Deforming dorsopathies (M40-M43) ICD-10-CM
The M40–M43 section covers deforming dorsopathies with 187 ICD-10-CM diagnosis codes, of which 157 are billable in fiscal year 2027. The section is organized into the 4 code ranges listed below.
Code Ranges in This Section 4 ranges · 187 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| M40 | Kyphosis and lordosis (M40) | 40 | 31 |
| M41 | Scoliosis (M41) | 65 | 55 |
| M42 | Spinal osteochondrosis (M42) | 24 | 21 |
| M43 | Other deforming dorsopathies (M43) | 58 | 50 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the M40–M43 Code Range
These conditions involve changes in the shape or alignment of the spine. They include spinal curvatures, spinal osteochondrosis, and other deforming back conditions.
M40 groups kyphosis and lordosis by postural, secondary, other, or unspecified forms and includes flatback syndrome. M41 covers scoliosis, a sideways deviation of the spine. Its subdivisions distinguish infantile, juvenile and adolescent idiopathic forms from thoracogenic, neuromuscular, secondary, and other forms.
M42 covers spinal osteochondrosis, a bone disorder involving the spine’s centers of bone formation. It separates juvenile, adult, and unspecified forms. M43 groups other deforming back conditions, including spinal fusion and recurrent vertebral dislocation.
Questions About This Page
How many codes are in the M40-M43 range?
The M40-M43 range contains 187 ICD-10-CM diagnosis codes in FY 2027. 157 of them are billable, and the rest are category headers that organize the section.
What conditions does M40-M43 cover?
The range covers deforming dorsopathies. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
