If you enrolled to participate in Medicare anytime prior to March 25, 2011, be on the lookout for a letter from your Medicare Administrative Contractor (MAC) requesting you revalidate your enrollment.

JACKSON, Mich.--(BUSINESS WIRE)-- Anesthesiologists, nurse anesthetists and anesthesiologist assistants who last validated their enrollment in Medicare prior to March 25, 2011 are going to have to ...