Cómo solicitar Medicare

What Is Medicare and Who Can Apply?

Medicare is the federal health insurance program primarily designed for people age 65 or older. Certain younger people may also qualify because of a disability, amyotrophic lateral sclerosis, or end-stage renal disease requiring dialysis or a kidney transplant. Some people are enrolled automatically, while others must submit an application.

Eligibility and premium-free coverage are not exactly the same thing. Many people receive Medicare Part A without a monthly premium because they or a spouse paid Medicare taxes long enough. Someone without enough qualifying work history may still be able to purchase Part A and enroll in Part B if the applicable citizenship or lawful-residency requirements are met. A lawfully admitted noncitizen generally must have lived continuously in the United States for at least five years to buy Medicare at age 65.

The four main parts of Medicare

Before applying, it helps to understand Medicare’s alphabet collection:

• Part A covers inpatient hospital care, limited skilled nursing facility care, hospice care, and certain home health services.
• Part B covers physician services, outpatient care, preventive services, medical equipment, and other medically necessary services.
• Part C, commonly called Medicare Advantage, is an alternative offered by Medicare-approved private insurers. These plans combine Part A and Part B and usually include Part D.
• Part D is prescription drug coverage offered through private plans approved by Medicare.

Original Medicare consists of Part A and Part B. People who select Original Medicare may add a standalone Part D plan and may be able to purchase a Medicare Supplement Insurance policy, commonly called Medigap.

Will You Be Enrolled in Medicare Automatically?

You may be automatically enrolled in Part A and Part B if you are already receiving Social Security retirement benefits before turning 65. In that situation, your Medicare card is normally mailed before your coverage begins. People receiving certain Railroad Retirement Board benefits may also be enrolled automatically through the RRB rather than Social Security.

If you are not receiving Social Security or Railroad Retirement benefits when you approach 65, Medicare enrollment generally is not automatic. You must apply even if you plan to continue working and delay claiming retirement benefits. Medicare eligibility begins at 65; it does not wait for your full Social Security retirement age to arrive with balloons and a cake.

Review every Medicare card or enrollment notice you receive. Part B has a monthly premium, so someone who is automatically enrolled but wants to delay Part B because of qualifying employer coverage must follow the instructions for declining it. Do not simply place the card in a drawer and hope the government interprets that as a carefully considered insurance decision.

When Should You Apply for Medicare?

Your Initial Enrollment Period

For most people who qualify at age 65, the Initial Enrollment Period lasts seven months. It begins three months before the month of your 65th birthday, includes your birthday month, and ends three months afterward. Enrolling during the three months before your birthday month generally provides the smoothest transition and reduces the risk of a coverage gap.

For example, if your 65th birthday is September 18, your Initial Enrollment Period normally runs from June 1 through December 31. Applying in June, July, or August gives Social Security time to process the application before September.

The General Enrollment Period

If you missed your Initial Enrollment Period and do not qualify for a Special Enrollment Period, you can generally enroll in Part A and Part B during the General Enrollment Period from January 1 through March 31. Coverage normally begins the first day of the month after enrollment. Late-enrollment penalties may apply.

Special Enrollment Periods

You may be able to delay Part B without a penalty when you or your spouse are actively working and you have coverage from that current employment. After the employment or qualifying group health coverage ends, an eight-month Special Enrollment Period is generally available for Part B. The eight-month clock may begin when employment ends, even if COBRA coverage continues afterward.

Special Enrollment Periods may also be available after certain exceptional circumstances, including some emergencies, natural disasters, incarceration-related situations, or errors involving an employer or health plan. Because the details are situation-specific, confirm eligibility with Social Security or a State Health Insurance Assistance Program counselor before assuming that an exception applies.

How to Apply for Medicare Step by Step

Step 1: Determine whether you need to apply

Check whether you are already receiving Social Security or Railroad Retirement benefits. If automatic enrollment applies, review your enrollment notice and confirm your effective dates. Otherwise, plan to submit an application approximately three months before you want Medicare to begin.

Step 2: Decide whether to enroll in Part A, Part B, or both

Many applicants enroll in both Part A and Part B. However, someone with qualifying active-employment coverage may decide to enroll in premium-free Part A while delaying Part B. That decision requires special care if the person contributes to a Health Savings Account.

Before delaying Part B, ask the employer’s benefits administratorin writingwhether the current plan is considered employer group health coverage based on active employment and whether Medicare would pay first or second. Retiree insurance, COBRA, VA health benefits, and Marketplace insurance do not necessarily protect you from Part B late-enrollment penalties in the same way that qualifying active-employment coverage can.

Step 3: Apply through the correct agency

You enroll in Part A and Part B through the Social Security Administration, not through a private insurance company. The online Social Security application is usually the fastest option. You may apply for Medicare without applying for monthly Social Security retirement payments. Applicants can also contact Social Security by telephone or work with a local office. Railroad retirement beneficiaries should generally work with the Railroad Retirement Board.

Step 4: Gather useful information

The application may ask for personal and employment information. Prepare the following before beginning:

• Your Social Security number and date of birth
• Your current address and contact information
• Your place of birth and citizenship or lawful-residency information, when applicable
• Dates of current or recent employment
• Details about employer or union health insurance
• Your spouse’s employment and insurance information when coverage is through a spouse
• The date you want Medicare coverage to begin, when a choice is available

Social Security may already have the records needed to verify your identity, age, and work history. If additional evidence is required, it will tell you which documents are acceptable rather than asking you to arrive with every document you have owned since kindergarten.

Step 5: Submit the application and save proof

After submitting an online application, save the confirmation number or receipt. Write down the submission date and keep copies of any uploaded, faxed, or mailed forms. A personal Social Security account can be used to check application status, review the coverage start date, and obtain proof of Medicare coverage.

Step 6: Review your Medicare card

When your card arrives, verify your name and the effective dates for Part A and Part B. Contact Social Security promptly if anything appears incorrect. Do not email or post a photograph of the card because the Medicare number should be protected like other sensitive identification information.

How to Apply for Part B After Delaying It

If you already have Part A and need to add Part B after employer coverage ends, you may be able to complete the Part B application online. People using the employer-coverage Special Enrollment Period may need an Application for Enrollment in Medicare Part B, Form CMS-40B, and proof of qualifying employment coverage, commonly documented with Form CMS-L564.

The employer normally completes its section of the employment-information form. If the employer cannot provide the documentation, Social Security may accept certain alternative evidence, such as insurance cards, pay statements showing health deductions, tax forms, or benefit statements. Ask Social Security what evidence is acceptable in your particular case.

Submit the forms before employer coverage ends whenever possible. Waiting until the final day can create a coverage gap if a signature is missing, a fax fails, or the benefits department decides that Tuesday is an excellent day to ignore its inbox.

What Happens After Part A and Part B Enrollment?

Applying for Part A and Part B is only the first stage. You must also decide how you want to receive Medicare coverage.

Option 1: Original Medicare

Original Medicare allows you to use any physician or hospital in the United States that accepts Medicare. You may add a standalone Part D prescription drug plan. Because Original Medicare does not have a general annual limit on out-of-pocket costs, many beneficiaries also consider Medigap coverage.

Your federal Medigap Open Enrollment Period generally lasts six months, beginning with the first month in which you are both age 65 or older and enrolled in Part B. During this period, insurers generally cannot use medical underwriting to deny a standardized Medigap policy or charge more because of health conditions. State protections may provide additional opportunities.

Option 2: Medicare Advantage

Medicare Advantage plans are offered by private companies approved by Medicare. Plans must cover Part A and Part B services and usually include prescription drug coverage. They may offer extra benefits, but provider networks, prior-authorization rules, drug formularies, copayments, and service areas vary.

Compare plans based on your doctors, hospitals, prescriptions, pharmacies, expected medical use, travel habits, and total annual costsnot merely the monthly premium or the most enthusiastic television commercial.

Choosing prescription drug coverage

Part D is optional, but delaying enrollment without other creditable prescription coverage can produce a late penalty. The penalty is generally calculated using 1% of the national base beneficiary premium for every full month you lacked creditable drug coverage after becoming eligible.

Your Initial Enrollment Period for a Medicare Advantage or drug plan generally corresponds with your first eligibility for Medicare. After enrollment, the annual Medicare Open Enrollment Period runs from October 15 through December 7, with changes normally taking effect January 1. This annual period is mainly for changing health or drug plans; it should not be confused with the Initial Enrollment Period for Part A and Part B.

Important Situations to Handle Carefully

Working beyond age 65

Do not assume that all employer insurance lets you postpone Medicare safely. How Medicare coordinates with an employer plan can depend on the employer’s size, the reason for Medicare eligibility, and whether the coverage is based on current employment. Ask the benefits administrator which plan pays first and request a written answer.

COBRA coverage

COBRA generally does not extend the Part B Special Enrollment Period based on active employment. The eight-month enrollment window may begin when employment ends, not when COBRA expires. Someone who waits until the end of an 18-month COBRA period could face a Medicare coverage gap and a late penalty.

Health Savings Account contributions

You cannot contribute to an HSA for months in which you are enrolled in Medicare. Part A may be retroactive for up to six months when someone applies after age 65, although it will not begin before the month of Medicare eligibility. This retroactivity can turn recent HSA deposits into excess contributions. People planning to enroll after 65 commonly stop HSA contributions at least six months before applying and confirm the timing with a tax professional or benefits adviser.

Marketplace insurance

Marketplace coverage does not automatically terminate when Medicare begins. Update the Marketplace application and end coverage for the person transitioning to Medicare while preserving coverage for other household members who still need it. Once someone qualifies for premium-free Part A, the person generally cannot continue receiving Marketplace premium tax credits for their own coverage.

Veterans’ health benefits

VA health benefits and Medicare are separate systems. Many veterans enroll in Part A and Part B to obtain access to non-VA providers and reduce the risk of future Part B penalties. Before making a decision, discuss coordination rules with the VA and Social Security rather than assuming one program automatically replaces the other.

Medicare Costs and Late-Enrollment Penalties

Part B requires a monthly premium. In 2026, the standard Part B premium is $202.90 per month, and the annual Part B deductible is $283. Higher-income beneficiaries may pay an income-related surcharge. These figures are updated annually, so applicants enrolling in a later year should check the current amounts.

The Part B late-enrollment penalty generally increases the monthly premium by 10% for each full 12-month period in which the person could have enrolled but did not. In many cases, the penalty continues for as long as the beneficiary has Part B. A valid Special Enrollment Period can prevent the penalty.

Part A and Part D can also have late penalties in certain circumstances. That is why “I am healthy and take no prescriptions” is not a complete enrollment strategy. Insurance decisions are based partly on future risk, and future risk rarely sends a calendar invitation.

Getting Help With Medicare Costs

People with limited income and resources should investigate Medicare Savings Programs administered by state Medicaid agencies. Depending on the program, assistance may help pay Part B premiums, deductibles, coinsurance, or other Medicare expenses. Eligibility rules and financial limits can vary by state.

The Extra Help program assists eligible beneficiaries with Part D premiums, deductibles, and prescription costs. Some people qualify automatically through Medicaid, Supplemental Security Income, or a Medicare Savings Program; others must apply through Social Security.

Free, personalized counseling is available through the State Health Insurance Assistance Program. SHIP counselors provide unbiased help with enrollment periods, plan comparisons, billing problems, financial-assistance programs, and suspected Medicare fraud. They do not sell insurance.

Common Medicare Application Mistakes

• Assuming enrollment is always automatic: It may not be automatic when you are not receiving Social Security benefits.
• Confusing retirement age with Medicare age: Delaying Social Security does not automatically delay Medicare eligibility.
• Waiting for COBRA to end: COBRA may outlast the Medicare Part B Special Enrollment Period.
• Ignoring Part D: Going without creditable drug coverage can lead to a lasting penalty.
• Contributing to an HSA after Medicare starts: Retroactive Part A coverage can create excess contributions.
• Canceling household Marketplace coverage incorrectly: End coverage only for household members moving to Medicare.
• Choosing a plan by premium alone: Networks, prescriptions, deductibles, copayments, and prior authorization matter.
• Failing to save application records: Keep confirmation numbers, forms, notices, and proof of employer coverage.

Practical Experiences and Lessons From Medicare Enrollment

The following composite scenarios reflect common Medicare enrollment experiences. They are not stories about specific identifiable applicants, but they illustrate why timing and documentation matter.

Experience 1: Applying before the birthday month reduces stress

Consider a worker named Linda who plans to retire in the month she turns 65. She begins researching Medicare three months before her birthday, confirms that her employer coverage will end on her retirement date, and applies for Part A and Part B online. She saves the confirmation page and checks her application status two weeks later.

Her Medicare card arrives before retirement, allowing her to enroll in a Part D plan and Medigap policy without rushing. She also schedules existing prescriptions so she has enough medication during the transition. Nothing dramatic happenswhich, in health insurance, is the equivalent of winning a small lottery.

The lesson is simple: early enrollment creates time to correct errors, compare plans, and coordinate effective dates. Applying during the first three months of the Initial Enrollment Period is usually easier than trying to solve everything after employer coverage has disappeared.

Experience 2: COBRA is not a substitute for understanding Medicare deadlines

Now imagine Robert, who retires at 66 and chooses COBRA because it lets him keep the same insurance card. He assumes he can wait until COBRA ends before enrolling in Part B. Ten months later, he learns that his Part B Special Enrollment Period was tied to the end of active employment, not the eventual expiration of COBRA.

Robert may need to use the General Enrollment Period, could experience a gap in outpatient coverage, and may owe a late-enrollment penalty. The expensive part of the mistake is not that he chose COBRA; it is that he chose it without confirming how it coordinated with Medicare.

A better approach is to contact Social Security and the employer benefits office before retirement. Ask when active-employment coverage officially ends, whether Medicare becomes primary, and what documentation will be available for a Special Enrollment Period.

Experience 3: The HSA surprise

Maria works until age 68, remains covered by a qualifying employer plan, and continues contributing to an HSA. When she retires, she applies for premium-free Part A and Part B. Part A is made retroactive for several months, overlapping with recent HSA contributions.

Her tax preparer explains that contributions made for months covered by Medicare may be excess contributions. Maria must calculate the excess and take corrective action. Had she reviewed the retroactive Part A rule earlier, she could have stopped HSA contributions in advance and avoided an unwelcome tax-season puzzle.

The practical lesson is to coordinate Medicare enrollment with payroll and HSA contributions well before retirement. Medicare questions can become tax questions surprisingly quickly.

Experience 4: The cheapest premium is not always the cheapest plan

James compares several Medicare Advantage plans and initially chooses the one with a zero-dollar additional premium. Before completing enrollment, however, he checks the network and discovers that his cardiologist is not included. He also learns that one of his medications is placed on a costly formulary tier.

Another plan charges a modest monthly premium but includes his physicians and offers better prescription coverage. When James estimates the full yearincluding premiums, copayments, prescriptions, and specialist visitsthe second plan is less expensive for his actual needs.

This experience demonstrates why applicants should compare total costs rather than advertisements. A plan with an attractive premium can become expensive when doctors are out of network or medications are poorly covered.

Experience 5: Free counseling can prevent costly errors

Finally, consider Susan, who feels overwhelmed by letters from Social Security, Medicare, her employer, and several insurance companies. Instead of selecting the first plan brochure with a cheerful photograph, she contacts her local SHIP program.

A counselor helps her identify the correct enrollment period, compare Original Medicare with Medicare Advantage, review her prescriptions, and apply for a Medicare Savings Program. The counseling is free and does not involve an insurance sales commission.

Her experience offers perhaps the best Medicare lesson: asking for help is not a sign that you failed to understand the system. The system is genuinely complicated. A careful application, written records, and unbiased guidance can prevent penalties and produce coverage that fits both medical and financial needs.

Final Takeaway

To apply for Medicare successfully, start by determining whether enrollment will be automatic. If you must apply, use the Social Security Administration for Part A and Part B, or the Railroad Retirement Board when applicable. Mark your Initial Enrollment Period on a calendar, investigate any Special Enrollment Period before delaying Part B, and carefully coordinate Medicare with employer coverage, COBRA, Marketplace insurance, and HSA contributions.

After enrolling in Part A and Part B, compare Original Medicare, Medigap, Medicare Advantage, and Part D based on your personal doctors, prescriptions, budget, and travel needs. Keep copies of everything, review your Medicare card, and ask for free SHIP counseling when the choices begin to resemble alphabet soup served with deductibles.

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