Health Care Service and Outcomes Among an Estimated 6.7 Million Ambulatory Care Diabetic Foot Cases in the U.S.

Abstract

OBJECTIVE To evaluate ambulatory clinical cases of diabetic foot ulcers (DFUs) and diabetic foot infections (DFIs) in the U.S. from 2007 to 2013 and to assess outcomes of emergency department or inpatient (ED/IP) admission, number of clinic visits per year, and physician time spent per visit. RESEARCH DESIGN AND METHODS A cross-sectional historical cohort analysis was conducted by using the nationally representative Centers for Disease Control and Prevention National Ambulatory Medical Care Survey data from 2007 to 2013, including patients age ≥18 years with diabetes and either DFIs or DFUs. Study outcomes were analyzed by using generalized linear models controlling for key demographics and chronic conditions. RESULTS Across the estimated 5.6 billion ambulatory care visits between 2007 and 2013, 784.8 million involved diabetes and ∼6.7 million (0.8%) were for DFUs (0.3%) or DFIs (0.5%). Relative to other ambulatory clinical cases, multivariable analyses indicated that DFUs were associated with a 3.4 times higher odds of direct ED/IP admission (CI 1.01–11.28; P = 0.049), 2.1 times higher odds of referral to another physician (CI 1.14–3.71; P = 0.017), 1.9 times more visits in the past 12 months (CI 1.41–2.42; P < 0.001), and 1.4 times longer time spent per visit with the physician (CI 1.03–1.87; P = 0.033). DFIs were independently associated with a 6.7 times higher odds of direct ED referral or IP admission (CI 2.25–19.51; P < 0.001) and 1.5 times more visits in the past 12 months (CI 1.14–1.90; P = 0.003). CONCLUSIONS This investigation of an estimated 6.7 million diabetic foot cases indicates markedly greater risks for both ED/IP admissions and number of outpatient visits, with DFUs also associated with a higher odds of referrals to other physicians and longer physician visit times.