Table 3 ICD-9-CM codes of rheumatoid arthritis and its variants when rheumatoid arthritis was coded as the main diagnosisa
Type of rheumatoid arthritis | Code | Principal diagnostic | |
|---|---|---|---|
N | % | ||
Rheumatoid arthritis | 714.0 | 29,059 | 9.22% |
Felty syndrome | 714.1 | 37 | 0.01% |
RA with visceral or systemic implication | 714.2 | 40 | 0.01% |
RA youth polyarticular chronicle | 714.30 | 78 | 0.02% |
Acute youth polyarticular RA | 714.31 | 19 | 0.01% |
Oligoarticular or pauciarticular juvenile RA | 714.32 | 11 | 0.003% |
Monoarticular youth RA | 714.33 | 12 | 0.004% |
Postrheumatic arthropathy chronicle | 714.4 | 19 | 0.01% |
Rheumatic lung | 714.81 | 412 | 0.13% |
Other inflammatory polyartopathies | 714.89 | 39 | 0.01% |
Inflammatory non-specific polyartropathy | 714.9 | 83 | 0.03% |
Total RA | 29,809 | 9.46% | |
Other pathologies | 285,381 | 90.54% | |
Total | 315,190 | 100% | |