region

  • M40.36—

    Flatback syndrome, lumbar region

  • M40.37—

    Flatback syndrome, lumbosacral region

  • M40.4—

    Postural lordosis

  • M40.40—

    Postural lordosis, site unspecified

  • M40.45—

    Postural lordosis, thoracolumbar region

  • M40.46—

    Postural lordosis, lumbar region

  • M40.47—

    Postural lordosis, lumbosacral region

  • M40.5—

    Lordosis, unspecified

  • M40.50—

    Lordosis, unspecified, site unspecified

  • M40.55—

    Lordosis, unspecified, thoracolumbar region

  • M40.56—

    Lordosis, unspecified, lumbar region

  • M40.57—

    Lordosis, unspecified, lumbosacral region

  • M41—

    Scoliosis

  • M41.0—

    Infantile idiopathic scoliosis

  • M41.00—

    Infantile idiopathic scoliosis, site unspecified

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