2026 ICD-10-CM Diagnosis Code M12.579Traumatic arthropathy, unspecified ankle and foot

ICD-10-CM Codes›M00–M99›M05-M14›M12

ICD-10-CM M12.579
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M12.579 is a billable ICD-10-CM diagnosis code for traumatic arthropathy, unspecified ankle and foot. 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 traumatic arthropathy of 1st metatarsophalangeal joint. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Traumatic arthropathy.

Code Identity

ICD-10-CM Code
M12.579
Billable Status
Yes — Valid for Submission
Code Describes
Traumatic arthropathy, unspecified ankle and foot
Short Description
Traumatic arthropathy, unspecified ankle and foot
Same as the full description in the CMS dataset.
Parent Code
M12.57
Traumatic arthropathy, ankle and foot

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM05-M14Inflammatory polyarthropathies
CategoryM12Other and unspecified arthropathy
This CodeM12.579Traumatic arthropathy, unspecified ankle and foot

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Traumatic arthropathy of 1st metatarsophalangeal joint
  • Traumatic arthropathy of interphalangeal joint of toe
  • Traumatic arthropathy of lesser metatarsophalangeal joint
  • Traumatic arthropathy of subtalar joint
  • Traumatic arthropathy of talonavicular joint
  • Traumatic arthropathy of the ankle and/or foot
  • Traumatic arthropathy-ankle

Clinical ClassificationClinical

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

CCSR MUS031
Traumatic arthropathy
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 M12.579 to ICD-9-CMHistory

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

ICD-9-CM
716.17 Traum arthropathy-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 M12.579Overview

Is M12.579 (Traumatic arthropathy, ankle and foot) a billable code?

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

What MS-DRG does M12.579 group to?

When traumatic arthropathy, unspecified ankle and foot 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 M12.579?

Under the General Equivalence Mappings, traumatic arthropathy, unspecified ankle and foot converts to ICD-9-CM 716.17 (traum arthropathy-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.