Prevalence of ICD-9-CM codes for chronic kidney disease in individuals with cardiovascular disease risk factors.

BACKGROUND: Chronic kidney disease (CKD) is a risk factor for cardiovascular disease (CVD).
METHODS: We determined the prevalence of diagnosed CKD in 87,128 members older than 40 years of age without CVD who were enrolled in a regional medical care plan with at least 1 claim for medical care.
RESULTS: The prevalence of diagnosed CKD was 4%, and 8%, 6%, 5% and 10% in patients with diabetes, hypertension, hyperlipidemia and all 3 risk factors, respectively. In multivariate analysis, the odd ratios for CKD were 1.8 (95% confidence interval [95% CI], 1.7-2.0) for older age, 2.5 (95% CI, 2.3-2.8) for diabetes, 2.2 (95% CI, 2.2-2.4) for hypertension, 1.5 (95% CI, 1.4-1.7) for hyperlipidemia and 4.4 (95% CI, 2.8, 5.1) for all 3 risk factors.
CONCLUSION: Prevalence of diagnosed CKD among patients with CVD risk factors is low but increases with age and number of risk factors, suggesting inadequate awareness of CKD. This may have implications for control of CVD risk factors in patients with CKD.