Learn about Medicare Advantage plan changes taking effect for 2027, including how benefits, provider networks, drug formularies and out-of-pocket costs are updated each year. This informational guide explains the annual enrollment window, the Annual Notice of Change, and the plan details worth comparing before making any decision.
Medicare Advantage, also called Part C, is offered by private insurance companies that contract with Medicare. Each plan must cover everything Original Medicare Part A and Part B cover, and most bundle in Part D prescription drug coverage. Beyond that baseline, plans compete on extra benefits, provider networks and out-of-pocket costs, and those are the parts that change most from one plan year to the next.
Insurers reset their plan details annually. Premiums, deductibles, copays and coinsurance can all move. Provider networks are renegotiated, so a doctor or hospital that was in-network this year may not be next year. Drug formularies are rebuilt, meaning a medication can shift to a different cost tier or drop off the list entirely. Extra benefits such as dental, vision, hearing, fitness memberships, over-the-counter allowances and transportation are added, expanded or withdrawn depending on what the insurer can support.
Plans also carry an annual out-of-pocket maximum, which caps what a member spends on covered medical services in a year. Original Medicare has no such cap, and the limit differs between plans, so it is worth comparing directly.
Every Medicare Advantage member should receive an Annual Notice of Change from their insurer before the end of September. It sets out, line by line, what will differ in the coming plan year. Reading it matters: if a plan changes in a way that no longer suits someone's medications or doctors, the enrollment window is the time to act.
The Medicare Annual Enrollment Period runs from October 15 to December 7. Changes made during that window take effect on January 1. There is a second window, the Medicare Advantage Open Enrollment Period, from January 1 to March 31, during which someone already in a Medicare Advantage plan can switch to a different one or return to Original Medicare. Special Enrollment Periods may also apply after certain life events, such as moving out of a plan's service area.
Rather than looking at premium alone, it helps to work through a short list. Are current doctors and preferred hospitals in the network? Are current prescriptions on the formulary, and at what tier? What is the out-of-pocket maximum? Which extra benefits are actually likely to be used? What is the plan's star rating, the one-to-five quality measure Medicare publishes each year?
Plan types differ too. HMO plans generally require staying in network and using a primary care physician for referrals. PPO plans allow out-of-network care at a higher cost. Special Needs Plans are built for people with particular conditions or circumstances, such as those who also qualify for Medicaid.
Plan availability varies by county, so two people in the same state can see entirely different options. Official plan details, star ratings and cost comparisons are published by Medicare, and licensed agents can also walk through options. Anyone reviewing coverage should confirm specifics against official sources before enrolling.