The Centers for Medicare & Medicaid Services today opened registration for a May 12 webinar on its overall hospital quality “star ratings” methodology. During the 90-minute webinar, which begins at 1 p.m. ET, presenters will explain the methodology used to generate the summary rating for individual hospitals and changes to the preview reports for the next data preview period. CMS last week delayed the release of the ratings until at least July in response to concerns raised by the AHA, Congress and others about the methodology.