Under the ACA, all Medicare fee-for-service claims for services furnished on or after January 1, 2010 must be filed with the appropriate Medicare contractor no later than one calendar year from the date of service or the claim will be denied. CMS is reminding providers and suppliers that Medicare claims with service dates from October 1, 2009 through December 31, 2009 must be filed by December 31, 2010 in order to be eligible for payment.