Medicare Open Enrollment 2027: How to Compare Plans, Costs, Drug Coverage, and Deadlines

The Medicare Open Enrollment Period for 2027 coverage is October 15 through December 7, 2026. If you already have Medicare, this is your annual opportunity to review and, when permitted, change a Medicare Advantage plan, a standalone Part D prescription drug plan, or the way you receive Medicare coverage. Changes submitted on time generally take effect January 1, 2027. You do not have to change plans every year, but you should review your coverage even if you are satisfied with it today.

That review matters because the lowest advertised monthly premium is rarely the whole story. A plan with a $0 extra premium might have a narrower doctor network, higher specialist copays, drug restrictions, or a larger annual limit on covered medical spending. Meanwhile, a plan that costs more each month may be less expensive over a full year for someone who takes several prescriptions or expects regular appointments. The practical goal is not to find the plan with the prettiest advertisement: it is to find coverage that fits your medical needs and realistic annual budget.

Important: This is independent educational information, not personalized insurance, legal, medical, or financial advice. Horus Valley is not Medicare, CMS, an insurance company, or an enrollment agent. Never enter a Medicare number into a third-party article or comparison form. Compare real plans through the official Medicare Plan Finder or speak with your state’s free SHIP counseling program.

Medicare Open Enrollment 2027: dates at a glance

These dates come from Medicare’s official Open Enrollment guidance. The date on which a website was visited or a paper form was mailed is not necessarily the date a plan receives the request. Avoid leaving enrollment until the final hours, especially if you are mailing paperwork or need help resolving an identity or eligibility issue.

What Open Enrollment allows you to change

During the October 15–December 7 window, someone who qualifies can generally:

• Switch from one Medicare Advantage plan to another Medicare Advantage plan.
• Join or drop a Medicare Advantage plan and change between Medicare Advantage and Original Medicare.
• Switch a standalone Medicare Part D prescription drug plan if they have Original Medicare.
• Add, drop, or change qualifying drug coverage within Medicare’s rules, taking late-enrollment penalties and other existing coverage into account.

This period is not the same as first signing up for Medicare Part A or Part B. Those parts have their own Initial Enrollment, General Enrollment, and Special Enrollment rules, often administered through Social Security. Someone turning 65, leaving employer coverage, or enrolling in Part B for the first time should check the correct enrollment route rather than assuming the fall window solves every issue. Start at Medicare’s Part A and Part B sign-up guidance.

What changed for Medicare plans in 2027?

CMS released a national overview of Medicare Advantage and prescription drug plan choices on September 28, 2026. It projected lower average Medicare Advantage premiums and relatively stable standalone Part D premiums. Those are population-level projections, not a promise about the premium, availability, drug formulary, hospital network, or deductible for a specific ZIP code or person.

Sources: CMS 2027 marketplace outlook and Medicare’s Part D cost rules. A national average cannot tell you whether a plan that served your county in 2026 is still available in 2027. Plans can enter or leave markets, and each plan’s benefits and covered drugs can change.

What the $2,400 drug spending threshold does—and does not—mean

For 2027, Medicare lists a $2,400 threshold for qualifying out-of-pocket costs on covered Part D medications. Once the threshold is reached under the Part D benefit rules, covered drugs enter the catastrophic coverage stage and you generally pay $0 for those covered Part D drugs for the remainder of the calendar year.

This does not mean that every health care expense is capped at $2,400. It does not replace Part B costs, a Medicare Advantage plan’s separate medical maximum out of pocket, premiums, drugs outside the applicable coverage rules, or noncovered services. Not every dollar you hand over at a pharmacy counts toward the threshold in the same way. The benefit is technical; use the personalized drug-cost estimate in Plan Finder and check the official Part D cost explanation.

Also, a $700 deductible is the maximum, not a fixed amount you must pay. A plan can have a lower deductible or no deductible for some or all covered drugs. The actual charge depends on its 2027 Evidence of Coverage, drug tiers, pharmacy network, and any assistance you receive.

Part B premiums are a separate consideration

A Medicare Advantage advertisement that says “$0 monthly plan premium” does not ordinarily remove the obligation to pay Medicare Part B’s monthly premium. Some plans may offer a Part B premium-reduction benefit, but its conditions and value vary. People with higher income may also owe an income-related adjustment (IRMAA) on Part B and Part D. Do not copy an old year’s standard Part B dollar figure into a 2027 household budget; check the current Medicare costs page or the official notice for the actual amount.

Original Medicare versus Medicare Advantage: the decision before choosing a company

Many shoppers jump directly to an insurer name and never examine the larger structural choice. Original Medicare generally means Part A hospital coverage and Part B medical coverage, with the option of a separate Part D plan and—if available and eligible—Medigap supplemental insurance. Medicare Advantage (Part C) is a Medicare-approved private alternative that combines Part A and Part B benefits through a plan and commonly includes Part D drug coverage.

The official Medicare side-by-side comparison provides the full framework. Neither pathway wins for everyone. People who see physicians in several states may value Original Medicare’s provider flexibility; others may prefer a particular Medicare Advantage network and its defined medical spending limit. The correct answer depends on actual availability, doctors, treatment patterns, drugs, supplemental coverage, and total costs.

A critical Medigap warning before switching

The annual Medicare Open Enrollment window does not create a universal right to buy a new Medigap policy with no medical underwriting. Federal and state protections vary according to when and why you are purchasing it. In many situations, an insurer may be allowed to evaluate health history or refuse coverage, unless a guaranteed-issue right or state-specific protection applies.

If you have Medicare Advantage and intend to return to Original Medicare, confirm any Medigap eligibility and effective date before giving up existing protection. If you already have Medigap, do not cancel it just because an advertisement says you can switch back later. Trial rights and state rules may help some people but not everyone. See Medicare’s explanation of how Medigap works and contact your SHIP counselor for state-specific help.

How to use Medicare Plan Finder for 2027: step by step

The official Medicare.gov Plan Finder is the practical starting point. It displays plans by geographic service area and supports personalized drug-cost estimates. Plans available to one person can be completely different from those advertised to someone in another county or ZIP code.

1. Open https://www.medicare.gov/plan-compare/ directly in your browser rather than following a sales text or unsolicited email.
2. Choose 2027 as the year of coverage, when prompted, and enter your ZIP code. Confirm the county if you are given multiple options.
3. Select the type of coverage to compare. Know whether you are shopping for Medicare Advantage, a standalone Part D drug plan, or a Medicare Supplement (Medigap) policy.
4. If you have an official Medicare account, signing in may bring forward your saved drugs, pharmacies, and existing coverage. You can also begin without signing in, but personalization may be more limited.
5. Add every prescription drug you take, with the exact name, strength, dosage and approximate refill frequency. A brand name and a generic may have very different formulary placement.
6. Add the pharmacies you realistically use, including your preferred local pharmacy and mail-order options if relevant. A network pharmacy may not be a preferred-cost-sharing pharmacy.
7. Inspect the estimated yearly drug cost, not just the drug plan’s premium. Then open each promising plan’s details to review its formulary, deductible, tier structure, quantity limits, step therapy, and prior authorization.
8. For Medicare Advantage, verify your doctors and facilities using the plan’s current provider directory and by asking the provider and insurer directly. Do not assume a doctor will remain in-network merely because the practice accepted last year’s card.
9. Compare the annual limit on covered medical out-of-pocket costs, specific copays for services you use, hospitalization cost structure, referral rules, and prior-authorization requirements.
10. Save or print the comparison and plan name/ID. Before submitting a change, verify that you are looking at the 2027 benefits, then use Medicare’s Enroll option, the plan’s official enrollment process, or call 1-800-MEDICARE.

Do not skip the drug and pharmacy steps. A low-premium plan can become expensive if a regularly used medication changes tier, is nonformulary, requires approval, or is cheapest at a pharmacy you cannot conveniently use.

Medicare’s joining-a-plan instructions also explain enrollment by phone and how to obtain free, unbiased SHIP counseling.

Compare total yearly costs, not only premiums

You cannot accurately estimate next year’s costs from the advertised monthly premium alone. Think in separate columns: insurance premiums, routine copays, deductibles, drugs, expected recurring services, and the downside if you need more expensive care than expected. A person who expects six specialist visits is in a different situation from someone who rarely leaves town and has no ongoing prescriptions.

A useful illustrative budget, not a quote, could look like this:

In this hypothetical case, Plan B’s higher premium does not make it more expensive overall. These invented figures are a math example only; they are not real insurance offers, complete annual medical budgets, guaranteed costs, or a recommendation. For serious financial decisions, compare the actual plan estimates and consider the possibility of an unexpected hospitalization. The annual maximum out of pocket is a key risk measure, not what the average member necessarily spends.

A practical medical cost worksheet

Before you open Plan Finder, list your current specialists, expected follow-ups, preferred hospital, durable medical equipment, recurring tests, and any surgeries or therapies you expect to discuss with your clinicians. Estimate the number of visits, not merely whether the plan says a service is covered. Ask specifically what you pay for a specialist visit, imaging, an emergency visit, ambulance transport, inpatient stay, outpatient surgery, or skilled nursing care, as relevant.

For drugs, write the exact prescription name, dose and frequency and whether you need a specific brand for medical reasons. Include expensive injectables and specialty medications. A Part B-administered drug may have different coverage mechanics from a Part D prescription; do not automatically place all drug costs under the Part D $2,400 threshold.

Check your Annual Notice of Change and Evidence of Coverage

If you are currently enrolled in a Medicare Advantage or Part D plan, find your Annual Notice of Change (ANOC) and Evidence of Coverage (EOC) for 2027. The annual materials explain updates to benefits, costs, coverage rules, pharmacies, formularies, networks, and other terms. The EOC is a detailed contract-like description, not a marketing brochure.

Search the documents for your drugs and pharmacy names, not only the first page listing premiums. Verify whether a deductible has changed, whether a favorite specialist remains in-network, and whether your chronic-condition services are subject to a new prior authorization. Keep copies or digital screenshots of relevant pages. If a letter says the plan will not continue in your area, treat that as time-sensitive: you may have special options beyond ordinary Open Enrollment, but the details depend on your notice and circumstances.

If you cannot find the EOC, Medicare explains when plans send it. Contact the insurer for the exact document for your 2027 plan name and ID, not an archived 2026 description.

How to evaluate prescription drug coverage for 2027

Prescriptions frequently drive the biggest surprise at renewal time. A formulary is the list of covered drugs and their conditions. Plans can differ in how they classify expensive medications, whether they apply a deductible to a specific tier, or which pharmacies provide the lowest copay. Even when two plans cover a drug, the projected annual cost can vary considerably.

Compare these issues in order:

• Formulary status: Is the exact drug and formulation covered under the 2027 plan, and at what tier?
• Deductible: Does the plan have one, and does it apply to the tier for this medicine?
• Utilization management: Is prior authorization, step therapy, or a quantity limit in place?
• Pharmacy price: Is the location preferred, standard in-network, or out-of-network?
• Annual estimate: Does Plan Finder include all of your drugs and the realistic refill schedule?
• Transitions: If a drug is changing coverage, ask the plan and your prescriber about transition supplies, exception requests, and medically appropriate alternatives; do not stop therapy on your own.

The official Part D costs explainer includes the 2027 deductible and out-of-pocket threshold. If a medication is unusually costly, ask the plan about a coverage determination and seek the prescribing clinician’s input before assuming the insurance decision cannot be reviewed.

What if you take no prescription drugs?

Even if you currently take no medications, going without creditable prescription drug coverage can lead to a Part D late-enrollment penalty after a qualifying gap—generally 63 or more consecutive days without other creditable coverage once eligible. Do not drop drug coverage merely to save a monthly premium without understanding the implications. Employer or union coverage may be creditable; obtain written confirmation from the benefits administrator. Medicare explains the rules for switching or dropping drug plans.

What if your doctor or hospital is leaving the plan’s network?

An in-network primary care doctor in 2026 may no longer accept the same plan in 2027. Never rely on an outdated directory alone. Call your physician’s office and ask about the exact plan and network for 2027, then verify the answer with the health plan. If you use a hospital for regular treatment, check both the hospital and individual doctors. Ask about your preferred specialists, labs, imaging locations, and any facilities you use while traveling.

For complex conditions or continuing treatment, inquire about continuity-of-care protections or transition arrangements that may apply to your situation. Do not cancel appointments or interrupt ongoing treatment while you compare plans. The best next step may be an insurer-approved transition process, which has its own requirements and deadlines.

If you have Original Medicare, the network question usually looks different because you can generally use providers that accept Medicare nationwide. But verify that your clinicians accept Medicare and the terms of assignment; out-of-pocket exposure can still exist, especially without supplemental coverage.

What if your Medicare Advantage plan is ending in 2027?

If your plan tells you that it will not be offered next year, read the termination or nonrenewal notice fully. It should explain what is happening to the coverage and may describe a Special Enrollment Period or Medigap guaranteed-issue rights that apply in your case. A plan leaving your county is not the same as you voluntarily deciding to switch plans.

A practical response is to confirm the plan end date, compare the options actually available in your county, verify drug and provider coverage, and submit an enrollment request with time to spare. Keep the notification and confirmation documents. If you are leaving Medicare Advantage for Original Medicare, pay particular attention to whether a separate Part D plan is needed and whether you have special Medigap rights. These protections are fact-specific; ask SHIP or Medicare before assuming a right applies.

Medicare Advantage Open Enrollment is different from fall Open Enrollment

People already in a Medicare Advantage plan have a separate January 1–March 31, 2027 Medicare Advantage Open Enrollment Period. It generally permits one change: switch to another Medicare Advantage plan, or drop Medicare Advantage and return to Original Medicare with the option to join a standalone Medicare drug plan. Coverage normally becomes effective on the first day of the following month after the new plan receives the request.

This period does not generally let people with Original Medicare switch to Medicare Advantage, and it does not serve as an unrestricted opportunity to switch standalone Part D plans while remaining in Original Medicare. See the official Medicare enrollment-period rules.

Do not plan to correct every fall mistake in February. Your options may be limited, and a person moving to Original Medicare may face additional Medigap complexities. The safest strategy is to make a well-checked decision before December 7.

Avoid Medicare enrollment mistakes that are easy to make

For clarification on the last-but-one item: Medicare’s annual Open Enrollment is different from the Affordable Care Act Marketplace window. Medicare explains the separation on its Medicare and Marketplace page.

How to enroll after choosing a plan

Once you have selected a plan, use official channels rather than an unverified online lead form. Medicare lists three main ways to join an eligible health or drug plan: use the plan’s Enroll function in Medicare Plan Finder, contact the plan directly through its verified contact channels, or call Medicare at 1-800-MEDICARE (1-800-633-4227); the official TTY number is 1-877-486-2048.

Have your Medicare card ready during the official enrollment process, but do not share a card number with callers who contacted you unexpectedly. Confirm the plan’s complete name and plan ID, the date coverage is meant to start, drug coverage selection, and any special requirements. Note the date, time, confirmation number, and the name of the representative if speaking by phone.

If you enroll in a new Medicare Advantage or standalone Part D plan to replace another, joining the new plan typically causes the old corresponding plan coverage to end when the new coverage begins. Do not accidentally cancel a plan too early without confirming the process, especially when other insurance is involved. Medicare’s switching guidance explains these procedures.

What to do after enrollment is confirmed

Save the email or letter confirming enrollment. Watch for a new membership card and plan documents and check that any premiums are billed appropriately. Before January, verify how you will refill medications during the year-end transition. Recheck your doctors’ offices, pharmacy details and any preauthorizations. On January 1, 2027, confirm the correct plan is active before obtaining nonurgent services. If your new card or pharmacy claims do not work, contact the insurer and Medicare promptly rather than paying a large unexpected bill without asking how the issue should be handled.

What if you miss the December 7 deadline?

In most cases, someone who misses the annual enrollment window cannot simply change Medicare Advantage or Part D plans at any time. However, Special Enrollment Periods (SEPs) may be available after qualifying events, such as moving out of a plan service area, losing certain other coverage, or being affected by particular exceptional circumstances. Different SEPs have different deadlines and permitted changes.

People already enrolled in Medicare Advantage may have the separate January–March change opportunity described above. People in Original Medicare generally cannot use that same window to switch standalone Part D plans without a separate qualifying reason. Start with Medicare’s Special Enrollment Period guidance, call 1-800-MEDICARE, or ask SHIP. Do not invent a qualifying event or rely on an agent who guarantees an exception without examining the facts.

Help with premiums and prescription costs: Extra Help and other programs

If income or savings make Medicare coverage difficult to afford, ask whether you qualify for Extra Help with Part D prescription costs or a Medicare Savings Program to help with certain Medicare expenses. Medicaid and some state programs can also interact with Medicare eligibility. The income and resource tests vary by program and sometimes by state; using a stale table from last year can give the wrong answer.

Medicare’s 2027 Extra Help cost page lists eligible people’s prescription copays and describes how assistance works. Apply through official programs rather than paying a broker to find out whether you qualify. Also review Medicare Savings Programs and your state Medicaid agency’s eligibility rules.

Can the Medicare Prescription Payment Plan help?

The Medicare Prescription Payment Plan allows eligible people with Medicare drug coverage to spread certain out-of-pocket Part D drug expenses across the calendar year rather than pay the pharmacy at the time of pickup. Participation is voluntary and free, but it does not reduce the underlying cost of the medication; you still owe the applicable amounts to the plan over time. It can be useful for cash-flow planning if expensive prescriptions arrive early in the year. It is not a replacement for Extra Help or a guarantee that a particular drug will be covered.

Where to get impartial help—and how to avoid scams

The State Health Insurance Assistance Program (SHIP) provides free, one-to-one Medicare counseling and is not affiliated with a specific insurance plan. A counselor can help you read notices, compare coverage in your county, understand Medigap timing and investigate eligibility for assistance. Find your local program at SHIPHelp.org or through Medicare’s helpful tools page.

Be cautious about calls that promise special government benefits in exchange for a Medicare number, Social Security number or banking details. Medicare has marketing rules for private plans, and an agent should not pressure you to sign a form before you are ready. If you receive misleading information, contact Medicare, document the sales claims and ask what remedies may apply. Do not assume that a flashy “official” logo on a website means it is run by the government.

Printable 2027 Medicare comparison checklist

Use this before December 7, 2026. Keep the worksheet private: it can include sensitive health details.

• Confirm the 2027 plan year, your ZIP code and county.
• Find your plan’s Annual Notice of Change and Evidence of Coverage.
• Compare Original Medicare with Medicare Advantage if considering changing how you receive coverage.
• Verify every important physician, hospital, laboratory and specialist with the insurer and provider.
• Enter all medications with exact doses and the pharmacies you actually use.
• Examine formulary tiers, prior authorizations, quantity limits, deductibles and yearly drug estimates.
• Include Part B premiums, any Part D/Advantage premiums and any income-related adjustments.
• Review ordinary visit copays and the health plan’s maximum annual out-of-pocket exposure.
• Check whether you would lose employer, union, retiree, Medicaid or Medigap rights by switching.
• Ask whether Extra Help, a Medicare Savings Program, or the Prescription Payment Plan could help.
• Confirm the plan ID and enrollment method; submit in advance of the December 7 deadline.
• Save written confirmation and verify benefits when coverage begins January 1, 2027.

A practical way to make your 2027 decision

A useful decision process has three rounds. Round one eliminates any plan that fails an essential test, such as not covering a medically necessary medication or placing your main doctor outside the usable network. Round two estimates annual expected costs based on your actual drugs, visits, premiums and pharmacy. Round three checks financial exposure in a worse-than-usual year, including medical out-of-pocket limits and the terms governing major services. That is more reliable than comparing monthly premiums alone.

Finally, remember the limits of any guide—including this one. Plan benefits, formularies and provider contracts are specific to your county and may change. The published CMS national averages offer context, but your best plan is determined by your own 2027 plan choices and needs. Before enrolling, verify everything through Medicare.gov and the plan’s current 2027 documentation. If you are uncertain about switching from Medicare Advantage to Original Medicare or buying Medigap, seek free SHIP guidance first. The deadline for annual changes is December 7, 2026, and those changes generally start January 1, 2027.

Official sources and further reading

• Medicare.gov — Annual Open Enrollment dates and allowed changes
• Medicare.gov — 2027 Plan Finder
• CMS — Medicare Advantage and Part D 2027 national landscape and premiums
• Medicare.gov — Part D premiums, deductibles and spending stages
• Medicare.gov — Original Medicare and Medicare Advantage comparison
• Medicare.gov — How to join a health or drug plan
• Medicare.gov — Learn how Medigap works
• Medicare.gov — Drug plan switching and penalties
• Medicare.gov — The Medicare Prescription Payment Plan
• Medicare.gov — Extra Help for drug costs
• Medicare.gov — Medicare Savings Programs
• Medicare.gov — Special Enrollment Periods
• Medicare.gov — Private-plan marketing rules
• SHIP — Independent local Medicare counseling