Medicare Open Enrollment Checklist: 9 Things to Compare Before December 7

A retired couple in Ohio opens the plan letter that arrived in late September and finds three changes at once: a favorite doctor is leaving the network, one inhaler is moving to a higher cost tier, and the monthly premium is rising. None of those changes takes effect until January, but the deadline to choose different coverage is December 7. Reading that letter early is the difference between comparing nine concrete things and making a rushed call in the last week.

Medicare Open Enrollment runs from October 15 through December 7, and changes you make take effect on January 1 of the next year, according to Medicare.gov. This checklist is the broad decision pass for that window. It is not a walkthrough of any comparison tool, and it does not assume that switching is always wise. Staying in a plan that still fits can be the right answer, but it should be a checked answer rather than an accident of not opening the mail.

First, read what your current plan already decided

Your plan sends an Annual Notice of Change and an Evidence of Coverage each year. Medicare's official handbook, Medicare and You 2027, directs members to review both: the notice summarizes changes in coverage, costs, and service area for the coming year, while the evidence document gives the detailed rules for what the plan covers and what you pay. Start by circling anything that touches a service, drug, pharmacy, or clinician you actually used this year. A benefit you never use can change without changing your life. A small change to a drug you take daily can matter more than a large change to a headline benefit.

Then write down what you paid this year beyond premiums. Include deductibles, copayments, coinsurance, dental or hearing costs the plan did not cover, and any bill you received after a denied or out-of-network service. People often compare only next year's premium because it is the easiest number to find. The plan that looks cheaper each month can cost more over a year if it raises the cost of the two services you use most. Your past claims are not a perfect forecast, but they are a better starting point than a brochure.

That review sets up the first three comparisons. Check the total premium picture for the year, including the Part B premium you will owe either way. Check whether your doctors, hospital, and specialists remain in network and accepting the plan. And check whether any referral or prior authorization rule is changing for the care you expect, because a covered service that needs new approval can create delay even when the final copayment looks low.

Drugs deserve their own afternoon

Prescription coverage changes quietly. A plan can move a drug to a different tier, add a quantity limit, require step therapy, or stop covering a drug in the form you take. Bring a current medication list with the exact name, dose, frequency, and pharmacy to the comparison. A drug listed as covered is not the same as your dose covered at your pharmacy at the price you expected. If a medicine was removed, ask your prescribing clinician whether an alternative on the formulary is medically appropriate, and ask the plan what exception process applies if it is not.

The official 2027 drug cost frame helps you judge the stakes. Medicare.gov states that no Medicare drug plan may have a deductible higher than $700 in 2027, up from a maximum of $615 in 2026, and some plans have no deductible. After the deductible stage, you generally pay 25 percent coinsurance for covered generic and brand drugs until your out-of-pocket spending on covered Part D drugs reaches $2,400 in 2027. At that point, catastrophic coverage begins and you pay nothing out of pocket for covered Part D drugs for the rest of the calendar year. The $2,400 cap for 2027 replaces the $2,100 cap in 2026.

Those are maximums and national rules, not your plan's price list. Your premium, deductible, pharmacy network, and copayments still vary by plan. Medicare also offers a Prescription Payment Plan option that spreads covered drug out-of-pocket costs across monthly bills during the calendar year instead of paying at the pharmacy. It does not lower the total you owe, and your monthly bill can rise when you fill a new prescription later in the year because fewer months remain to spread the balance. It is a cash-flow tool, not a discount, so judge it by whether smoother bills help you stay on prescribed medicines.

That is the fourth, fifth, and sixth comparison: every drug and dose, the pharmacy you will actually use including mail order rules, and the full year drug cost under the deductible and the $2,400 cap rather than the first fill in January. If you receive Extra Help with drug costs, confirm how the plan works with that help before switching, because changing plans can change what you pay even when the drug stays covered.

Networks, approvals, and the care you cannot postpone

For Medicare Advantage plans, the network is not a footnote. Confirm each clinician by name and location, confirm the hospital you would want for surgery or an emergency admission, and ask whether laboratory, imaging, therapy, and durable medical equipment suppliers you use are in network. A directory entry can be outdated, so calling the clinician's billing office is worth the time for the providers who matter most. Also ask what happens if you spend part of the year elsewhere. Emergency and urgent care rules differ from routine out-of-state care, and a low premium is poor compensation for learning that distinction during a winter away.

Prior authorization deserves the same direct question. Ask which of your expected services, drugs, or equipment require approval in 2027, how long approval usually takes, and what happens if care is urgent. If you have a procedure already being discussed for early next year, raise it with both the clinician and the plan before you switch. Changing plans on January 1 does not guarantee that an authorization from the old plan carries over. That transition question is easy to miss because enrollment centers on coverage dates, while care often runs on its own schedule.

Original Medicare changes the comparison rather than removing it. With Original Medicare, you can generally use any doctor or hospital in the United States that accepts Medicare, and you may buy supplemental Medigap coverage to help with out-of-pocket costs if you are eligible to do so. You cannot use a Medigap policy with a Medicare Advantage Plan. Medicare and You 2027 also notes that Medicare Advantage plans have a yearly limit on out-of-pocket costs for covered services, while Original Medicare has no such yearly limit unless you have supplemental or other coverage. Neither structure is automatically safer. One controls risk through a plan maximum and network rules. The other controls it through broader access and, for many people, extra supplemental premiums.

Extra benefits, service area, and the January second chance

Dental, vision, hearing, fitness, transportation, and over-the-counter benefits can be valuable, but value them at what you will use. A generous allowance that expires, requires a specific vendor, or covers only part of a service may be worth less than a smaller benefit you already know how to claim. Check whether unused amounts carry over, whether your dentist or hearing provider participates, and whether the benefit replaces something you would otherwise buy. Count it once, at a realistic amount, and do not let a gift-like benefit outweigh a drug or doctor problem you will face every month.

Service area is the seventh and eighth comparison together with travel. If you are moving, spending long periods at a second address, or relying on a specialist across a state line, tell the plan the exact ZIP codes involved. Moving out of a service area can create separate enrollment rights outside the fall window, but the details depend on your situation, so do not rely on a general article for a move date. Ask the plan and Medicare how the move affects your current coverage before you give up the old address or stop paying a premium.

There is also a limited second window for some people. From January 1 through March 31, a person already in a Medicare Advantage Plan can make certain changes, such as switching to another Medicare Advantage Plan or returning to Original Medicare and joining a separate drug plan. That Medicare Advantage Open Enrollment Period is not the same as the fall window and it is not available to everyone in the same way. Treat it as a safety valve, not a strategy. If you know a plan does not fit, December 7 remains the deadline that protects the widest set of choices for January 1.

The last three checks before you enroll

Ninth on the checklist is the confirmation trail, and it deserves to be done before the final week. If you enroll in a new plan, note the plan name, the date and method of enrollment, any confirmation number, and when the new coverage should appear. Medicare.gov says the plan must receive your enrollment request by December 7 for a fall change to take effect January 1. Keep the summary of benefits and the evidence document for the plan you chose, not just the advertisement that led you there. If expected changes do not appear in your account shortly after the start of the year, contact the plan promptly while the paperwork is still easy to trace.

Be careful with help. Free counseling is available through State Health Insurance Assistance Programs, known as SHIPs, which provide local one-on-one Medicare guidance. You can also call 1-800-MEDICARE or use Medicare.gov. If a salesperson pressures you to decide on the spot, refuses to put an offer in writing, or asks for payment to enroll you, slow down. Medicare plans are not sold through threats about losing current coverage tomorrow, and a legitimate comparison can survive a night of thought and a call to a clinician's office.

Finally, do not cancel anything by assumption. Joining a new Medicare Advantage or drug plan generally moves your enrollment for the new year under the rules Medicare describes, but employer, retiree, union, Medicaid, and supplemental coverage can interact in ways that carry real consequences. If any other coverage is in the picture, ask that plan's benefits administrator what happens if you join, switch, or drop a Medicare plan. Losing retiree coverage can sometimes be permanent, and no premium saving is worth discovering that afterward.

Make the nine comparisons while there is still time to call a pharmacy, a billing office, and your plan. If your current coverage passes each check, staying put is a successful enrollment season. If it fails one that matters, change before December 7 and keep the confirmation until the new coverage is working.