2026 ICD-10-CM Diagnosis Code M24.173Other articular cartilage disorders, unspecified ankle

ICD-10-CM Codes›M00–M99›M20-M25›M24

ICD-10-CM M24.173
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M24.173 is a billable ICD-10-CM diagnosis code for other articular cartilage disorders, unspecified ankle. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 562 through 563. Coders also document this condition as articular cartilage disorder of ankle AND/OR foot. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified joint disorders.

Code Identity

ICD-10-CM Code
M24.173
Billable Status
Yes — Valid for Submission
Code Describes
Other articular cartilage disorders, unspecified ankle
Short Description
Other articular cartilage disorders, unspecified ankle
Same as the full description in the CMS dataset.
Parent Code
M24.17
Other articular cartilage disorders, ankle and foot

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM20-M25Other joint disorders
CategoryM24Other specific joint derangements
This CodeM24.173Other articular cartilage disorders, unspecified ankle

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Articular cartilage disorder of ankle AND/OR foot
  • Articular cartilage disorder of the ankle and foot
  • Disorder of articular cartilage of ankle

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

Ankle Injuries and Disorders

Your ankle bone and the ends of your two lower leg bones make up the ankle joint. Your ligaments, which connect bones to one another, stabilize and support it. Your muscles and tendons move it.

Read the full article at MedlinePlus

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

Convert M24.173 to ICD-9-CMHistory

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

ICD-9-CM
718.07 Artic cartil dis-ankle
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 M24.173Overview

Is M24.173 (Other articular cartilage disorders, ankle and foot) a billable code?

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

What MS-DRG does M24.173 group to?

When other articular cartilage disorders, unspecified ankle is the principal diagnosis on an inpatient stay, it groups to MS-DRG 562, 563, with relative weights from 0.8955 to 1.4248 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M24.173?

Under the General Equivalence Mappings, other articular cartilage disorders, unspecified ankle converts to ICD-9-CM 718.07 (artic cartil dis-ankle). 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.