2026 ICD-10-CM Diagnosis Code M24.28Disorder of ligament, vertebrae

ICD-10-CM Codes›M00–M99›M20-M25›M24

ICD-10-CM M24.28
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M24.28 is a billable ICD-10-CM diagnosis code for disorder of ligament, vertebrae. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 557 through 558. Coders also document this condition as calcification of ligament. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified joint disorders.

Code Identity

ICD-10-CM Code
M24.28
Billable Status
Yes — Valid for Submission
Code Describes
Disorder of ligament, vertebrae
Short Description
Disorder of ligament, vertebrae
Same as the full description in the CMS dataset.
Parent Code
M24.2
Disorder of ligament

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM20-M25Other joint disorders
CategoryM24Other specific joint derangements
This CodeM24.28Disorder of ligament, vertebrae

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Calcification of ligament
  • Disorder of ligament of vertebral joint
  • Heterotopic ossification of joint
  • Ossification of spinal ligament

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.

    • Disorder(of)
      • ligament
        • vertebra

Clinical ClassificationClinical

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

CCSR MUS007
Other specified joint disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

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 M24.28 to ICD-9-CMHistory

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

ICD-9-CM
728.4 Laxity of ligament
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 M24.28Overview

Is M24.28 (Disorder of ligament) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report disorder of ligament, vertebrae on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M24.28 group to?

When disorder of ligament, vertebrae is the principal diagnosis on an inpatient stay, it groups to MS-DRG 557, 558, with relative weights from 0.8932 to 1.4869 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M24.28?

Under the General Equivalence Mappings, disorder of ligament, vertebrae converts to ICD-9-CM 728.4 (laxity of ligament). 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.