2026 ICD-10-CM Diagnosis Code M02.9Reactive arthropathy, unspecified

ICD-10-CM Codes›M00–M99›M00-M02›M02

ICD-10-CM M02.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M02.9 is a billable ICD-10-CM diagnosis code for reactive arthropathy, unspecified. 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. The code is a manifestation code that cannot be reported as the principal diagnosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Immune-mediated/reactive arthropathies.

Code Identity

ICD-10-CM Code
M02.9
Billable Status
Yes — Valid for Submission
Code Describes
Reactive arthropathy, unspecified
Short Description
Reactive arthropathy, unspecified
Same as the full description in the CMS dataset.
Parent Code
M02
Postinfective and reactive arthropathies

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM00-M02Infectious arthropathies
CategoryM02Postinfective and reactive arthropathies
This CodeM02.9Reactive arthropathy, unspecified

Code EditsBilling

Medicare Code Editor checks that affect claim validity for M02.9.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Arthritis due to and following viral infection
  • Arthritis due to parasitic infection
  • Arthropathy associated with bacterial disease
  • Arthropathy associated with viral disease
  • Inflammation of pubic symphysis
  • Juvenile reactive arthritis
  • Mycobacterial postinfective arthritis
  • Parasitic postinfectious arthritis
  • Post-bacterial arthropathy
  • Post-genitourinary infection reactive arthritis
  • Postinfectious arthritis due to Yersinia enterocolitica enteritis
  • Post-infective arthritis
  • Post-streptococcal reactive arthritis
  • Reactive arthritis
  • Reactive arthritis due to and following infective urethritis
  • Reactive arthritis of symphysis pubis
  • Urethritis co-occurrent with reactive arthritis

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.

    • Arthropathy
      • reactive

Clinical ClassificationClinical

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

CCSR MUS008
Immune-mediated/reactive arthropathies
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Post-Streptococcal Arthritis|PSRA|PSRA|Post-Streptococcal Reactive Arthritis|Post-Streptococcal Reactive Arthritis

    the occurrence of arthritis after infection with group a streptococcus. it is non-migratory, protracted in course, and poorly responsive to anti-inflammatory agents. (from textbook of pediatric rheumatology, 6th ed. cassidy, petty, laxer, and lindsley)

  • Reactive Arthritis

    a form of inflammatory arthritis that results as a reaction to a bacterial infection outside the joint.

Patient EducationClinical

Infectious Arthritis

Most kinds of arthritis cause pain and swelling in your joints. Joints are places where two bones meet, such as your elbow or knee. Infectious arthritis is an infection in the joint. The infection comes from a bacterial, viral, or fungal infection that spreads from another part of the body. Symptoms of infectious arthritis include:

Read the full article at MedlinePlus

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

Convert M02.9 to ICD-9-CMHistory

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

ICD-9-CM
713.7 Arthrop w system 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 M02.9Overview

Is M02.9 (Postinfective and reactive arthropathies) a billable code?

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

What MS-DRG does M02.9 group to?

On inpatient claims, reactive arthropathy, unspecified maps to MS-DRG 553, 554, with relative weights from 0.8301 to 1.2963 depending on complications. Higher weights mean higher Medicare reimbursement.

Can M02.9 be a principal diagnosis?

No. This is a manifestation code: reactive arthropathy, unspecified describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

What is the ICD-9 equivalent of M02.9?

Under the General Equivalence Mappings, reactive arthropathy, unspecified converts to ICD-9-CM 713.7 (arthrop w system dis NEC). 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.