2026 ICD-10-CM Diagnosis Code M25.879Other specified joint disorders, unspecified ankle and foot

ICD-10-CM Codes›M00–M99›M20-M25›M25

ICD-10-CM M25.879
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M25.879 is a billable ICD-10-CM diagnosis code for other specified joint disorders, 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 555 through 556. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified joint disorders.

Code Identity

ICD-10-CM Code
M25.879
Billable Status
Yes — Valid for Submission
Code Describes
Other specified joint disorders, unspecified ankle and foot
Short Description
Other specified joint disorders, unspecified ankle and foot
Same as the full description in the CMS dataset.
Parent Code
M25.87
Other specified joint disorders, ankle and foot

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM20-M25Other joint disorders
CategoryM25Other joint disorder, not elsewhere classified
This CodeM25.879Other specified joint disorders, unspecified ankle and foot

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Active range of toe abduction - finding
  • Active range of toe adduction - finding
  • Active range of toe extension - finding
  • Active range of toe flexion - finding
  • Ankle joint - blue
  • Ankle joint - cold
  • Ankle joint - cool
  • Ankle joint - hot
  • Ankle joint - red
  • Ankle joint - warm
  • Ankle joint color - finding
  • Ankle joint temperature finding
  • Anterior ankle impingement
  • Bony swelling of ankle joint
  • Capsulitis of ankle
  • Decreased active range of toe abduction
  • Decreased active range of toe adduction
  • Decreased active range of toe extension
  • Decreased active range of toe flexion
  • Decreased passive range of toe abduction
  • Decreased passive range of toe adduction
  • Decreased passive range of toe extension
  • Decreased passive range of toe flexion
  • Decreased range of toe movement
  • Fibular ankle impingement
  • Foot joint - blue
  • Foot joint - cold
  • Foot joint - cool
  • Foot joint - hot
  • Foot joint - red
  • Foot joint - warm
  • Foot joint color - finding
  • Foot joint temperature finding
  • Impingement syndrome of ankle
  • Joint cold
  • Joint cool
  • Joint hot
  • Joint warm
  • Lesion of joint capsule of ankle region
  • Lesion of joint capsule of foot region
  • Mass of joint of ankle
  • Mass of joint of foot
  • No active range of toe abduction
  • No active range of toe adduction
  • No active range of toe extension
  • No active range of toe flexion
  • No passive range of toe abduction
  • No passive range of toe adduction
  • No passive range of toe extension
  • No passive range of toe flexion
  • No toe movement
  • Os trigonum impingement
  • Passive range of toe abduction - finding
  • Passive range of toe adduction - finding
  • Passive range of toe extension - finding
  • Passive range of toe flexion - finding
  • Posterior ankle impingement
  • Problem of ankle
  • Problem of lower limb
  • Range of toe abduction - finding
  • Range of toe adduction - finding
  • Swelling of ankle joint
  • Swollen ankle region
  • Toe joint - cold
  • Toe joint - cool
  • Toe joint - hot
  • Toe joint - warm
  • Toe joint color - finding
  • Toe joint red
  • Toe joint rigid
  • Toe joint temperature finding

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 M25.879 to ICD-9-CMHistory

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

ICD-9-CM
719.87 Joint dis NEC-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 M25.879Overview

Is M25.879 (Other specified joint disorders, ankle and foot) a billable code?

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

What MS-DRG does M25.879 group to?

When other specified joint disorders, unspecified ankle and foot is the principal diagnosis on an inpatient stay, it groups to MS-DRG 555, 556, with relative weights from 0.8306 to 1.3218 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M25.879?

Under the General Equivalence Mappings, other specified joint disorders, unspecified ankle and foot converts to ICD-9-CM 719.87 (joint dis NEC-ankle). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.