On May 21, 2010, CMS issued guidance to state survey agencies clarifying CMS requirements for ambulatory surgical center (ASC) waiting areas, including the prohibition on the sharing of waiting areas with other entities. The guidance also discusses opportunities for existing ASCs that have waiting areas shared with other entities to obtain waivers as part of their Plan of Correction when violations have been cited, and when it is not feasible for the ASC to correct the deficiencies.