2026 ICD-10-CM Diagnosis Code M93.279Osteochondritis dissecans, unspecified ankle and joints of foot

ICD-10-CM Codes›M00–M99›M91-M94›M93

ICD-10-CM M93.279
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M93.279 is a billable ICD-10-CM diagnosis code for osteochondritis dissecans, unspecified ankle and joints of 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 avascular necrosis of metatarsal bone. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified bone disease and musculoskeletal deformities.

Code Identity

ICD-10-CM Code
M93.279
Billable Status
Yes — Valid for Submission
Code Describes
Osteochondritis dissecans, unspecified ankle and joints of foot
Short Description
Osteochondritis dissecans, unsp ankle and joints of foot
Parent Code
M93.27
Osteochondritis dissecans of ankle and joints of foot

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM91-M94Chondropathies
CategoryM93Other osteochondropathies
This CodeM93.279Osteochondritis dissecans, unspecified ankle and joints of foot

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Avascular necrosis of metatarsal bone
  • Avascular necrosis of tarsus
  • Osteochondritis dissecans of bone of ankle
  • Osteochondritis dissecans of bone of foot
  • Osteochondritis dissecans of metatarsal bone
  • Osteochondritis dissecans of tarsal bone
  • Osteochondritis dissecans of the talus
  • Osteonecrosis of talus

Clinical ClassificationClinical

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

CCSR MUS028
Other specified bone disease and musculoskeletal deformities
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Bone Diseases

Your bones help you move, give you shape and support your body. They are living tissues that rebuild constantly throughout your life. During childhood and your teens, your body adds new bone faster than it removes old bone. After about age 20, you can lose bone faster than you make bone.

Read the full article at MedlinePlus

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

Convert M93.279 to ICD-9-CMHistory

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

ICD-9-CM
732.7 Osteochondrit dissecans
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 M93.279Overview

Is M93.279 (Osteochondritis dissecans of ankle and joints of foot) a billable code?

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

What MS-DRG does M93.279 group to?

When osteochondritis dissecans, unspecified ankle and joints of 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 M93.279?

Under the General Equivalence Mappings, osteochondritis dissecans, unspecified ankle and joints of foot converts to ICD-9-CM 732.7 (osteochondrit dissecans). 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.