2026 ICD-10-CM Diagnosis Code M25.174Fistula, right foot

ICD-10-CM Codes›M00–M99›M20-M25›M25

ICD-10-CM M25.174
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M25.174 is a billable ICD-10-CM diagnosis code for fistula, right 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. Coders also document this condition as fistula of joint of bilateral feet. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified joint disorders.

Code Identity

ICD-10-CM Code
M25.174
Billable Status
Yes — Valid for Submission
Code Describes
Fistula, right foot
Short Description
Fistula, right foot
Same as the full description in the CMS dataset.
Parent Code
M25.17
Fistula, 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 CodeM25.174Fistula, right foot

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Fistula of joint of bilateral feet
  • Fistula of joint of foot
  • Fistula of joint of left foot
  • Fistula of joint of right foot

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

Fistulas

A fistula is an abnormal connection between two parts inside of the body. Fistulas may develop between different organs, such as between the esophagus and the windpipe or the bowel and the vagina. They can also develop between two blood vessels, such as between an artery and a vein or between two arteries.

Read the full article at MedlinePlus

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Convert M25.174 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 M25.174Overview

Is M25.174 (Fistula, ankle and foot) a billable code?

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

What MS-DRG does M25.174 group to?

When fistula, right 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 M25.174?

Under the General Equivalence Mappings, fistula, right 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.