The insurer’s stock sank to its lowest level in more than a decade after the federal government lowered the rating for one of its most popular plans.

Humana’s stock was headed for another sharp selloff on Tuesday, toward a more than four-year low, after the government cut its rating on one of the health insurer’s large Medicare Advantage plans because it missed some performance measures.

The AEP is a great time to reassess your Medicare Advantage plan options. Whether you’re considering switching from a current Medicare Advantage plan to Original Medicare or exploring different Medicare Advantage plan options that better fit your needs, you have the opportunity to find a plan that works for you.