ICD-10-CM 2027
ICD-10 code for Still's disease or syndrome
From the official ICD-10-CM alphabetic index entry “Still's disease or syndrome (juvenile)”. Page updated September 29, 2026.
About coding Still's disease or syndrome
The ICD-10-CM code for Still's disease or syndrome is M08.20 (Juvenile rheumatoid arthritis with systemic onset, unspecified site). The official index lists 12 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M08.20.
Within M08.2, choose M08.20 (unspecified site) only when documentation doesn't support a more specific option: shoulder (M08.21), elbow (M08.22), wrist (M08.23), hand (M08.24), hip (M08.25), knee (M08.26), ankle and foot (M08.27), vertebrae (M08.28) and 2 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 545 (Connective Tissue Disorders with MCC, relative weight 2.3892), DRG 546 (Connective Tissue Disorders with CC, relative weight 1.1745) and DRG 547 (Connective Tissue Disorders without CC/MCC, relative weight 0.7526), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Still's disease or syndrome codes (official index)
- adult-onset M06.1 — Adult-onset Still's disease
- ankle M08.27 — Juvenile rheumatoid arthritis with systemic onset, ankle and foot
- elbow M08.22 — Juvenile rheumatoid arthritis with systemic onset, elbow
- foot joint M08.27 — Juvenile rheumatoid arthritis with systemic onset, ankle and foot
- hand joint M08.24 — Juvenile rheumatoid arthritis with systemic onset, hand
- hip M08.25 — Juvenile rheumatoid arthritis with systemic onset, hip
- knee M08.26 — Juvenile rheumatoid arthritis with systemic onset, knee
- multiple site M08.29 — Juvenile rheumatoid arthritis with systemic onset, multiple sites
- shoulder M08.21 — Juvenile rheumatoid arthritis with systemic onset, shoulder
- specified site NEC M08.2A — Juvenile rheumatoid arthritis with systemic onset, other specified site
- vertebra M08.28 — Juvenile rheumatoid arthritis with systemic onset, vertebrae
- wrist M08.23 — Juvenile rheumatoid arthritis with systemic onset, wrist
Common questions about Still's disease or syndrome ICD-10 codes
What is the ICD-10 code for Still's disease or syndrome?
- M08.20 — Juvenile rheumatoid arthritis with systemic onset, unspecified site. More specific codes apply when the documentation supports them: M06.1, M08.27, M08.22, M08.27 and others below.
What is the ICD-10 code for adult-onset still's disease or syndrome?
- M06.1 — Adult-onset Still's disease.
What is the ICD-10 code for ankle still's disease or syndrome?
- M08.27 — Juvenile rheumatoid arthritis with systemic onset, ankle and foot (header code; choose a more specific subcode).
What is the ICD-10 code for elbow still's disease or syndrome?
- M08.22 — Juvenile rheumatoid arthritis with systemic onset, elbow (header code; choose a more specific subcode).
What is the ICD-10 code for foot joint still's disease or syndrome?
- M08.27 — Juvenile rheumatoid arthritis with systemic onset, ankle and foot (header code; choose a more specific subcode).
What is the ICD-10 code for hand joint still's disease or syndrome?
- M08.24 — Juvenile rheumatoid arthritis with systemic onset, hand (header code; choose a more specific subcode).
What is the ICD-10 code for hip still's disease or syndrome?
- M08.25 — Juvenile rheumatoid arthritis with systemic onset, hip (header code; choose a more specific subcode).
Is M08.20 billable?
- Yes. M08.20 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M08.20 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M08.20 as a principal diagnosis.
Is M08.20 a CC or MCC?
- No. M08.20 is neither a CC nor an MCC under MS-DRG v44.0.