Medicare Advantage plans (Part C) are Medicare approved health plans sold by private insurers that replace original Medicare by providing all Part A and Part B benefits and commonly include prescription drug coverage, care coordination, and extra services such as dental, vision, hearing, and wellness programs; vary by type (HMO, HMO-POS, PPO, PFFS, DSNP, CSNP), have their own provider networks and cost structures , and may charge a monthly premium in addition to the monthly Part B premium.