1. What is Medicare Part C? Posted on September 11, 2017 at 12:08 pm.Written by advantage_admin It refers to Medicare Advantage plans. A Medicare Advantage plan (such as an HMO or a PPO) is a type of Medicare health plan offered by private companies under contract with Medicare to provide all Medicare Part A and Part B benefits and other services not covered by Original Medicare, such as dental. Many of these plans also offer prescription drug coverage. Most of these plans offer the benefits covered by Original Medicare at a lower cost within their provider networks.