2026 ICD-10-CM Diagnosis Code M24.60Ankylosis, unspecified joint

ICD-10-CM Codes›M00–M99›M20-M25›M24

ICD-10-CM M24.60
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M24.60 is a billable ICD-10-CM diagnosis code for ankylosis, unspecified joint. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 553 through 554. Coders also document this condition as ankylosis of joint. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified joint disorders.

Code Identity

ICD-10-CM Code
M24.60
Billable Status
Yes — Valid for Submission
Code Describes
Ankylosis, unspecified joint
Short Description
Ankylosis, unspecified joint
Same as the full description in the CMS dataset.
Parent Code
M24.6
Ankylosis of joint

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM20-M25Other joint disorders
CategoryM24Other specific joint derangements
This CodeM24.60Ankylosis, unspecified joint

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Ankylosis of joint
  • Ankylosis of joint of multiple sites
  • Ankylosis of lower limb joint
  • Ankylosis of upper limb joint
  • Arthrofibrosis
  • Atlantoaxial ankylosis
  • Cervical spine ankylosis

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.

    • Ankylosis(fibrous) (osseous) (joint)

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

Clinical InformationClinical

  • Arthrofibrosis

    fibrotic joint disorder characterized by excessive collagen production and adhesions that result in restricted joint motion and pain.

Patient EducationClinical

Joint Disorders

Your joints are places where two or more bones come together. Your shoulders, elbows, hips, knees, and knuckles are all joints. Your spine has joints, too.

The full article covers:

  • What are joints?
  • What are joint disorders?
  • What diseases can affect the joints?
  • What types of joint disorders happen from sudden injuries?
  • What types of joint disorders happen from overuse?
  • How can I keep my joints healthy?

Read the full article at MedlinePlus

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

Convert M24.60 to ICD-9-CMHistory

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

ICD-9-CM
718.50 Ankylosis-unspec
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 M24.60Overview

Is M24.60 (Ankylosis of joint) a billable code?

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

What MS-DRG does M24.60 group to?

When ankylosis, unspecified joint is the principal diagnosis on an inpatient stay, it groups to MS-DRG 553, 554, with relative weights from 0.8301 to 1.2963 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M24.60?

Under the General Equivalence Mappings, ankylosis, unspecified joint converts to ICD-9-CM 718.50 (ankylosis-unspec). 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.