2026 ICD-10-CM Diagnosis Code M08.0AUnspecified juvenile rheumatoid arthritis, other specified site

ICD-10-CM Codes›M00–M99›M05-M14›M08

ICD-10-CM M08.0A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M08.0A is a billable ICD-10-CM diagnosis code for unspecified juvenile rheumatoid arthritis, other specified site. 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 Juvenile arthritis.

Code Identity

ICD-10-CM Code
M08.0A
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified juvenile rheumatoid arthritis, other specified site
Short Description
Unspecified juvenile rheumatoid arthritis, oth site
Parent Code
M08.0
Unspecified juvenile rheumatoid arthritis

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM05-M14Inflammatory polyarthropathies
CategoryM08Juvenile arthritis
This CodeM08.0AUnspecified juvenile rheumatoid arthritis, other specified site

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
        • juvenile (with or without rheumatoid factor)
          • specified site NEC

Clinical ClassificationClinical

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

CCSR MUS004
Juvenile arthritis
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.

Code History & ChangesHistory

Replacement M08.0A replaces the following previously assigned code(s):

  • M08.00 - Unsp juvenile rheumatoid arthritis of unspecified site
FY 2021AddedAdded to the ICD-10-CM code setEffective October 1, 2020.
FY 2022–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M08.0AOverview

Is M08.0A (Unspecified juvenile rheumatoid arthritis) a billable code?

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

What MS-DRG does M08.0A group to?

When unspecified juvenile rheumatoid arthritis, other specified site 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.

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.