Doing Nothing in AEP Still Changes Your Plan on January 1

What the Dec 7 deadline actually covers

Medicare's Annual Enrollment Period runs from October 15 to December 7 every year, according to the Centers for Medicare & Medicaid Services. That window is roughly two weeks old, and Dec 7 is under six weeks away. During it, you can switch from Original Medicare to a Medicare Advantage plan, move back, change from one Medicare Advantage plan to another, or add, drop, or change a Part D prescription drug plan. Whatever you choose takes effect January 1, as Medicare.gov explains. The key point is that the deadline is the last day to choose, not a day when anything happens automatically in your favor. If you take no action, your current plan generally continues into the new year, but it continues under its new-year terms. Those terms may differ from this year's in premiums, drug coverage, and which doctors and pharmacies are included. Staying put is a legitimate choice, but make it after reading what changed.

What a default renewal really means

Doing nothing is not freezing your plan in place. Your plan renews, but it can change premiums, copays, deductibles, the list of covered drugs (the formulary), and the network of doctors and hospitals. Federal rules require plans to send an Annual Notice of Change by September 30 and an Evidence of Coverage by October 15, per CMS. The notice is the short document that lists what is different next year; the Evidence of Coverage is the full contract. Many people set both aside as routine mail, which is how a drug moving to a higher cost tier or a favorite specialist leaving the network goes unnoticed until a January pharmacy counter or appointment. Because changes made during AEP take effect January 1, per Medicare.gov, the time to catch a problem is before December 7. The practical rule is simple: treat the notice as a bill preview. Find it, read the first pages, and compare them with how you actually used your coverage this year.

A worked example: the real cost of staying put

Here is a hypothetical example with made-up numbers. Suppose your plan charges a 30 dollar monthly premium this year and 38 dollars next year, per the Annual Notice of Change. That is 8 dollars more a month, or 96 dollars more over twelve months. Now suppose you take a brand-name drug that costs you a 45 dollar copay each month this year, and next year the plan moves it to a higher tier with a 70 dollar copay. That adds 25 dollars a month, or 300 dollars a year. Add the two: 96 plus 300 is 396 dollars in extra yearly cost before any other change. Now suppose a competing plan charges 42 dollars a month, covers the same drug at 45 dollars, and includes your doctors. Its premium is 12 dollars a month higher than this year, which is 144 dollars a year, and its drug cost adds nothing. Its total change is 144 dollars versus 396 dollars, so switching saves 252 dollars.

Common mistakes that cost money

The first mistake is assuming that a plan that worked this year will work next year. Plans can change their drug lists and networks every year, and the Annual Notice of Change is where those edits appear. The second mistake is comparing premiums only. A low monthly premium can come with higher drug costs or a narrower network, so the premium is one input among several. The third is checking only your plan and never looking at alternatives, even though AEP is the period when you can switch plans or move between Original Medicare and Medicare Advantage. The fourth is waiting until the last week. Plan comparison takes time, and a deadline of December 7 leaves little room if you also need to call your doctor's office or pharmacy to confirm participation. The fifth is forgetting that drug coverage is its own decision. Each of these errors is cheap to avoid and costly to discover in January.

How to check your own plan in 20 minutes

Gather four things: your Annual Notice of Change, your Evidence of Coverage, your current list of prescriptions with doses, and the names of your doctors and preferred pharmacy. Start with the notice and find the premium, deductible, and copay changes for next year. Then search your plan's drug list for each prescription and write down its tier and any restrictions such as prior authorization. Next, confirm with your doctors' offices that they will be in network for the plan next year, and ask the same of your pharmacy. Then open the Medicare Plan Finder on Medicare.gov, enter your prescriptions and pharmacy, and compare your plan's estimated total yearly cost against alternatives. Ask one question of every plan you consider: what would I pay in total, premium plus drugs, for the year? If the numbers or the paperwork confuse you, your State Health Insurance Assistance Program, known as SHIP and run through the Administration for Community Living, offers free counseling.

A simple decision rule before December 7

Once you have your numbers, the decision is straightforward. If your current plan's estimated total cost is competitive, your drugs are covered at acceptable tiers, and your doctors and pharmacy remain in network, keeping the plan is a sound decision. If any of those three checks fails, compare at least two alternatives using the same method as the worked example: add the change in yearly premium to the change in yearly drug cost, then weigh the difference against how much you value keeping a doctor. If you switch, the new plan's coverage starts January 1, according to Medicare.gov. Set yourself a deadline a week ahead of December 7 so a missing document or an unanswered call to a doctor's office does not push the decision to the last day. The takeaway for the whole piece is this: doing nothing is a decision to accept next year's plan terms, so read your Annual Notice of Change before you let it stand.

For general education only. The cost figures in the worked example are hypothetical and not tied to any real plan. Plan benefits and costs vary by plan and location; confirm details with your plan, Medicare.gov, or your State Health Insurance Assistance Program (SHIP).