In February 2008, Dean Butler announced that "beginning in fall 2008 the Graduate School will fund the full health award for families with children and will continue to fund the full health award for single students and 50% of the two-person plan for spouses or domestic partners." 

Based on what we've known single students to have received for the past few years, we take "full health award for families" to mean Yale Health Plan's Basic and Hospitalization-Specialty Care Plans.  The Grad School doesn't cover single students' Prescription Plus plans, so we assume that likewise, Prescription Plus won't be covered from graduate parents' families.