When and How Should I Apply for Medicare in 2027?

Quick facts for applying in 2027

Medicare is federal health insurance primarily for people 65 or older and for certain younger people who qualify through disability, End-Stage Renal Disease, or ALS. Eligibility does not always begin on a 65th birthday, and the correct application route can differ for disability, kidney disease, railroad service, residence outside the United States, or premium-Part A situations.

Part A is Hospital Insurance. Part B is Medical Insurance. Together they form Original Medicare, though each part has separate coverage, cost, and enrollment rules. Medicare Advantage is another way to receive Part A and Part B benefits through a private Medicare-approved plan. Part D is private prescription drug coverage. Medigap supplements Original Medicare and is not part of Medicare Advantage.

Will Medicare enroll you automatically?

People already receiving Social Security retirement or disability benefits—or certain Railroad Retirement Board benefits—may be enrolled automatically when they become eligible. Medicare sends a welcome package and card explaining Part A and Part B effective dates. Read it immediately. Automatic enrollment does not remove the need to decide how to receive coverage or whether other insurance must be coordinated.

If you are turning 65 and are not receiving Social Security benefits, you generally must sign up. Delaying retirement checks does not require delaying Medicare. Social Security’s application allows eligible people to request Medicare without claiming monthly retirement benefits. A person who expects an automatic card simply because Social Security handles enrollment could miss the Initial Enrollment Period.

Automatic-enrollment rules have exceptions. For example, people living in Puerto Rico who receive benefits may get Part A automatically but need to enroll in Part B. People with ESRD use a distinct eligibility and enrollment route, and people who worked for a railroad should contact the Railroad Retirement Board. Confirm the correct pathway rather than applying based only on age.

Which Medicare enrollment period applies?

Initial Enrollment Period

The Initial Enrollment Period is the first opportunity for most age-based applicants. It lasts seven months, beginning three months before the month a person turns 65 and ending three months after the birthday month. If a birthday falls on the first day of a month, Medicare timing may be based on the previous month. Use Medicare’s official date tool or Social Security rather than counting by memory.

Applying during the three months before the birthday month generally allows coverage to begin with the first month of eligibility. If the application is submitted during the birthday month or one of the final three months, coverage generally begins the month after enrollment. The effective date on the official notice controls.

Special Enrollment Period for current-employment coverage

A person may be able to delay Part B without a penalty while covered under an employer group health plan based on current employment—either the person’s job or a spouse’s current job. After the employment or coverage ends, whichever happens first, an eight-month Part B Special Enrollment Period generally applies. Employer size and coordination-of-benefits rules affect whether Medicare should have been primary, so get written guidance from the employer plan.

COBRA and retiree coverage are not coverage based on current employment for this Part B Special Enrollment Period. Choosing COBRA does not reset or extend the eight-month clock. Marketplace coverage, VA benefits, and other arrangements also have different Medicare coordination rules. Prescription drug coverage has its own creditable-coverage test and deadlines.

General Enrollment Period

If the Initial Enrollment Period was missed and no Special Enrollment Period applies, the General Enrollment Period is January 1 through March 31 each year. Coverage generally begins the first day of the month after enrollment. A coverage gap and Part B late-enrollment penalty may apply. The penalty is generally 10% for each full 12-month period a person could have had Part B but did not enroll, and it is usually paid for as long as the person has Part B.

Exceptional-condition Special Enrollment Periods

Federal rules recognize Special Enrollment Periods for certain exceptional circumstances, such as misinformation by an employer or health plan, loss of Medicaid coverage, release from incarceration, or an emergency or disaster that prevented timely enrollment. Eligibility is fact-specific and requires the current application and evidence. Social Security, not an insurance agency, decides whether the exception applies.

How to apply for Medicare Part A and Part B

1. Identify why and when you qualify. Determine whether eligibility is age-based, disability-based, ESRD-related, ALS-related, or connected to another category. Confirm the desired coverage month.
2. Determine whether enrollment is automatic. If a welcome package is expected, monitor the mail and online account. If not, plan to submit an application.
3. Review other health coverage. Ask the employer, union, TRICARE, VA, retiree plan, Marketplace, or COBRA administrator how that coverage coordinates with Medicare.
4. Prepare the requested information. Gather Social Security details, date and place of birth, health coverage and employment dates, and evidence required for a Special Enrollment Period.
5. Apply with the correct agency. Use the official Social Security Medicare application, call Social Security, or follow Railroad Retirement Board instructions if applicable.
6. Save proof. Keep the confirmation number, copies of forms, fax or mailing records, employer verification, and notes from agency calls.
7. Check the card and notice. Confirm the name, Medicare number, selected parts, and effective dates. Report errors promptly.

Someone applying for Part B after already having Part A may use a different process. Social Security provides a Part B-only route. For a Special Enrollment Period based on employer coverage, Form CMS-40B and employment evidence such as Form CMS-L564 may be required depending on the submission method. Exceptional-condition applications can use Form CMS-10797. Always use current forms and instructions.

Working past 65, HSAs, and delayed enrollment

Working after 65 does not automatically make delaying Medicare safe. The key question is whether the health plan is based on the current employment of the beneficiary or spouse and how the plan coordinates with Medicare. An employer plan may pay second after Medicare once a worker reaches 65. If Medicare should have been primary and Part B was declined, the plan may not pay costs as expected.

Ask the benefits administrator how many employees the employer has, whether the group plan is primary or secondary, whether Medicare enrollment is required, and when the coverage ends. Keep the annual notice showing whether prescription coverage is creditable for Part D. “Good insurance” is not a federal enrollment category; the actual source and status of coverage matter.

Health Savings Accounts create an additional issue. A person cannot contribute to an HSA for any month enrolled in Medicare. When someone applies for premium-free Part A after age 65, Part A can begin retroactively for up to six months, but not before the first month of eligibility. Medicare advises people applying after 65 to stop HSA contributions at least six months before applying for Medicare or Social Security benefits. Consult a qualified tax professional for the exact stopping month and any correction.

Delaying Part B also delays the federal Medigap open enrollment window. That six-month period generally begins once a person is 65 or older and enrolled in Part B. Outside protected enrollment rights, Medigap underwriting may apply depending on federal and state rules. Medicare Advantage and Part D enrollment periods are different from Medigap rules, so one deadline should not be used for every coverage type.

What happens after Medicare approves the application?

Review the Medicare card and award notice before shopping for private coverage. The Part A and Part B dates determine which options and enrollment periods apply. If the information is wrong, contact Social Security or the Railroad Retirement Board. A private insurer cannot correct the federal record.

Next, decide between Original Medicare and Medicare Advantage. Original Medicare lets the federal program administer Part A and Part B claims. Beneficiaries often consider separate Part D drug coverage and may apply for Medigap. Medicare Advantage provides Part A and Part B benefits through a private Medicare-approved plan and often includes Part D, but plan networks, authorization rules, service areas, and costs must be reviewed.

Use actual 2027 plan documents when they are released. Verify doctors directly with both the provider and plan, enter prescriptions by exact name and dosage, and check preferred pharmacies. Do not infer a 2027 benefit from a 2026 brochure. Plan premiums, formularies, networks, cost sharing, and supplemental benefits can change.

Medicare application FAQs for 2027