Table 3—

Diabetes prevalence in VA patients 1998–2000*—with variation in diabetes definition

1998 (2,924,148)
1999 (3,094,710)
2000 (3,332,566)
No.PrevalenceNo.PrevalenceNo.Prevalence
Working definition:
 VA and/or Medicare, diabetes medication in current year, and/or 2+ ICD-9-CM codes for diabetes over current and past year (24 months) from inpatient stays and/or outpatient visits on separate days excluding codes from lab tests and other nonclinician visits489,59616.7%576,98518.6%654,67719.6%
Same as working definition except missing data sources:
 No medication data, 2+ codes485,55116.6%556,24018.0%637,41719.1%
 No inpatient data, medication and/or 2+ codes from outpatient visits only474,88616.2%552,32317.8%643,44219.3%
 No outpatient visit data, medication and/or 2+ codes from inpatient stays only373,24712.8%464,60915.0%476,08414.3%
Same as working definition except no Medicare data:
 VA data only medication and/or 2+ codes438,11015.0%510,92616.5%588,10517.6%
 VA data only, no medication data, 2+ codes410,84514.1%474,54615.3%559,50416.8%
 VA data only, no diagnostic code data, diabetes medication337,07411.5%439,28314.2%434,50713.0%
Same as working definition, with all data, varying code definitions:
 Medication and/or 2+ codes from inpatient or outpatient visits requiring at least 7 days between days with codes482,55316.5%561,04418.1%638,78819.2%
 Medication and/or 2+ codes from inpatient or primary care outpatient visits only471,16016.1%549,80717.8%634,02219.0%
 Medication and/or 2+ codes from inpatient or outpatient visits including those from lab tests2491,19716.8%578,46418.7%656,62219.7%
 Medication and/or 1 code from inpatient stays and/or 2+ codes from outpatient visits494,18116.9%581,80518.8%663,18119.9%
 Medication and/or any (1+) codes from inpatient or outpatient visits573,06319.6%676,85421.9%775,80023.3%
Same as working definition, adding cases based on HbA1c testing:
 Medication and/or 2+ codes and/or 2+ HbA1c tests in current year489,91016.8%577,92218.7%658,64219.8%
 Medication and/or 2+ codes and/or HbA1c value of seven or higher in current year490,23516.8%583,63318.9%662,13019.9%
  • *

    * Fiscal years from October 1997 to September 2000;

  • proportion of all patients in year with specified definition of diabetes; ‡and other nonclinician visits.