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 2026. 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
ICD-10 codes M40-M43 cover a range of deforming dorsopathies, which are disorders causing abnormal shaping or curvature of the spine, including kyphosis, lordosis, scoliosis, spinal osteochondrosis, and other spinal deformities.
These codes are used to classify different forms of spine deformities by type and region. For example, M40 includes kyphosis and lordosis, such as postural kyphosis and flatback syndrome. Synonyms like "Postural kyphosis" or "Acquired lordosis deformity" align with these codes to assist coders identifying specific postural spine curvatures. M41 refers to scoliosis, with detailed subcodes distinguishing infantile, juvenile, adolescent, neuromuscular, and idiopathic scoliosis across spine regions like cervical, thoracic, or lumbar. Using synonyms like "Idiopathic scoliosis" and "Neuromuscular kyphosis" clarifies proper code selection. M42 captures spinal osteochondrosis (bone and cartilage disorders). M43 addresses other deforming dorsopathies including spondylolysis, spondylolisthesis, spinal fusion (ankylosis), and torticollis. These codes provide precise classification for various spinal curvature disorders and structural abnormalities, facilitating accurate medical coding and documentation of spine deformities in different anatomical areas.
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 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
