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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  • M43.11—

    Spondylolisthesis, occipito-atlanto-axial region

  • M43.12—

    Spondylolisthesis, cervical region

  • M43.13—

    Spondylolisthesis, cervicothoracic region

  • M43.14—

    Spondylolisthesis, thoracic region

  • M43.15—

    Spondylolisthesis, thoracolumbar region

  • M43.16—

    Spondylolisthesis, lumbar region

  • M43.17—

    Spondylolisthesis, lumbosacral region

  • M43.18—

    Spondylolisthesis, sacral and sacrococcygeal region

  • M43.19—

    Spondylolisthesis, multiple sites in spine

  • M43.2—

    Fusion of spine

  • M43.20—

    Fusion of spine, site unspecified

  • M43.21—

    Fusion of spine, occipito-atlanto-axial region

  • M43.22—

    Fusion of spine, cervical region

  • M43.23—

    Fusion of spine, cervicothoracic region

  • M43.24—

    Fusion of spine, thoracic region

  • M43.25—

    Fusion of spine, thoracolumbar region

  • M43.26—

    Fusion of spine, lumbar region

  • M43.27—

    Fusion of spine, lumbosacral region

  • M43.28—

    Fusion of spine, sacral and sacrococcygeal region

  • M43.3—

    Recurrent atlantoaxial dislocation with myelopathy

  • M43.4—

    Other recurrent atlantoaxial dislocation

  • M43.5—

    Other recurrent vertebral dislocation

  • M43.5X—

    Other recurrent vertebral dislocation

  • M43.5X2—

    Other recurrent vertebral dislocation, cervical region

  • M43.5X3—

    Other recurrent vertebral dislocation, cervicothoracic region

  • M43.5X4—

    Other recurrent vertebral dislocation, thoracic region

  • M43.5X5—

    Other recurrent vertebral dislocation, thoracolumbar region

  • M43.5X6—

    Other recurrent vertebral dislocation, lumbar region

  • M43.5X7—

    Other recurrent vertebral dislocation, lumbosacral region

  • M43.5X8—

    Other recurrent vertebral dislocation, sacral and sacrococcygeal region

  • M43.5X9—

    Other recurrent vertebral dislocation, site unspecified

  • M43.6—

    Torticollis

  • M43.8—

    Other specified deforming dorsopathies

  • M43.8X—

    Other specified deforming dorsopathies

  • M43.8X1—

    Other specified deforming dorsopathies, occipito-atlanto-axial region

  • M43.8X2—

    Other specified deforming dorsopathies, cervical region

  • M43.8X3—

    Other specified deforming dorsopathies, cervicothoracic region

  • M43.8X4—

    Other specified deforming dorsopathies, thoracic region

  • M43.8X5—

    Other specified deforming dorsopathies, thoracolumbar region

  • M43.8X6—

    Other specified deforming dorsopathies, lumbar region

  • 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—

    Ankylosing spondylitis

  • 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

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