Turning 65? Your 2026 Medicare Initial Enrollment Period Guide

Quick answer: what to do when you turn 65

1. You have a 7-month Initial Enrollment Period (IEP) — the 3 months before, your birthday month, and the 3 months after.

2. Sign up for Parts A & B at ssa.gov/medicare/sign-up — or you're auto-enrolled if you're already drawing Social Security.

3. Pick your path: Original Medicare + Medigap + Part D (widest network, predictable cost) or Medicare Advantage (lower premium, network restrictions).

4. If choosing Medigap, use your separate 6-month Medigap Open Enrollment — every plan is guaranteed-issue, no health questions. Miss this window and most states allow medical underwriting.

5. Enroll in Part D within 63 days of becoming Medicare-eligible (unless you have creditable coverage through an employer). The late-enrollment penalty is permanent.

Free help: call (256) 800-4885 or scroll down to request a quote from a licensed independent Medicare agent in your state.

Your 7-month Initial Enrollment Period (IEP)

Your IEP is 7 months long: the 3 months before the month you turn 65, your birthday month itself, and the 3 months after. If your birthday is March 15, your IEP runs December 1 through June 30.

Example: birthday on May 15

Feb3 mo before

Mar2 mo before

Apr1 mo before

Maybirthday month

Jun1 mo after

Jul2 mo after

Aug3 mo after

Enrolling in the 3 months BEFORE your birthday month gives you the earliest coverage start (the first day of your birthday month). Enrolling in your birthday month or after delays your coverage and shrinks the time you have to compare Medigap plans during the guaranteed-issue window.

Are you auto-enrolled? Maybe.

Auto-enrolled: If you are already receiving Social Security or Railroad Retirement Board benefits, you are automatically enrolled in Parts A and B effective the first day of your birthday month. Your red-white-and-blue Medicare card arrives about 3 months before your 65th birthday.

Manual enrollment required: If you are NOT yet drawing Social Security, you must actively enroll. Three options:

Online — fastest, ~10 minutes at ssa.gov/medicare/sign-up
By phone — call Social Security at 1-800-772-1213 (TTY 1-800-325-0778)
In person — your local Social Security office (appointments recommended)

Your 4 paths after age 65

After enrolling in Parts A and B, you choose one of four paths. The right choice depends on your doctors, prescriptions, travel patterns, and budget.

1. Original Medicare alone

Parts A + B only. You pay 20% coinsurance on most services with no annual out-of-pocket maximum. No prescription drug coverage.

Best for: very few people. The lack of an out-of-pocket cap is the deal-breaker.

2. Original Medicare + Medigap + Part D

Parts A + B + a private Medigap (Medicare Supplement) policy + a standalone Part D drug plan. Most predictable cost; widest provider network (any Medicare-accepting doctor nationwide). Higher monthly premium (~$130–$200/mo for Plan G).

Best for: people who want predictable costs, plan to travel, see specialists often, or have specific doctors they want to keep.

3. Medicare Advantage (Part C)

A private plan that replaces Original Medicare; usually bundles Part D. Lower or $0 monthly premium. Network restrictions (HMO/PPO) and copays for individual services. Plan-specific out-of-pocket maximum.

Best for: people whose doctors are in-network, who want lower monthly costs, and don't mind referrals/prior auth.

4. Special Needs Plan (SNP)

A type of Medicare Advantage for people with chronic conditions (C-SNP), dual Medicare/Medicaid eligibility (D-SNP), or who live in nursing homes (I-SNP). Tailored benefits and care management.

Best for: people who qualify by condition, dual-eligibility, or institutional status.

The most important window most people don't know about: Medigap Open Enrollment

Separate from Medicare's 7-month IEP, you have a one-time 6-month Medigap Open Enrollment Period that starts the month you turn 65 AND are enrolled in Part B.

During this 6-month window: every Medigap plan in your state is guaranteed-issue with no health questions. Carriers cannot decline you, charge more for pre-existing conditions, or impose a waiting period for benefits.

Outside this window: most states allow medical underwriting. The carrier can ask about your health history, decline you, charge a higher premium based on conditions, or refuse to sell you a Medigap plan at all.

This is why missing the Medigap OEP — and trying to buy Medigap later, after a health diagnosis — is the single most expensive Medicare mistake new beneficiaries make. A few states (CT, ME, MA, NY, VT) have year-round guaranteed-issue rules; ten states (CA, ID, IL, KY, LA, MD, MN, NV, OK, OR) have a "birthday rule" allowing one switch per year without underwriting; one state (MO) has an anniversary rule. Everywhere else, your one-time 6-month window is your only no-questions-asked shot.

Plan G vs Plan N — the choice for new Medigap enrollees

Plan F is closed to anyone who became Medicare-eligible after Jan 1, 2020. For new enrollees, the two main choices are Plan G and Plan N.

Plan G — covers everything Medicare doesn't, except the Part B annual deductible ($257 in 2026). Typical premium $130–$200/mo. Most popular plan for new enrollees.
Plan N — like Plan G but adds a $20 office copay, a $50 ER copay (waived if admitted), and doesn't cover Part B "excess charges" (a non-issue in most states). Typical premium $90–$160/mo.
High-Deductible Plan G (HD-G) — same coverage as Plan G after a federal $2,870 annual deductible (2026). Typical premium $40–$70/mo. Good for healthy enrollees who want catastrophic-only coverage.

Quick break-even math: Plan N typically saves ~$30/month vs Plan G but adds office copays. Break-even is roughly 13 non-preventive doctor visits per year. Below that, Plan N wins. Above that — or in a state that still allows Part B excess charges — Plan G wins.

All Medigap plans of the same letter are federally standardized. Coverage is identical across carriers — only price and rate-increase history differ. Carrier financial strength matters because Medigap premiums rise over time, and switching carriers later requires re-underwriting in most states. Try our Medigap savings calculator for your state, age, and expected utilization.

Part D — and the lifetime penalty for waiting

Part D is prescription drug coverage. It is optional in the sense that you can decline it — but the late-enrollment penalty is permanent and lasts the rest of your life.

If you go more than 63 days without "creditable" prescription coverage after first becoming Medicare-eligible, you owe a permanent monthly penalty added to your Part D premium for life. The penalty is approximately 1% of the national base beneficiary premium ($36.78 in 2026) per month delayed. A 12-month delay costs roughly $4.40/month extra, every month, forever. A 24-month delay doubles that.

Creditable coverage exemption: if you have prescription coverage through an employer, retiree plan, VA, or TRICARE that is at least as good as standard Part D, you can delay Part D enrollment without penalty until you lose that coverage. Get a written "creditable coverage" letter from your benefits administrator and keep it.

Common mistakes — and how to avoid them

Mistake #1: Missing the 6-month Medigap Open Enrollment. If you choose Original Medicare + Medigap, you have ONE 6-month window of guaranteed-issue. Miss it, develop a health condition, and most states allow carriers to decline you or charge more. This is the most expensive Medicare mistake.

Mistake #2: Delaying Part D enrollment. The penalty is permanent. If you don't have creditable employer/retiree coverage, enroll within 63 days of Medicare eligibility.

Mistake #3: Assuming you'll be auto-enrolled. Auto-enrollment only happens if you are already drawing Social Security. Everyone else must actively enroll during their IEP — no enrollment, no Medicare.

Mistake #4: Enrolling in your birthday month instead of 3 months earlier. Enrolling in the 3 months BEFORE your birthday month gives you coverage starting the first day of your birthday month. Enrolling in your birthday month or after delays coverage by 1–3 months.

Mistake #5: Picking Medicare Advantage without checking the network. Medicare Advantage plans use HMO/PPO networks. Confirm every doctor you want to keep and every hospital you'd want to use is in-network for the specific plan you're considering. Networks change yearly.

Mistake #6: Assuming Plan F is your best option. Plan F was a popular choice but is closed to anyone Medicare-eligible after Jan 1, 2020. Newly eligible beneficiaries should compare Plan G, Plan N, and HD Plan G instead.

Your turning-65 timeline — when to do what

6 months before your 65th birthday — start researching Medicare basics, Part A vs B, Original Medicare vs Medicare Advantage. Decide your path.
4 months before — if you're still working with employer coverage, talk to your benefits administrator about whether to delay Part B. If retiring at 65, start gathering Medigap or Medicare Advantage quotes.
3 months before — earliest you can enroll in Parts A and B. Enrolling now means coverage starts the first day of your birthday month.
Birthday month — your 6-month Medigap Open Enrollment begins (assuming you're enrolled in Part B). This is the guaranteed-issue window — lock in your Medigap plan now.
Within 63 days of Medicare eligibility — enroll in Part D (unless you have creditable employer/retiree coverage).
6 months after birthday month — your Medigap Open Enrollment ends. After this, most states allow medical underwriting.
Each fall (Oct 15 – Dec 7) — Medicare's Annual Enrollment Period (AEP). You can switch Medicare Advantage plans, Part D plans, or move between Medicare Advantage and Original Medicare. Medigap policies are NOT changed during AEP — they have their own rules.

Get free, personalized help

Independent Medicare agents quote every major carrier in your state at no cost to you. Your monthly premium is identical whether you enroll through an agent or directly with the carrier — but a good agent can save you hours of comparison and help you avoid mistakes that cost thousands later.

InsureClicks is a nationwide network of licensed independent agents specializing exclusively in Medicare Supplement (Medigap), Medicare Advantage, Part D, and Special Needs Plans. Call (256) 800-4885 or scroll down to request a quote.

Turning-65 Medicare FAQ

When does my Medicare enrollment window open if I'm turning 65? +

Your Initial Enrollment Period (IEP) is 7 months long: the 3 months before the month you turn 65, your birthday month itself, and the 3 months after. If your birthday is March 15, your IEP runs December 1 through June 30. Enrolling in the 3 months BEFORE your birthday month gives you the earliest coverage start (the first of your birthday month).

Do I get Medicare automatically when I turn 65? +

Only if you are already receiving Social Security or Railroad Retirement benefits. In that case, you're automatically enrolled in Parts A and B effective the first day of your birthday month, and your Medicare card arrives about 3 months before your 65th birthday. If you are NOT yet drawing Social Security, you must actively enroll at ssa.gov, by phone (1-800-772-1213), or in person at a Social Security office during your IEP.

What is the 6-month Medigap Open Enrollment and why does it matter? +

Separate from Medicare's 7-month IEP, you also have a one-time 6-month Medigap Open Enrollment Period that starts the month you turn 65 AND are enrolled in Part B. During this window, every Medigap plan is guaranteed-issue — carriers cannot ask health questions, decline you, or charge more for pre-existing conditions. Outside this window, most states allow medical underwriting. Missing the Medigap OEP and trying to buy a Medigap later (after a health diagnosis) is the single most expensive mistake new beneficiaries make.

Should I pick Original Medicare + Medigap, or Medicare Advantage? +

Original Medicare + Medigap + Part D offers the widest provider network (any Medicare-accepting doctor nationwide), the most predictable monthly costs, and no need for plan-by-plan referrals. Higher monthly premium. Medicare Advantage typically has a lower or $0 premium, but uses network restrictions (HMO/PPO) and copays for individual services. The right choice depends on your doctors, prescriptions, travel patterns, and budget — a licensed independent agent can model both side-by-side for your specific situation.

What happens if I delay Part D enrollment? +

If you go more than 63 days without "creditable" prescription coverage after first becoming Medicare-eligible, you owe a permanent monthly penalty added to your Part D premium for life. The penalty is approximately 1% of the national base beneficiary premium ($36.78 in 2026) times the number of months you went without coverage. A 12-month delay costs roughly $4.40/month extra, every month, forever. If you have creditable coverage through an employer or VA, you can delay Part D without penalty until you lose that coverage.

When should I start planning my Medicare enrollment? +

Start researching 6 months before your 65th birthday. By 4 months out, narrow your Medicare path (Original + Medigap vs Medicare Advantage). By 3 months out, you can begin enrolling — and the earliest enrollment month gives you coverage starting the first day of your birthday month. Waiting until your birthday month or after delays your coverage start date and shrinks the time you have to compare Medigap plans during the guaranteed-issue window.

I'm still working at 65 with employer health coverage. Do I still need Medicare? +

If your employer has 20+ employees, your group coverage typically remains primary and you can delay Part B (and Part D, if your employer coverage is creditable) without penalty. You should still enroll in Part A (it's premium-free for most people). If your employer has fewer than 20 employees, Medicare becomes primary and you generally need to enroll in Part B during your IEP. Confirm your specific situation with your benefits administrator — getting this wrong creates expensive coverage gaps.

Turning 65? Here's Your 7-Month Medicare Enrollment Window