Those with average insulin OOPC per 30‐day supply >$35 or $0 were more likely to have an insulin refill lapse versus OOPC of >$0 to $20, with odds ratios ranging 1.18 (95% CI 1.13–1.22) to 1.74 (95% CI 1.66–1.83) depending on OOPC group and diabetes type. The gene discussed is INS; the disease is diabetes mellitus.