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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  • M43.8X7—

    Other specified deforming dorsopathies, lumbosacral region

  • M43.8X8—

    Other specified deforming dorsopathies, sacral and sacrococcygeal region

  • M43.8X9—

    Other specified deforming dorsopathies, site unspecified

  • M43.9—

    Deforming dorsopathy, unspecified

  • M45.0—

    Ankylosing spondylitis of multiple sites in spine

  • M45.1—

    Ankylosing spondylitis of occipito-atlanto-axial region

  • M45.2—

    Ankylosing spondylitis of cervical region

  • M45.3—

    Ankylosing spondylitis of cervicothoracic region

  • M45.4—

    Ankylosing spondylitis of thoracic region

  • M45.5—

    Ankylosing spondylitis of thoracolumbar region

  • M45.6—

    Ankylosing spondylitis lumbar region

  • M45.7—

    Ankylosing spondylitis of lumbosacral region

  • M45.8—

    Ankylosing spondylitis sacral and sacrococcygeal region

  • M45.9—

    Ankylosing spondylitis of unspecified sites in spine

  • M45.A0—

    Non-radiographic axial spondyloarthritis of unspecified sites in spine

  • M45.A1—

    Non-radiographic axial spondyloarthritis of occipito-atlanto-axial region

  • M45.A2—

    Non-radiographic axial spondyloarthritis of cervical region

  • M45.A3—

    Non-radiographic axial spondyloarthritis of cervicothoracic region

  • M45.A4—

    Non-radiographic axial spondyloarthritis of thoracic region

  • M45.A5—

    Non-radiographic axial spondyloarthritis of thoracolumbar region

  • M45.A6—

    Non-radiographic axial spondyloarthritis of lumbar region

  • M45.A7—

    Non-radiographic axial spondyloarthritis of lumbosacral region

  • M45.A8—

    Non-radiographic axial spondyloarthritis of sacral and sacrococcygeal region

  • M45.AB—

    Non-radiographic axial spondyloarthritis of multiple sites in spine

  • M46.00—

    Spinal enthesopathy, site unspecified

  • M46.01—

    Spinal enthesopathy, occipito-atlanto-axial region

  • M46.02—

    Spinal enthesopathy, cervical region

  • M46.03—

    Spinal enthesopathy, cervicothoracic region

  • M46.04—

    Spinal enthesopathy, thoracic region

  • M46.05—

    Spinal enthesopathy, thoracolumbar region

  • M46.06—

    Spinal enthesopathy, lumbar region

  • M46.07—

    Spinal enthesopathy, lumbosacral region

  • M46.08—

    Spinal enthesopathy, sacral and sacrococcygeal region

  • M46.09—

    Spinal enthesopathy, multiple sites in spine

  • M46.1—

    Sacroiliitis, not elsewhere classified

  • M46.20—

    Osteomyelitis of vertebra, site unspecified

  • M46.21—

    Osteomyelitis of vertebra, occipito-atlanto-axial region

  • M46.22—

    Osteomyelitis of vertebra, cervical region

  • M46.23—

    Osteomyelitis of vertebra, cervicothoracic region

  • M46.24—

    Osteomyelitis of vertebra, thoracic region

  • M46.25—

    Osteomyelitis of vertebra, thoracolumbar region

  • M46.26—

    Osteomyelitis of vertebra, lumbar region

  • M46.27—

    Osteomyelitis of vertebra, lumbosacral region

  • M46.28—

    Osteomyelitis of vertebra, sacral and sacrococcygeal region

  • M46.30—

    Infection of intervertebral disc (pyogenic), site unspecified

  • M46.31—

    Infection of intervertebral disc (pyogenic), occipito-atlanto-axial region

  • M46.32—

    Infection of intervertebral disc (pyogenic), cervical region

  • M46.33—

    Infection of intervertebral disc (pyogenic), cervicothoracic region

  • M46.34—

    Infection of intervertebral disc (pyogenic), thoracic region

  • M46.35—

    Infection of intervertebral disc (pyogenic), thoracolumbar region

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