ICD-11 classes
15 Diseases of the musculoskeletal system or connective...
Nonorgan specific systemic autoimmune disorders
FA20 — Rheumatoid arthritis
ICD-11 FA20 — Rheumatoid arthritis
Rheumatoid arthritis (RA) is persistent and/or erosive disease that is defined as the confirmed presence of synovitis in at least 1 joint, absence of an alternative diagnosis that better explains the synovitis, and achievement of a total score of 6 or greater (of a possible 10) from the individual scores in 4 domains: number and site of involved joints, serologic abnormality, elevated acute-phase response, and symptom duration.
The diagnosis includes nothing.
It excludes 2 items.
- rheumatoid arthritis, juvenile (FA24.1)
- Acute rheumatic fever (1B40-1B42)
Diagnosis with code FA20 contains 3 clarifying diagnoses:
- FA20.0 — Seropositive rheumatoid arthritis
- FA20.1 — Seronegative rheumatoid arthritis
- FA20.Z — Rheumatoid arthritis, serology unspecified
The diagnosis is coded elsewhere:
- Nonorgan specific systemic autoimmune disorders #3617
- Rheumatoid arthritis #3708
- Inflammatory arthropathies #17662
- Rheumatoid arthritis #17663
The diagnosis is included in 1 another class.
- Respiratory disorders in rheumatoid arthritis (CB05.1)