Other deforming dorsopathies (M43) ICD-10-CM
The M43 code range covers other deforming dorsopathies with 58 ICD-10-CM diagnosis codes. 50 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the M43 Range 58 codes · 50 billable
- M43 Other deforming dorsopathiesNon-billable
- M43.0 SpondylolysisNon-billable
- M43.00 Spondylolysis, site unspecified
- M43.01 Spondylolysis, occipito-atlanto-axial region
- M43.02 Spondylolysis, cervical region
- M43.03 Spondylolysis, cervicothoracic region
- M43.04 Spondylolysis, thoracic region
- M43.05 Spondylolysis, thoracolumbar region
- M43.06 Spondylolysis, lumbar region
- M43.07 Spondylolysis, lumbosacral region
- M43.08 Spondylolysis, sacral and sacrococcygeal region
- M43.09 Spondylolysis, multiple sites in spine
- M43.1 SpondylolisthesisNon-billable
- M43.10 Spondylolisthesis, site unspecified
- 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 spineNon-billable
- 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 dislocationNon-billable
- M43.5X Other recurrent vertebral dislocationNon-billable
- 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 dorsopathiesNon-billable
- M43.8X Other specified deforming dorsopathiesNon-billable
- 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
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the M43 range.
Spondylolisthesis
Forward displacement of a superior vertebral body over the vertebral body below.
Spondylolysis
Deficient development or degeneration of a portion of the VERTEBRA, usually in the pars interarticularis (the bone bridge between the superior and inferior facet joints of the LUMBAR VERTEBRAE) leading to SPONDYLOLISTHESIS.
Torticollis
A symptom, not a disease, of a twisted neck. In most instances, the head is tipped toward one side and the chin rotated toward the other. The involuntary muscle contractions in the neck region of patients with torticollis can be due to congenital defects, trauma, inflammation, tumors, and neurological or other factors.
About the M43 Code Range
These conditions involve deformities of the back and spine, including spine fusion and recurring dislocation.
The branches distinguish spondylolysis (M43.0), spondylolisthesis (M43.1), and spine fusion (M43.2). Each then splits by spinal region or an unspecified site; the first two also have codes for multiple spinal sites. Other branches distinguish recurring dislocation by location and, for atlantoaxial dislocation, whether myelopathy is named. Separate codes identify torticollis (M43.6), other specified deforming back conditions, and an unspecified deforming back condition.
Questions About This Page
How many billable codes are in the M43 range?
Of the 58 codes in this range, 50 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the M43 range classify?
The range classifies other deforming dorsopathies. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
