Outpatient insulin-related adverse events due to mix-up errors: Findings from two national surveillance systems, United States, 2012-2017.

Among all ED visits for insulin errors collected by NEISS-CADES in 2012-2017, the proportion involving mix-up errors has declined. Continued reductions may require additional prevention strategies, including improving insulin distinctiveness, particularly for rapid- vs long-acting insulins. Ongoing national surveillance is important for identifying the impact of interventions.