2026 ICD-10-CM Diagnosis Code M06.9Rheumatoid arthritis, unspecified

ICD-10-CM Codes›M00–M99›M05-M14›M06

ICD-10-CM M06.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M06.9 is a billable ICD-10-CM diagnosis code for rheumatoid arthritis, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 545 through 547. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Rheumatoid arthritis and related disease.

This medical diagnosis code is frequently used in Orthopedics medical specialties to designate conditions such rheumatoid arthritis.

Code Identity

ICD-10-CM Code
M06.9
Billable Status
Yes — Valid for Submission
Code Describes
Rheumatoid arthritis, unspecified
Short Description
Rheumatoid arthritis, unspecified
Same as the full description in the CMS dataset.
Parent Code
M06
Other rheumatoid arthritis

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM05-M14Inflammatory polyarthropathies
CategoryM06Other rheumatoid arthritis
This CodeM06.9Rheumatoid arthritis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute rheumatic arthritis
  • Acute rheumatic fever
  • Anti-citrullinated protein antibody detected
  • Anti-citrullinated protein antibody positive erosive rheumatoid arthritis
  • Arthritis of acromioclavicular joint
  • Arthritis of left temporomandibular joint
  • Arthritis of right temporomandibular joint
  • Arthropathy associated with bacterial disease
  • Bilateral arthritis of glenohumeral joints
  • Bilateral rheumatoid arthritis of feet
  • Bilateral rheumatoid arthritis of hands
  • Bilateral rheumatoid arthritis of knees
  • Bilateral temporomandibular joint arthritis
  • Chronic rheumatic arthritis
  • Cutaneous complication of rheumatoid disease
  • Deformity of hand due to rheumatoid arthritis
  • Deformity of left wrist due to rheumatoid arthritis
  • Deformity of right wrist due to rheumatoid arthritis
  • Deformity of wrist due to rheumatoid arthritis
  • Dilated cardiomyopathy due to rheumatoid arthritis
  • Flare of rheumatoid arthritis
  • Inflammation of interphalangeal joint of toe
  • Inflammation of metacarpophalangeal joint
  • Post-bacterial arthropathy
  • Post-streptococcal reactive arthritis
  • Rheumatic arthritis
  • Rheumatic arthritis of temporomandibular joint
  • Rheumatoid arthritis
  • Rheumatoid arthritis - hand joint
  • Rheumatoid arthritis in remission
  • Rheumatoid arthritis of acromioclavicular joint
  • Rheumatoid arthritis of bilateral glenohumeral joints
  • Rheumatoid arthritis of bilateral temporomandibular joints
  • Rheumatoid arthritis of elbow
  • Rheumatoid arthritis of first metatarsophalangeal joint
  • Rheumatoid arthritis of foot
  • Rheumatoid arthritis of hip
  • Rheumatoid arthritis of interphalangeal joint of toe
  • Rheumatoid arthritis of knee
  • Rheumatoid arthritis of left foot
  • Rheumatoid arthritis of left hand
  • Rheumatoid arthritis of left knee
  • Rheumatoid arthritis of left shoulder
  • Rheumatoid arthritis of left temporomandibular joint
  • Rheumatoid arthritis of left wrist
  • Rheumatoid arthritis of lesser metatarsophalangeal joint
  • Rheumatoid arthritis of metacarpophalangeal joint
  • Rheumatoid arthritis of right foot
  • Rheumatoid arthritis of right hand
  • Rheumatoid arthritis of right knee
  • Rheumatoid arthritis of right shoulder
  • Rheumatoid arthritis of right temporomandibular joint
  • Rheumatoid arthritis of right wrist
  • Rheumatoid arthritis of sacroiliac joint
  • Rheumatoid arthritis of shoulder
  • Rheumatoid arthritis of sternoclavicular joint
  • Rheumatoid arthritis of subtalar joint
  • Rheumatoid arthritis of talonavicular joint
  • Rheumatoid arthritis of temporomandibular joint
  • Rheumatoid arthritis of tibiofibular joint
  • Rheumatoid arthritis of wrist
  • Rheumatoid arthritis with erosion of joint
  • Rheumatoid neutrophilic dermatitis
  • Spindling of finger
  • Spindling of fingers of bilateral hands due to rheumatoid 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.

    • Arthritis, arthritic(acute) (chronic) (nonpyogenic) (subacute)
      • rheumatoid

Clinical ClassificationClinical

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

CCSR MUS003
Rheumatoid arthritis and related disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Rheumatoid Arthritis

Rheumatoid arthritis (RA) is a form of arthritis that causes pain, swelling, and stiffness in your joints. RA is an autoimmune disease. Although it is most common in the wrist and fingers, this disease can cause your immune system to attack any joint tissue. The inflammation (swelling) that comes with RA can also affect other body parts.

The full article covers:

  • What is rheumatoid arthritis?
  • Who is more likely to get rheumatoid arthritis?
  • What causes rheumatoid arthritis?
  • What are the symptoms of rheumatoid arthritis?
  • How is rheumatoid arthritis diagnosed?
  • What are the treatments for rheumatoid arthritis?

Read the full article at MedlinePlus

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

Convert M06.9 to ICD-9-CMHistory

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

ICD-9-CM
714.0 Rheumatoid arthritis
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 M06.9Overview

Is M06.9 (Other rheumatoid arthritis) a billable code?

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

What MS-DRG does M06.9 group to?

When rheumatoid arthritis, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 545, 546, 547, with relative weights from 0.8362 to 2.4817 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M06.9?

Under the General Equivalence Mappings, rheumatoid arthritis, unspecified converts to ICD-9-CM 714.0 (rheumatoid arthritis). 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.