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Table 3 Agreement between recent rheumatoid factor lab test and M05 diagnosis code according to interval of time since testing occurred

From: Use of ICD-10 diagnosis codes to identify seropositive and seronegative rheumatoid arthritis when lab results are not available

  RISE MarketScan
Days between RF lab test and M05 diagnosis code for RA N Kappa N Kappa
0 (i.e., same day) 1375 0.40 (0.35, 0.45) 81 0.31 (0.11, 0.51)
1–7 691 0.49 (0.42, 0.55) 72 0.44 (0.25, 0.64)
8–30 3850 0.51 (0.48, 0.54) 246 0.46 (0.35, 0.57)
31–180 13,781 0.59 (0.27, 0.60) 847 0.43 (0.37, 0.49)
181–365 6152 0.64 (0.62, 0.66) 267 0.51 (0.41, 0.62)
  1. RF rheumatoid factor