Based on its analysis of state benchmark plans, Avalere said some states cover as little as 45 percent of available drugs, while others cover more than 99 percent.
"This means that ... linking drug coverage to the benchmark formulary will result in drastically different coverage requirements state-to-state," Avalere said.
Especially generous states include Virginia, Arizona, New Hampshire and Connecticut, as well as several rural states.
Some highly populated states offer comparatively skimpy drug coverage. The least generous category in Avalere's analysis — states whose benchmark plans cover 45 percent to 76 percent of drugs — includes California, Maryland, Michigan, Minnesota, North Carolina and Wisconsin.