Looking to shave Medicaid costs, Pennsylvania was considering making a preferred drug list (PDL), which designates a single treatment for each medical condition, usually a generic drug. Essentially, the list limits enrollees to a select group of drugs and either bars or makes difficult the ability to access drugs not on the list.

Unlike PDLs in other states, Pennsylvania was exploring the inclusion of hemophilia treatments. But hemophilia doesn't have a generic treatment; patients use a combination of six different "clotting" ...