2026 ICD-10-CM Diagnosis Code M40.205Unspecified kyphosis, thoracolumbar region

ICD-10-CM Codes›M00–M99›M40-M43›M40

ICD-10-CM M40.205
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M40.205 is a billable ICD-10-CM diagnosis code for unspecified kyphosis, thoracolumbar region. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 456 through 458, 551 through 552. Coders also document this condition as kyphosis of thoracolumbar spine. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Scoliosis and other postural dorsopathic deformities.

Code Identity

ICD-10-CM Code
M40.205
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified kyphosis, thoracolumbar region
Short Description
Unspecified kyphosis, thoracolumbar region
Same as the full description in the CMS dataset.
Parent Code
M40.20
Unspecified kyphosis

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM40-M43Deforming dorsopathies
CategoryM40Kyphosis and lordosis
This CodeM40.205Unspecified kyphosis, thoracolumbar region

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Kyphosis of thoracolumbar spine

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Kyphosis, kyphotic(acquired)
      • thoracolumbar region

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS022
Scoliosis and other postural dorsopathic deformities
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Kyphosis

    deformities of the spine characterized by an exaggerated convexity of the vertebral column. the forward bending of the thoracic region usually is more than 40 degrees. this deformity sometimes is called round back or hunchback.

  • Scheuermann Disease

    a type of juvenile osteochondrosis affecting the fibrocartilaginous disc (intervertebral disc) in the thoracic or thoracolumbar region of the spine. it is characterized by a forward concave spinal curvature or kyphosis.

  • Spine

    the spinal or vertebral column.

Patient EducationClinical

Spine Injuries and Disorders

Your backbone, or spine, is made up of 26 bone discs called vertebrae. The vertebrae protect your spinal cord and allow you to stand and bend. A number of problems can change the structure of the spine or damage the vertebrae and surrounding tissue. They include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert M40.205 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
737.10 Kyphosis NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M40.205Overview

Is M40.205 (Unspecified kyphosis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified kyphosis, thoracolumbar region on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M40.205 group to?

When unspecified kyphosis, thoracolumbar region is the principal diagnosis on an inpatient stay, it groups to MS-DRG 456, 457, 458, 551, 552, with relative weights from 0.9613 to 8.4034 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M40.205?

Under the General Equivalence Mappings, unspecified kyphosis, thoracolumbar region converts to ICD-9-CM 737.10 (kyphosis NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.