2026 ICD-10-CM Diagnosis Code M94.1Relapsing polychondritis

ICD-10-CM Codes›M00–M99›M91-M94›M94

ICD-10-CM M94.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M94.1 is a billable ICD-10-CM diagnosis code for relapsing polychondritis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 564 through 566. Coders also document this condition as MAGIC syndrome. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified bone disease and musculoskeletal deformities.

Code Identity

ICD-10-CM Code
M94.1
Billable Status
Yes — Valid for Submission
Code Describes
Relapsing polychondritis
Short Description
Relapsing polychondritis
Same as the full description in the CMS dataset.
Parent Code
M94
Other disorders of cartilage

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM91-M94Chondropathies
CategoryM94Other disorders of cartilage
This CodeM94.1Relapsing polychondritis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • MAGIC syndrome
  • Recurrent ulcer of mouth
  • Relapsing polychondritis
  • Relapsing polychondritis of larynx

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Polychondritis(atrophic) (chronic)
      • relapsing

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

Clinical InformationClinical

  • Relapsing Polychondritis

    a rare autoimmune disorder characterized by recurrent episodes of inflammation of cartilage and other connective tissues.

Patient EducationClinical

Cartilage Disorders

Cartilage is the tough but flexible tissue that covers the ends of your bones at a joint. It also gives shape and support to other parts of your body, such as your ears, nose and windpipe. Healthy cartilage helps you move by allowing your bones to glide over each other.

Read the full article at MedlinePlus

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

Convert M94.1 to ICD-9-CMHistory

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

ICD-9-CM
733.99 Bone & cartilage dis NEC
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 M94.1Overview

Is M94.1 (Other disorders of cartilage) a billable code?

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

What MS-DRG does M94.1 group to?

When relapsing polychondritis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 565, 566, with relative weights from 0.7493 to 1.5436 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M94.1?

Under the General Equivalence Mappings, relapsing polychondritis converts to ICD-9-CM 733.99 (bone & cartilage dis NEC). 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.