2026 ICD-10-CM Diagnosis Code M08.00Unspecified juvenile rheumatoid arthritis of unspecified site

ICD-10-CM Codes›M00–M99›M05-M14›M08

ICD-10-CM M08.00
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M08.00 is a billable ICD-10-CM diagnosis code for unspecified juvenile rheumatoid arthritis of unspecified 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
M08.00
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified juvenile rheumatoid arthritis of unspecified site
Short Description
Unsp juvenile rheumatoid arthritis of unspecified 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 CodeM08.00Unspecified juvenile rheumatoid arthritis of unspecified site

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 left temporomandibular joint
  • Arthritis of right temporomandibular joint
  • Arthropathy associated with bacterial disease
  • Bilateral temporomandibular joint arthritis
  • Chronic rheumatic arthritis
  • Deformity of hand due to rheumatoid arthritis
  • Dilated cardiomyopathy due to rheumatoid arthritis
  • Flare of rheumatoid arthritis
  • Inflammation of metacarpophalangeal joint
  • Post-bacterial arthropathy
  • Post-streptococcal reactive arthritis
  • Rheumatic arthritis
  • Rheumatic arthritis of temporomandibular joint
  • Rheumatoid arthritis
  • Rheumatoid arthritis in remission
  • Rheumatoid arthritis of bilateral temporomandibular joints
  • Rheumatoid arthritis of elbow
  • Rheumatoid arthritis of left temporomandibular joint
  • Rheumatoid arthritis of metacarpophalangeal joint
  • Rheumatoid arthritis of right temporomandibular joint
  • Rheumatoid arthritis of sacroiliac joint
  • Rheumatoid arthritis of sternoclavicular joint
  • Rheumatoid arthritis of temporomandibular joint
  • Rheumatoid arthritis of tibiofibular joint
  • Rheumatoid arthritis with erosion of joint
  • 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
        • juvenile (with or without rheumatoid factor)

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

Juvenile Arthritis

Juvenile arthritis (JA) is arthritis that happens in children. It causes joint inflammation (swelling), pain, stiffness, and loss of motion. Joints are places where two bones meet, such as your elbow or knee. It can affect any joint, but it is more common in the knees, hands, and feet.

The full article covers:

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

Read the full article at MedlinePlus

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

Convert M08.00 to ICD-9-CMHistory

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

ICD-9-CM
714.30 Juv rheum arthritis NOS
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 M08.00Overview

Is M08.00 (Unspecified juvenile rheumatoid arthritis) a billable code?

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

What MS-DRG does M08.00 group to?

When unspecified juvenile rheumatoid arthritis of unspecified 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.

What is the ICD-9 equivalent of M08.00?

Under the General Equivalence Mappings, unspecified juvenile rheumatoid arthritis of unspecified site converts to ICD-9-CM 714.30 (juv rheum arthritis NOS). 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.