"March 1, 2015 is a Sunday, and we expect that CMS will say that filings made for calendar year plans on Monday, March 2, 2015 are timely. CMS has not announced that, however, so cautious calendar-year plan sponsors will want to complete the online filing no later than March 1. A CMS filing is also required within 30 days of termination of a prescription drug plan and for any change in a plan's creditable coverage status. Some plans are exempt from the filing requirement."