A few notes before the article:
If you found us through Oldster last week, welcome! Oldster is a Substack that focuses on the good, the bad, and the ugly we experience with each milestone, starting early in life. It’s about the experience of getting older, and what that means at different junctures.
In an effort to provide as much detail as possible on an extremely important topic, this article is about 3 times as long as normal. We have a podcast version of it if you’d like to listen to that first.
Your Medicare coverage seems fine. Then the advertisements arrive, promising lower premiums, dental benefits, and money back. You wonder whether you’re missing something.
But another question deserves equal attention: What might you give up by switching?
That matters especially if you later develop cancer, suffer a stroke, or need complicated treatment. Coverage that works for occasional appointments may feel different when you need several specialists, rehabilitation, or care outside your area.
You can sort through the offers without starting over. First, identify what you already have. Then compare your doctors, prescriptions, total expenses, and ability to change coverage later.
For this enrollment season, October 15 through December 7, 2026, you’re generally choosing coverage that begins January 1, 2027.
You don’t have to switch. You do need to review.
What do Medicare’s different letters mean?
Medicare uses letters for two separate naming systems. Parts A, B, C, and D describe Medicare coverage. Medigap letters describe supplemental insurance policies.
They aren’t interchangeable.
Part A helps cover inpatient hospital care, qualifying skilled nursing facility care, hospice, and some home health care.
Part B helps cover doctors, outpatient care, medical equipment, preventive services, and certain drugs administered in medical settings.
Part C means Medicare Advantage. A private insurer provides your Part A and Part B benefits, usually with prescription coverage.
Part D provides prescription drug insurance. You can buy it separately with Original Medicare, and most Medicare Advantage plans include it.
Medigap helps pay certain expenses left to you under Original Medicare. It doesn’t supplement Medicare Advantage.
Your main choice usually falls between two arrangements:
Original Medicare, often combined with Medigap and a separate Part D plan.
Medicare Advantage, usually combining medical and prescription benefits through one insurer.
Medicare Advantage isn’t additional insurance layered over Original Medicare. It’s another way to receive your Medicare benefits.
Before comparing anything, put your insurance cards on the table. Identify your medical coverage, prescription coverage, and any supplement.
The insurer’s name alone won’t tell you what you have. One company may sell all three kinds of coverage.
Where can you find your coverage?
Start with your personal Medicare account. It can show a summary of your current Medicare coverage and help you use saved prescriptions and pharmacies when comparing plans.
If you haven’t created an account, begin there rather than through an advertisement. Follow the site’s current identity-verification instructions.
Use your own email address. Medicare says each account needs a unique address, not one shared with someone else.
Your Medicare account is the starting point, not necessarily the complete record of every supplemental or employer benefit.
For a fuller picture, check:
Your Medicare account for your Medicare coverage summary.
Your insurer’s member website for policy details, identification cards, claims, and plan documents.
Your Medigap insurer’s website or customer service department for your policy letter, premium, and effective date.
Your employer or retiree benefits website for coverage that coordinates with Medicare.
Have you ever found an insurance card and wondered whether it was still current? Confirm the plan’s status online or by calling the number on the card.
Write a one-page inventory: plan names, Medigap letter if applicable, monthly premiums, member-service numbers, and coverage dates.
If the websites disagree or something is missing, call 1-800-MEDICARE at 1-800-633-4227 and the insurer. Resolve that before shopping.
Which enrollment rules apply to you?
Fall open enrollment lets you change Medicare Advantage or Part D coverage, or move between Medicare Advantage and Original Medicare.
It doesn’t automatically give you the right to buy Medigap without health questions.
These enrollment periods have different purposes:
October 15–December 7: Annual Medicare open enrollment. Changes generally begin January 1.
January 1–March 31: Medicare Advantage open enrollment. If you already have Advantage, you can generally make one change to another Advantage plan or return to Original Medicare and obtain Part D coverage.
Initial Medicare enrollment: Your opportunity to first sign up for Medicare.
Special enrollment periods: Certain events, such as moving or losing qualifying coverage, may permit changes outside ordinary enrollment windows.
Medigap open enrollment: Your federal six-month period begins the first day of the first month you’re 65 or older and have Medicare Part B. It doesn’t restart each autumn. State law may provide additional opportunities.
Have you assumed everything becomes available again each autumn? That misunderstanding can leave you without the supplement you expected.
Before applying, identify the enrollment opportunity for each change. Leaving Advantage, joining Part D, and buying Medigap involve related but separate rules.
Don’t confuse an annual opportunity to change medical plans with a guaranteed opportunity to obtain supplemental insurance.
Why might Advantage become less suitable?
This is a potential problem with Medicare Advantage: its provider networks, approval requirements, and cost-sharing can become more consequential when you develop serious health problems.
An Advantage plan may meet your needs. The question is whether its providers, costs, and coverage rules suit your situation. Routine appointments don’t reveal everything you may need to check for complicated treatment.
Consider these situations:
You develop cancer and want a specialist outside the network.
You suffer a stroke and prefer a particular rehabilitation facility.
You need several specialists, repeated imaging, and ongoing treatment.
You want care near an adult child in another state.
Your preferred doctor or hospital leaves the network.
A health maintenance organization, or HMO, generally requires network providers for routine care. Exceptions include emergency care, out-of-area urgent care, and temporary out-of-area dialysis.
Some HMO Point-of-Service plans allow certain out-of-network services at higher cost. Ask which rules apply before assuming your preferred facility is unavailable.
A preferred provider organization, or PPO, generally allows out-of-network care, often at higher cost. Confirm that the provider will treat you under that plan.
Prior authorization means the insurer requires approval before covering certain services. A request may require additional documentation, face a denial, or lead to an appeal.
That can mean extra calls and paperwork while you’re worried or recovering.
Ask each candidate plan how your preferred specialists, hospitals, and rehabilitation providers fit its rules. Don’t settle for a general assurance that it “covers cancer” or “covers rehabilitation.”
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Why could illness make switching difficult?
Imagine you’ve had Medicare Advantage for several years. Your premium is manageable, and ordinary appointments have gone smoothly.
Then you receive a cancer diagnosis.
You want a second opinion at a particular cancer center, but it isn’t in your network. Or authorization requirements make arranging treatment more frustrating than you expected.
You consider Original Medicare because it generally lets you use doctors and hospitals nationwide that accept Medicare, without a private plan’s provider network.
Original Medicare also generally involves fewer prior authorization requirements, though some services do require approval.
But Original Medicare leaves expenses for you to pay. For many Part B services, that generally includes 20% coinsurance after the deductible. It has no annual out-of-pocket maximum.
You therefore want Medigap alongside it.
Outside a protected enrollment opportunity, a Medigap insurer may review your health. This is medical underwriting. Depending on your state and circumstances, the insurer may decline your application or charge more.
Illness can make broader provider access more valuable at the same time it makes Medigap harder to obtain.
This isn’t Advantage refusing to insure you because you became sick. It’s the interaction between Advantage’s coverage arrangements and separate Medigap purchasing rules.
⚠️ CRITICAL WARNING: Leaving Medicare Advantage for Original Medicare does not automatically guarantee you can buy Medigap without medical underwriting.
In most states, outside a protected enrollment opportunity, insurers can review your medical history and decline your application because of health problems. Verify your federal and state protections before leaving your plan.
Can you always get Medigap back?
No. Returning to Original Medicare and obtaining Medigap are separate decisions.
Federal law provides certain guaranteed issue protections and trial rights. State law may provide additional protections.
When you have a guaranteed issue right, an insurer must:
Sell you a Medigap policy covered by that right.
Cover your pre-existing health conditions without a waiting period.
Not charge more because of past or present health problems.
These protections don’t necessarily let you buy every plan letter. Your qualifying situation determines which policies you can obtain.
Two federal trial-right situations deserve attention:
You dropped Medigap to join Medicare Advantage for the first time and want to return within the first 12 months. You may have the right to recover your former policy if available, or obtain certain alternatives.
You joined Medicare Advantage when first eligible for Medicare Part A at 65 and return to Original Medicare within the first year. A Medigap purchase right may apply.
Other protections may apply if your Advantage plan ends coverage in your area or you move outside its service area.
The qualifying event, deadline, available policies, and documentation all matter. Many federal protections require applying no later than 63 days after the relevant coverage ends. Verify your specific deadline before leaving anything.
A serious diagnosis by itself generally doesn’t create a federal guaranteed right to buy Medigap.
Ask these questions separately:
Can I return to Original Medicare?
Can I buy Medigap without medical underwriting, meaning a review of my health?
Which policies can I buy?
What deadline and protection apply?
Have your State Health Insurance Assistance Program, known as SHIP, or state insurance department verify the answers.
What does each Medigap plan cover?
In most states, standardized Medigap policies use letter names. Massachusetts, Minnesota, and Wisconsin use different standardization systems.
The same standardized letter provides the same basic benefits across insurers. Premiums, service, and pricing practices can differ.
Ask whether a quoted supplement is a Medicare SELECT policy. It may require particular hospitals, and sometimes doctors, for full supplemental benefits.
What would Plan G cover for you?
Plan G covers these expenses for Medicare-covered care:
Part A hospital coinsurance and up to 365 additional hospital days after Medicare benefits end.
Part B coinsurance or copayments.
The first three pints of blood and hospice coinsurance or copayments.
The Part A deductible and skilled nursing facility coinsurance.
Part B excess charges, where permitted, and limited foreign-travel emergency benefits.
Excess charges are amounts certain providers may charge above Medicare’s approved amount.
You pay the Part B deductible yourself. Plan G doesn’t pay for everything Medicare excludes, including ongoing custodial nursing-home care.
Would you rather pay a higher monthly premium for fewer remaining bills? Compare actual quotes before deciding whether that trade suits your budget.
What would you pay with Plan N?
Plan N covers the same main hospital, skilled nursing facility, blood, and hospice expenses as Plan G. It also includes limited foreign-travel emergency benefits.
You pay the Part B deductible, plus up to $20 for certain office visits. Emergency-room visits can bring a copayment of up to $50 unless you’re admitted as an inpatient.
Plan N doesn’t cover Part B excess charges. Ask whether your providers accept Medicare’s approved amount as full payment.
If Plan N’s premium is lower, compare the annual savings with likely copayments and possible excess charges. A lower premium helps only if the remaining expenses fit your budget.
How do high-deductible policies change things?
High-deductible versions of Plans F and G are available in some states. Plan F’s eligibility restrictions still apply.
You pay Medicare-covered deductibles, coinsurance, and copayments until reaching the policy’s annual high deductible. The policy then begins paying according to its terms. With high-deductible Plan G, the Part B deductible counts toward that threshold but remains your responsibility.
These policies may suit you if the lower premium leaves enough savings to handle a difficult year. Check the deductible for your coverage year, then compare annual premiums plus possible expenses.
What about the other Medigap letters?
Legacy plans C and F: If you were eligible for Medicare before January 1, 2020, you may still buy either plan, subject to purchasing rules, or keep an existing policy. Plan F offers the broadest standardized benefits. If its extra annual premium over Plan G exceeds that year’s Part B deductible, Plan G may cost less overall. Confirm acceptance before switching.
Other standardized plans A, B, D, K, L, and M: Benefits vary. Some omit or partly cover the Part A deductible. Plans K and L pay 50% or 75% of specified benefits, while fully covering the standard hospital coinsurance benefit. After their annual spending limit and the Part B deductible, they pay 100% of covered services for that year. Compare local quotes and remaining costs closely.
Medigap policies sold after 2005 don’t include prescription drug coverage. Medigap Plan D is not Medicare Part D.
Foreign-travel emergency benefits generally pay 80% of eligible charges after a $250 annual deductible, with a $50,000 lifetime limit. The emergency care must begin during your trip’s first 60 days. This isn’t comprehensive travel health insurance.
Use Medicare’s Medigap policy finder to check available insurers. Then obtain quotes and verify your purchasing rights.
How should your existing coverage guide you?
Your starting point determines what needs protecting.
If you have Original Medicare and Medigap, review Part D annually. A prescription-price problem doesn’t require replacing your medical coverage.
If you already have Medigap, getting sick generally doesn’t mean losing it. Policies issued since 1992 are guaranteed renewable despite health problems, provided you stay enrolled and pay the premium. That doesn’t freeze your premium.
Before replacing Medigap: Don’t cancel your existing policy until you confirm acceptance and effective dates for its replacement.
A replacement policy has a 30-day free-look period. You’ll generally pay both premiums during the overlapping month.
If you have Medicare Advantage, examine next year’s network, drug coverage, copayments, authorization rules, and medical spending maximum.
Another Advantage plan may solve your problem. Returning to Original Medicare isn’t the only option.
If you have Original Medicare without Medigap, review your exposure to medical expenses. Compare supplements you can actually obtain with available Advantage plans.
If you have employer, union, or retiree coverage, contact the benefits administrator before enrolling elsewhere. A change could affect your coverage or family benefits, and you might not get them back.
Also obtain individualized guidance for Medicaid, TRICARE military health coverage, or other coordinated benefits.
Write down what you want to improve and what you refuse to lose. That keeps an attractive advertisement from changing the question halfway through your comparison.
Which other plan types need checking?
Special Needs Plans, or SNPs, serve qualifying groups with specific chronic conditions, institutional care needs, or both Medicare and Medicaid. They’re HMO or PPO plans, not a separate network structure, and all include Part D coverage.
Other options include Private Fee-for-Service and Medical Savings Account plans, plus separate programs such as Cost Plans and PACE; availability and rules differ, so consult a local SHIP counselor before considering one.
Most Advantage HMO and PPO members cannot simply add a separate Part D plan. Doing so can disrupt their Advantage enrollment.
For any candidate, verify your primary doctor, specialists, hospital, rehabilitation providers, and medical equipment suppliers.
Ask the billing office: “Will you participate in this exact plan next year?”
“We take Medicare” isn’t a complete answer for Medicare Advantage.
If you spend part of the year elsewhere, check routine care there too. Emergency coverage doesn’t necessarily solve your need for ordinary appointments away from home.
How can you personalize prescription comparisons?
Sign in to your Medicare account through Medicare’s Plan Finder, select the upcoming coverage year, and enter your ZIP code.
Compare stand-alone Part D plans for Original Medicare, or Advantage plans with drug coverage when appropriate. Then follow three steps:
Enter every medication’s exact name, strength, quantity, and frequency from your bottles.
Select your usual pharmacy plus one or two nearby alternatives you’d actually use.
Compare estimated annual drug costs plus premiums, not just the monthly premium.
You can compare without signing in. Using your account lets you use saved drug and pharmacy information, but check that it’s current.
Have you ever selected the right medication name but the wrong strength? Check each entry against the bottle.
Include occasional expensive prescriptions, inhalers, injections, and medicines taken only during flare-ups.
The cheapest premium isn’t necessarily the cheapest plan. A different formulary or pharmacy arrangement can outweigh the premium difference.
Treat the results as estimates based on your entries and the plan information available, not a guarantee of next year’s bills.
What prescription details deserve another look?
Open each promising plan’s details. Check more than the annual total.
Look for:
Formulary status: Whether the plan covers each drug.
Drug tier: The pricing category that affects your share.
Prior authorization: Whether approval is required.
Step therapy: Whether you must try another medication first.
Quantity limits: Restrictions on how much the plan covers.
Pharmacy status: Whether your pharmacy is preferred, standard, or outside the network.
Compare retail and mail-order options if you would realistically use both. Don’t choose an inconvenient pharmacy just because it improves the estimate slightly.
Ask about expensive drugs directly with the plan. Confirm whether a medication belongs under Part B or Part D when that distinction is unclear.
For 2027, covered Part D drugs have a $2,400 annual out-of-pocket limit. Premiums don’t count toward it, and Part B drugs follow different rules.
The Medicare Prescription Payment Plan spreads covered out-of-pocket drug expenses across the calendar year. It doesn’t reduce the total.
After your initial enrollment period ends, going 63 consecutive days without Part D or other creditable drug coverage may trigger a penalty. Creditable means the coverage is expected to pay, on average, at least as much as standard Medicare drug coverage.
You generally pay that penalty for as long as you have Medicare drug coverage. You don’t pay it while receiving Extra Help.
Ask about Extra Help if prescription expenses strain your budget. Keep any notice confirming that your existing drug coverage is creditable.
How do you compare real medical costs?
A $0 plan premium doesn’t mean free care. You generally still pay your Part B premium, plus applicable deductibles, copayments, and coinsurance.
Compare two possible years:
An ordinary year, using your current appointments and prescriptions.
A difficult year, involving hospitalization, specialist treatment, rehabilitation, or frequent outpatient care.
Add premiums, deductibles, copayments, coinsurance, and likely uncovered expenses.
For Advantage, examine the medical out-of-pocket maximum and any separate network limits. Part D drug expenses have separate protections.
For Original Medicare with Medigap, add the supplement and prescription premiums, then identify what remains unpaid.
Don’t treat any spending limit as protection against every expense. Premiums and noncovered services generally remain outside those limits.
Extra dental, vision, hearing, grocery, or transportation benefits may have eligibility rules, approved providers, and dollar caps.
Would the plan still suit you without those extras?
Medicare generally doesn’t cover ongoing custodial long-term care, such as continuing help with bathing and dressing. Rehabilitation benefits aren’t broad nursing-home insurance.
Write down the difficult-year exposure. Compare it with what your household could actually afford, not what you hope you won’t need.
Who can help verify your choices?
Read your current plan’s Annual Notice of Change, which explains changes in costs and benefits. Use its Evidence of Coverage for detailed rules.
Then compare two or three realistic alternatives, rather than exhausting yourself with every available plan.
SHIP offers free, individualized Medicare counseling and doesn’t sell insurance. Find your state program through SHIP’s official website or ask Medicare for assistance.
Ask about Medicare Savings Programs and Extra Help if expenses are difficult.
A licensed agent can also help. But “independent” doesn’t necessarily mean the agent represents every insurer or plan.
Ask:
Which plans can you sell?
Which local options can’t you sell?
How are you paid?
What would I lose by leaving my current coverage?
What Medigap rights would I have later?
Request written plan information. Verify important answers independently.
Artificial intelligence, often called AI, can explain terminology and organize questions. Don’t rely on it to establish enrollment rights or guarantee provider participation.
And don’t upload your Medicare number, Social Security number, or unredacted medical documents merely to obtain a comparison.
How do you avoid enrollment scams?
Your phone rings. Someone says your Medicare benefits need verification today. They know your name, and you’re worried about losing coverage.
Knowing your name doesn’t prove they represent Medicare.
Medicare doesn’t call to sell you a plan. Private plan representatives also face restrictions on unsolicited marketing.
Be suspicious if someone:
Claims you must switch plans to keep Medicare.
Requests your Medicare number during an unexpected sales call.
Promises benefits without checking eligibility and location.
Pressures you to enroll immediately.
Requests banking information merely to provide a quote.
Refuses to name the exact plan.
Presents a sales appointment as an official Medicare requirement.
Caller identification, commonly called caller ID, isn’t reliable proof of identity.
Hang up and contact Medicare or your insurer using an independently obtained number.
Avoid unexpected enrollment links and attachments. Microsoft’s explanation of phishing describes how convincing messages persuade you to surrender personal information.
Some advertised benefits are genuine. The misleading part may concern who qualifies or what you must surrender.
If someone enrolls you without permission, contact Medicare immediately. Request help correcting it, and preserve messages, paperwork, and names.
What should happen before you enroll?
Before submitting an application, confirm both the new benefits and the consequences of leaving your current coverage.
Check:
Essential doctors and facilities.
Prescriptions and pharmacy costs.
Referral and authorization requirements.
Ordinary-year and difficult-year expenses.
Medigap eligibility, if relevant.
Effects on other insurance.
Effective dates and cancellation procedures.
For ordinary Advantage or Part D switches, joining the replacement plan generally coordinates termination of the previous plan. Don’t cancel separately without confirming the correct process.
Medigap requires separate coordination. Enrolling in another type of coverage doesn’t necessarily handle your supplement.
Save the application confirmation, comparison results, plan documents, and relevant correspondence.
If you keep your current plan, confirm it will continue next year and that you understand its changes.
If you feel worn out by the paperwork, stop and ask for help. Keeping coverage that still suits you is a reasonable decision. You don’t owe an advertisement a change.
