M08.261 Juvenile rheumatoid arthritis with systemic onset, right knee

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.-)

Applies from M08.2 Juvenile rheumatoid arthritis with systemic onset

Applicable to

• Still's disease NOS

Excludes1 (never code together)

• adult-onset Still's disease (M06.1-)

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)

• 714.30 Polyarticular juvenile rheumatoid arthritis, chronic or unspecified (approximate)

Code annotations containing back-references to M08.261

Back-references to M08.2

• Type 1 Excludes: M06.1 Adult-onset Still's disease ("Still's disease NOS (M08.2-)")

Back-references to M08

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

Nearby codes

• M08.25 Juvenile rheumatoid arthritis with systemic onset, hip
• M08.251 Juvenile rheumatoid arthritis with systemic onset, right hip
• M08.252 Juvenile rheumatoid arthritis with systemic onset, left hip
• M08.259 Juvenile rheumatoid arthritis with systemic onset, unspecified hip
• M08.26 Juvenile rheumatoid arthritis with systemic onset, knee
• M08.261 Juvenile rheumatoid arthritis with systemic onset, right knee (this code)
• M08.262 Juvenile rheumatoid arthritis with systemic onset, left knee
• M08.269 Juvenile rheumatoid arthritis with systemic onset, unspecified knee
• M08.27 Juvenile rheumatoid arthritis with systemic onset, ankle and foot
• M08.271 Juvenile rheumatoid arthritis with systemic onset, right ankle and foot
• M08.272 Juvenile rheumatoid arthritis with systemic onset, left ankle and foot