About 70% of 340B participants have complied, the company said in its letter, adding that it has sent two follow-up letters to the approximately 1,000 covered entities that have not.

As seen during March's market decline, participants largely avoided sweeping changes despite heightened uncertainty. The April rebound shows that discipline carried forward as markets recovered.

As employers look for fresh approaches to control rising healthcare costs, proactive navigation and earlier risk intervention can help employees make better decisions.