If you haven't had to revalidate your Medicare enrollment yet, you will soon. "Between now and March 23, 2013, MACs will send out notices on a regular basis to begin the revalidation process for each provider and supplier," HHH MAC Palmetto GBA notes in an Aug. 8 post to its website. The post reviews revalidation information contained in MLN Matters Article No. SE1126. "Please note that 42 CFR 424.515(d) provides CMS the authority to conduct these off-cycle revalidations," the post says.