M08.421 Pauciarticular juvenile rheumatoid arthritis, right elbow

Billable ICD-10-CM code, FY2026.

Applies from M08 Juvenile arthritis

Excludes1 (never code together)

• arthropathy in Whipple's disease (M14.8)
• Felty's syndrome (M05.0)
• juvenile dermatomyositis (M33.0-)
• psoriatic juvenile arthropathy (L40.54)

Code also

• any associated underlying condition, such as:
• regional enteritis [Crohn's disease] (K50.-)
• ulcerative colitis (K51.-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 93 — Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders
• CMS-HCC V22: HCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease
• RxHCC V08: HCC 83 — Rheumatoid Arthritis and Other Inflammatory Polyarthropathy
• ESRD V24: HCC 40

MS-DRG index

Defines the logic of DRG(s) 545-547 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 714.32 Pauciarticular juvenile rheumatoid arthritis (approximate)

Code annotations containing back-references to M08.421

Back-references to M08

• Type 1 Excludes: M05 Rheumatoid arthritis with rheumatoid factor ("juvenile rheumatoid arthritis (M08.-)")

Nearby codes

• M08.41 Pauciarticular juvenile rheumatoid arthritis, shoulder
• M08.411 Pauciarticular juvenile rheumatoid arthritis, right shoulder
• M08.412 Pauciarticular juvenile rheumatoid arthritis, left shoulder
• M08.419 Pauciarticular juvenile rheumatoid arthritis, unspecified shoulder
• M08.42 Pauciarticular juvenile rheumatoid arthritis, elbow
• M08.421 Pauciarticular juvenile rheumatoid arthritis, right elbow (this code)
• M08.422 Pauciarticular juvenile rheumatoid arthritis, left elbow
• M08.429 Pauciarticular juvenile rheumatoid arthritis, unspecified elbow
• M08.43 Pauciarticular juvenile rheumatoid arthritis, wrist
• M08.431 Pauciarticular juvenile rheumatoid arthritis, right wrist
• M08.432 Pauciarticular juvenile rheumatoid arthritis, left wrist