In May 2018, enrollment exceeded 44 million, including both those on standalone Part D and those enrolled in a Part C plan that includes Part-D-like coverage. About 20% of those beneficiaries are on an EGWP drug plan where a former employer receives a Part D subsidy on his or her behalf. The latter two groups lack the same freedom of choice that the standalone Part D group has because they must use the Part D plan chosen by the Part C plan's sponsor or their former employer.