Medicare Open Enrollment runs from October 15 through December 7 each year. Changes you make during that window usually start January 1.

For 2027 coverage, the smartest move is not to wait until the last week of enrollment. Start by reading your Annual Notice of Change, updating your medication list, checking doctors and pharmacies, and comparing your current plan against the options available for next year.

If your plan still fits, staying put may be fine. The mistake is renewing without checking.

What Is Medicare Open Enrollment?

Medicare Open Enrollment is the annual window when most people can change Medicare Advantage or Part D drug coverage for the next year.

During this window, Medicare says you can generally:

  1. switch from Original Medicare to Medicare Advantage
  2. switch from Medicare Advantage back to Original Medicare
  3. change from one Medicare Advantage plan to another
  4. join, drop, or switch a Part D drug plan

The window runs from October 15 through December 7. Coverage changes usually take effect January 1.

If you need the broader timing rules first, read Can You Change Medicare Plans Anytime?.

What Should You Do Before October 15?

Do the prep work before plan comparison gets busy.

By early fall, I would have these items ready:

  1. your current Medicare Advantage or Part D plan name
  2. your Annual Notice of Change, if you already have a plan
  3. your current doctors and preferred hospitals
  4. your prescription list with dosage and quantity
  5. your preferred pharmacy and one backup pharmacy
  6. any dental, vision, hearing, or over-the-counter benefits you actually use
  7. your expected medical needs for the coming year

That information makes the comparison much cleaner. Without it, people tend to shop from memory, and memory is not precise enough for Medicare plan decisions.

Start With the Annual Notice of Change

If you already have a Medicare Advantage plan or Part D plan, your Annual Notice of Change is the first document to open.

It tells you how your current plan says it will change for the next year. Medicare says plans send this notice in September, and the printed notice is generally due by September 30.

Check for changes to:

  1. premium
  2. deductible
  3. copays and coinsurance
  4. maximum out-of-pocket limit
  5. doctor or hospital network
  6. drug formulary
  7. pharmacy network
  8. prior authorization, step therapy, or quantity limits
  9. dental, vision, hearing, and over-the-counter benefits

If the notice looks minor, still compare. A small plan change can matter if it touches one doctor, one hospital system, or one expensive medication.

For a deeper walkthrough, read What Is the Medicare Annual Notice of Change?.

Update Your Medication List

Part D mistakes often start with an incomplete drug list.

Before comparing 2027 coverage, write down:

  1. each medication name
  2. dosage
  3. quantity per refill
  4. how often you refill it
  5. whether it is brand-name or generic
  6. the pharmacy you prefer
  7. any medication you expect to start or stop before January

Then check each plan’s formulary. Do not assume your current drug plan will cover the same medications the same way next year.

If prescriptions are the main issue, these two guides are useful:

  1. How to Compare Medicare Part D Plans Without Guessing
  2. What Is a Medicare Part D Formulary?

Check Doctors Before Benefits

Extra benefits can get attention, but the core Medicare Advantage question is still whether the plan works for your care.

Before switching or renewing a Medicare Advantage plan, verify:

  1. your primary doctor
  2. specialists
  3. preferred hospital
  4. clinic system
  5. referral rules
  6. prior authorization rules
  7. out-of-network rules

Do not rely only on a general statement like “your doctor takes Medicare.” Original Medicare and Medicare Advantage networks are not the same thing.

If your doctor access is the deciding issue, compare the bigger tradeoff in Medicare Advantage vs Medigap in the Kansas City Area.

Compare Total Cost, Not Just Premium

A low premium can still be expensive if the plan shifts costs elsewhere.

When reviewing 2027 options, compare:

  1. monthly premium
  2. medical deductible
  3. drug deductible
  4. primary care and specialist copays
  5. hospital copays
  6. outpatient surgery or imaging costs
  7. maximum out-of-pocket limit
  8. prescription costs across the full year
  9. pharmacy pricing
  10. travel or out-of-network exposure

The right question is not simply, “Which plan is cheapest?” The better question is, “What would this plan cost if I use care the way I realistically expect to use it?”

Be Careful With “Better Benefits”

Dental, vision, hearing, transportation, grocery, fitness, and over-the-counter benefits can be useful.

They should not be the only reason you pick a Medicare Advantage plan.

Before letting an extra benefit drive the decision, ask:

  1. Is the benefit available in my ZIP code?
  2. Which providers accept it?
  3. Is there a network?
  4. Is there an annual limit?
  5. Does the medical network still work?
  6. Do my prescriptions still price well?
  7. Is the maximum out-of-pocket limit acceptable?

The extras matter less if the plan creates problems with the doctors, hospitals, medications, or costs you actually depend on.

Know What Open Enrollment Does Not Fix

Medicare Open Enrollment is important, but it does not solve every Medicare problem.

For example:

  1. it is not your first Medicare enrollment window when you turn 65
  2. it does not erase a Part B late enrollment penalty
  3. it does not automatically give you a Medigap policy with no health questions
  4. it does not mean every plan is available in every county
  5. it does not make an out-of-network doctor in-network

That Medigap point is especially important. You may be able to leave Medicare Advantage during an allowed window, but buying a Medicare Supplement policy after your first Medigap Open Enrollment Period can involve underwriting unless you have a guaranteed issue right.

If that is your situation, read Can You Switch From Medicare Advantage to Medigap Later?.

A Practical Open Enrollment Checklist

Use this order before you make a 2027 plan decision:

  1. Open your Annual Notice of Change.
  2. Circle changes to premiums, deductibles, copays, networks, and drug coverage.
  3. Update your prescription list.
  4. Confirm every important doctor and hospital.
  5. Compare pharmacies, not just drug plans.
  6. Review estimated annual drug costs.
  7. Check the maximum out-of-pocket limit.
  8. Decide whether extra benefits are actually usable.
  9. Compare your current plan against alternatives.
  10. Keep a copy of the comparison and enrollment confirmation.

If you are still getting ready for Medicare for the first time, use the Medicare Readiness Checklist before focusing on annual plan changes.

What I Would Watch in the Kansas City Area

In the Kansas City area, plan fit can change by county, pharmacy, and provider system.

A plan that looks fine in Jackson County may not line up the same way in Clay County, Johnson County, Wyandotte County, or a rural county nearby. Pharmacy pricing can also differ across Blue Springs, Lee’s Summit, Independence, Overland Park, Liberty, and North Kansas City.

That is why I do not like plan decisions based on a neighbor’s recommendation. Their doctors, prescriptions, county, and pharmacy may not match yours.

The comparison needs to be personal, not just local.

The Practical Bottom Line

Medicare Open Enrollment is your annual chance to check whether your Medicare Advantage or Part D coverage still fits for the next year.

For 2027 coverage, start with your Annual Notice of Change, update your prescriptions, verify doctors and pharmacies, and compare total cost before you decide to stay or switch.

Staying with the same plan can be perfectly reasonable. Renewing without checking is where the risk comes in.

Frequently Asked Questions

When is Medicare Open Enrollment for 2027 coverage?

Medicare Open Enrollment runs from October 15 through December 7. Changes made during that window usually start January 1, 2027.

Do I need to change Medicare plans every year?

No. You should review your plan every year, but you do not automatically need to change. If your doctors, prescriptions, pharmacy, costs, and plan rules still fit, staying may be the right decision.

What should I check first during Medicare Open Enrollment?

Start with your Annual Notice of Change. Then check prescriptions, doctors, hospitals, pharmacies, premiums, deductibles, copays, and maximum out-of-pocket limits.

Can I switch from Medicare Advantage to Medigap during Open Enrollment?

You may be able to leave Medicare Advantage during Medicare Open Enrollment, but getting a Medigap policy is a separate issue. After your first Medigap Open Enrollment Period, underwriting may apply unless you have a guaranteed issue right.

Is Plan Compare enough to choose a Medicare plan?

Plan Compare is an important official tool, but the details you enter matter. Use your exact medications, pharmacy, doctors, and ZIP code before relying on a comparison.

Official Sources