Comparative Effectiveness and Costs of Insulin Pump Therapy for Diabetes
Ronald T. Ackermann, MD, MPH; Amisha Wallia, MD, MS; Raymond Kang, MA; Andrew Cooper, MPH; Theodore A. Prospect, FSA, MAAA; Lewis G. Sandy, MD, MBA; and Deneen Vojta, MD
Evaluation of healthcare utilization and costs over 3 years for adults with insulin-requiring diabetes who transition from multiple daily insulin injections to insulin infusion pumps.
Objectives: Continuous subcutaneous insulin infusion (CSII), or “insulin pump” therapy, is an alternative to multiple daily insulin injections (MDII) for management of diabetes. This study evaluates patterns of healthcare utilization, costs, and blood glucose control for patients with diabetes who initiate CSII.
Study Design: Pre-post with propensity-matched comparison design involving commercially insured US adults (aged 18-64 years) with insulin-requiring diabetes who transitioned from MDII to CSII between July 1, 2009, and June 30, 2012 (“CSII initiators”; n = 2539), or who continued using MDI (n = 2539).
Methods: Medical claims and laboratory results files obtained from a large US-wide health payer were used to construct direct medical expenditures, hospital use, healthcare encounters for hypoglycemia, and mean concentration of glycated hemoglobin (A1C). We fit difference-in-differences regression models to compare healthcare expenditures for 3 years following the switch to CSII. Stratified analyses were performed for prespecified patient subgroups.
Results: Over 3 years, mean per-person total healthcare expenditures were $1714 (95% confidence interval [CI], $1184-$2244) higher per quarter for CSII initiat Continue reading