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Table 1 Case definitions for primary outcomes

From: The epidemiology of infectious gastroenteritis related reactive arthritis in U.S. military personnel: a case-control study

Category ICD-9 code(s) Case Definition
Reiter's Disease 099.3, 711.1 Minimum of two medical encounters with Reiter's disease coded within 12 months
   -OR-
   One medical encounter with Reiter's disease coded, preceded by at least one encounter with a nonspecific arthropathy coded within 12 months
Postdysenteric arthritis 711.3 Minimum of two medical encounters with postdysenteric arthritis coded within 12 months
   -OR-
   One medical encounter with postdysenteric arthritis coded, preceded by at least one encounter with a nonspecific arthropathy coded within 12 months
Specific ReA diagnosis 099.3, 711.1, 711.3 Meets criteria for Reiter's Disease OR postdysenteric arthritis
Nonspecific arthropathy/arthalgiaa 716.4, 716.5,
716.6, 716.9,
719.4
Minimum of two medical encounters with a nonspecific arthropathy coded within 12 months. Subjects meeting the Reiter's disease or postdysenteric arthritis definitions were excluded.
  1. a The listed nonspecific arthopathy/arthalgia ICD-9 codes correspond to the following: transient arthropathy (all subgroups), unspecified polyarthropathy or polyarthritis (all subgroups), unspecified monoarthritis (all subgroups), other specified arthropathy (all subgroups), and unspecified arthropathy (all subgroups)