2026 ICD-10-CM Diagnosis Code M10.079Idiopathic gout, unspecified ankle and foot

ICD-10-CM Codes›M00–M99›M05-M14›M10

ICD-10-CM M10.079
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M10.079 is a billable ICD-10-CM diagnosis code for idiopathic gout, 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 gouty arthritis of ankle and/or foot. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gout.

Code Identity

ICD-10-CM Code
M10.079
Billable Status
Yes — Valid for Submission
Code Describes
Idiopathic gout, unspecified ankle and foot
Short Description
Idiopathic gout, unspecified ankle and foot
Same as the full description in the CMS dataset.
Parent Code
M10.07
Idiopathic gout, ankle and foot

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM05-M14Inflammatory polyarthropathies
CategoryM10Gout
This CodeM10.079Idiopathic gout, unspecified ankle and foot

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Gouty arthritis of ankle and/or foot
  • Gouty arthritis of toe

Clinical ClassificationClinical

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

CCSR MUS033
Gout
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Gout

Gout is a common type of inflammatory arthritis. It causes pain, swelling, and redness in one or more joints. It usually happens as a flare, which can last for a week or two and then gets better. The flares often begin in your big toe or a lower limb.

The full article covers:

  • What is gout?
  • What causes gout?
  • Who is more likely to develop gout?
  • What are the symptoms of gout?
  • How is gout diagnosed?
  • What are the treatments for gout?

Read the full article at MedlinePlus

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

Convert M10.079 to ICD-9-CMHistory

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

ICD-9-CM
274.00 Gouty arthropathy NOS
Approximate The match is approximate rather than exact.
ICD-9-CM
274.01 Acute gouty arthropathy
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 M10.079Overview

Is M10.079 (Idiopathic gout, ankle and foot) a billable code?

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

What MS-DRG does M10.079 group to?

When idiopathic gout, 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 M10.079?

Under the General Equivalence Mappings, idiopathic gout, unspecified ankle and foot converts to ICD-9-CM 274.00 (gouty arthropathy NOS) and 274.01 (acute gouty arthropathy). 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.