How to Apply for Medicare Part B and D in 2026

Medicare Part B and Part D Basics

Medicare Part B and Part D are essential components of the Medicare program, designed to ensure that seniors and qualifying individuals with disabilities have access to the care and prescriptions they need. Medicare Part B covers outpatient medical services-such as doctor’s visits, preventive screenings, lab work, mental health services, and durable medical equipment. Enrolling in Part B is crucial for accessing comprehensive medical care, as it picks up where Part A (hospital insurance) leaves off. Medicare Part D complements this by offering prescription drug coverage through private insurers. In order to qualify for Part D, you must have Medicare Part A or B, reside in the plan’s service area, and be a U.S. citizen or lawfully present in the country.

One of the most notable updates for 2026 is the Part D out-of-pocket cost cap: your prescription drug costs are capped at $2,100. Once you reach this annual cap, you pay $0 for drugs covered by your plan for the remainder of the year. The 2026 enrollment process also uses a streamlined Part D enrollment form, removing unnecessary demographic questions and clarifying rights and special periods such as SEPs (Special Enrollment Periods) and Medigap rights.

Understanding the differences between coverage types is vital for making informed decisions. If you’re interested in extended medical coverage beyond what Parts A and B offer, explore supplemental coverage options like those detailed in Medicare Supplement Plans in Mississippi for 2026.

When to Enroll – Key Periods

Enrolling in Medicare Part B and Part D is limited to certain election periods. Missing these windows can result in permanent premium penalties. Here’s a breakdown of the critical timelines for 2026:

• Initial Enrollment Period (IEP): A seven-month period (three months before, the month of, and three months after your 65th birthday), in which you can enroll in Parts A, B, and D. For those qualifying due to disability/ESRD, a similar seven-month window applies.
• Annual Enrollment Period (AEP)/Open Enrollment: October 15 – December 7 each year. Change or join a Part D or Medicare Advantage (MA) plan for coverage starting January 1, 2027.
• General Enrollment Period: January 1 – March 31 annual window, for those who missed their IEP to enroll in Parts A and B. Coverage begins the month after you sign up. Late enrollment penalties may apply.
• Special Enrollment Periods (SEPs): Triggered by qualifying life events-losing employer coverage, moving, gaining eligibility for Extra Help, etc.-allowing you to enroll or switch plans without penalty.

Enrollment Period	When	What You Can Do	Coverage Start
Initial (IEP)	3 months before to 3 months after 65th birthday month	Join Parts A/B, then D	Varies by signup timing
Annual (AEP)	Oct 15-Dec 7	Join/switch Part D	Jan 1 next year
General	Jan 1-Mar 31	Join Parts A/B (if missed IEP)	Month after signup
Special (SEP)	Varies by event	Join/switch based on qualifying event	Often 1st of next month

For more insight on timing and strategies for choosing the right plan for your needs, explore How to Choose the Right Medicare Plan for 2025.

Step-by-Step: How to Apply for Part B

1. Check eligibility: You qualify if you’re turning 65, under 65 with disability or End-Stage Renal Disease (ESRD), or meet certain work history requirements. (See details at How to Get Medicare.)
2. Gather necessary information: Locate your Medicare card (for your Medicare number and Part A start date).
3. Apply during a valid period: Enroll during the IEP, General Enrollment Period, or a Special Enrollment Period. Use the official CMS-40B application form, available on Medicare.gov. Or, call 1-800-MEDICARE (1-800-633-4227) for assistance.
4. Submit your application: Options include:
   • Online: Submit at SSA.gov.
   • Mail: Print and send the required forms to your local Social Security office.
   • In-person: Visit a Social Security Administration (SSA) office for hands-on help.

   Note: If already receiving Social Security benefits, you’re usually auto-enrolled in Part B four months before turning 65. Always confirm using your Medicare card.

5. Coverage start dates: If signing up during the General Enrollment Period, coverage begins the month after you apply. Those covered through employer insurance can delay Part B without penalty, but must enroll promptly after losing such coverage to avoid a late enrollment penalty.

Part B is the foundation for outpatient care. For a broader understanding of covered services beyond Part B and D, review What Does Medicare Pay For? Coverage Breakdown for an in-depth overview.

Step-by-Step: How to Apply for Part D

1. Check prerequisites: Ensure you’re enrolled in Medicare Part A or Part B, live within your selected plan’s service area, and are a U.S. citizen/lawfully present.
2. Compare plans: Utilize the Medicare.gov Plan Finder to enter your medications, ZIP code, and preferences to compare drug formularies, premiums, and plan star ratings. If you need specific local details, use the “compare Part D plans ZIP code” feature.
3. Select your enrollment period: Apply during your IEP (when first eligible), AEP (Oct 15-Dec 7 annually), or SEP (due to specific life events).
4. Choose an enrollment method:
   • Online: Enroll through Medicare.gov or directly on the chosen plan’s website (be sure to use the updated 2026 enrollment form).
   • Phone: Contact 1-800-MEDICARE or your selected plan provider.
   • Mail: Submit a paper application to your plan sponsor. For 2026, make sure to use the revised form.
5. Wait for your approval: Plans process your request. The start date is usually the first day of the following month, or January 1 for AEP changes.

If you’re unsure about how Part D interacts with supplemental plans or dental/vision benefits, see “Why Medicare Doesn’t Cover Dental: 2026 Facts & Options.”

Avoid Late Penalties & Get Extra Help

Missing your enrollment deadlines can be costly-permanently. Here’s how penalties work and how to avoid them:

• Part B late enrollment penalty: If you miss your IEP (and don’t have employer/union group coverage), your premium increases by 10% for each 12-month period you were eligible but not enrolled. This penalty is permanent.
• Part D late enrollment penalty: If you go more than 63 days without creditable prescription drug coverage after your IEP, you pay a penalty-1% of the “national base beneficiary premium” for each uncovered month, added for life to your Part D premium.
• Penalty avoidance tips: Always document creditable coverage, and enroll promptly following any loss of other insurance.

Extra Help (Low-Income Subsidy) can dramatically lower prescription drug costs if you qualify. Apply through SSA.gov or call 1-800-MEDICARE. Eligibility for Extra Help not only reduces premiums and co-pays but also grants a Special Enrollment Period to enroll in Part D without incurring a penalty. If your financial resources are limited, be sure to explore these options and apply immediately-with more info at How to Get Medicare.

Compare Plans in Your Area

The best way to secure affordable and comprehensive coverage is to compare plans based on your unique needs and location. Using the Medicare.gov Plan Finder, you can:

• Enter your ZIP code and medication list for tailored results.
• Filter plans by cost, formulary, premium, deductible, yearly out-of-pocket cap, and star ratings.
• See which pharmacies are in the plan’s network and what your drug costs will look like each month.
• Download or print comparison tables and use plan star ratings to evaluate quality and customer experience.

For a detailed breakdown of what Medicare plans do and do not cover-including the nuances between Part B, Part D, and supplemental options-see What Does Medicare Pay For? Coverage Breakdown.

What Happens After Enrollment

• You’ll receive confirmation of enrollment and an updated Medicare card, typically within three weeks of application approval.
• Part B premiums are either automatically deducted from your Social Security check or directly billed to you.
• For Part D, you’ll get a separate ID card from your Part D plan administrator; your new coverage begins per the enrollment period rules-usually the first of the next month.
• Each year, you’ll receive an Annual Notice of Creditable Coverage to show other insurers or prove eligibility for penalty waivers if switching coverage.
• If there are issues or errors with your enrollment, you have the right to appeal with your plan or contact Medicare directly for resolution.

This process ensures seamless access to needed medical services and prescriptions. For more on supplemental plan options or additional coverage that coordinates with Medicare, review Medicare Supplement Plans in Mississippi for 2026.

FAQs

Can I enroll in Part B during the AEP?

No. The Annual Enrollment Period (AEP) is only for changing or enrolling in Medicare Advantage or Part D plans. For Part B, use the General Enrollment Period (Jan 1 – Mar 31) or a Special Enrollment Period if eligible due to loss of other coverage.

Is enrollment in Part B automatic?

If you are receiving Social Security benefits before you turn 65, you will be automatically enrolled in Parts A and B four months before your birthday. If not, you need to apply manually.

What’s new for 2026?

The Part D enrollment form has been simplified; out-of-pocket costs for drugs under Part D are capped at $2,100, providing substantial savings potential for high-usage beneficiaries.

What if I missed my IEP?

If you miss your Initial Enrollment Period, you can sign up during the General Enrollment Period each year. However, unless you qualify for an SEP penalty waiver (such as loss of employer coverage), you may face a late enrollment penalty that impacts your premiums for life.

How can I verify what’s covered?

Consult your plan’s formulary and check your coverage at What Does Medicare Pay For? Coverage Breakdown for up-to-date coverage specifics and exclusions.

If you’re preparing for your 2026 enrollment or need more tailored advice about plan selection, penalty avoidance, or supplemental solutions, our comprehensive guides-including How to Choose the Right Medicare Plan for 2025-have you covered.