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Open Enrollment vs Annual Enrollment: Difference Between AEP and OEP

AEP allows all beneficiaries to change their Medicare Advantage or Part D plans. OEP only allows those already enrolled in a Medicare Advantage plan to make a one-time switch or return to Original Medicare.

6 mins read
AEP vs OEP
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Key Takeaways

  • Medicare Annual Enrollment Period (AEP) (Oct 15 – Dec 7) lets all Medicare beneficiaries enroll in, switch, or drop Medicare Advantage and Part D plans.
  • Open Enrollment Period (OEP) (Jan 1 – Mar 31) allows current Medicare Advantage enrollees to make a one-time plan change or return to Original Medicare.
  • Timely action during these periods is crucial to optimize coverage and prevent being stuck with your current plan for the remainder of the year.

The Medicare Advantage Annual Enrollment Period (AEP) and the Open Enrollment Period (OEP) are critical times that allow you to change your healthcare coverage. Still, they serve distinct purposes and have specific guidelines.

Knowing these differences clarifies the enrollment process and empowers you to make choices that best suit your health needs and financial situation.

Annual Enrollment Period vs Open Enrollment Period

AEP allows all beneficiaries to change their Medicare Advantage or Part D plans. Medicare Advantage Open Enrollment (OEP) only allows those already enrolled in a Medicare Advantage plan to make a one-time switch or return to Original Medicare.

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Annual Enrollment Period (AEP)

The Medicare Annual Enrollment Period (AEP) occurs every year from October 15 to December 7. During this time, all Medicare beneficiaries can make various changes to their coverage. Any changes made during AEP take effect on January 1st of the following year.

Open Enrollment Period (OEP)

The Medicare Advantage Open Enrollment Period runs annually from January 1 to March 31. This period allows individuals already enrolled in a Medicare Advantage plan to make certain adjustments to their coverage. Changes made during OEP become effective on the first day of the month following the receipt of your request.

Eligibility Criteria

During AEP:

  • Who Can Make Changes: All Medicare beneficiaries, whether you have Original Medicare or are enrolled in a Medicare Advantage plan.
  • Special Considerations: The number of changes you can make during AEP is not restricted. The last change submitted before the deadline will take effect on January 1st.

During OEP:

  • Who Can Make Changes: Only individuals currently enrolled in a Medicare Advantage plan as of January 1 each year.
  • Restrictions: You cannot switch from Original Medicare to a Medicare Advantage plan during OEP. You cannot enroll in a standalone Medicare Part D (prescription drug) plan unless you switch back to Original Medicare.
  • Only one change is allowed during OEP, so choose carefully.
  • You can switch from a Medicare Advantage plan to Original Medicare and join a separate Medicare drug plan.

Annual Enrollment Period (AEP)

The Annual Enrollment Period (AEP) runs from October 15 to December 7, allowing all Medicare beneficiaries to review and potentially change their Medicare coverage for the upcoming year.

Actions You Can Take During AEP

  • Enroll in a Medicare Advantage Plan: If you have Original Medicare (Part A and B), AEP allows you to join a Medicare Advantage plan, which may offer additional benefits like prescription drug coverage, dental, and vision.
  • Switch Medicare Advantage Plans: If you’re already enrolled in a Medicare Advantage plan, you can switch to another plan with better coverage or lower costs.
  • Return to Original Medicare: If a Medicare Advantage plan no longer suits your needs, you can disenroll and return to Original Medicare. You can also enroll in a standalone Medicare Part D prescription drug plan.
  • Change Prescription Drug Plans: AEP allows you to enroll in, switch, or drop a standalone Medicare Part D plan if your medication needs have changed.
  • Review and Adjust Your Health Insurance Plan: During AEP, it is crucial to reevaluate your health insurance plan to ensure it meets your current healthcare needs. This period allows you to make necessary changes to your coverage for the upcoming year.
Action Annual Enrollment Open Enrollment
Enroll in a Medicare Advantage Plan Yes No
Switch Medicare Advantage Plans Yes Yes
Return to Original Medicare Yes Yes
Enroll in a Part D Prescription Drug Plan Yes Only if returning to Original Medicare
Switch or Drop Part D Plans Yes No
Number of Changes Allowed Multiple One-time change

Impact on Coverage

Changes made during AEP take effect on January 1 of the following year. Adjusting your plan helps you:

  • Align Coverage with Health Needs: Choose a plan that covers any new health conditions or medications.
  • Manage Costs: Review premiums and out-of-pocket expenses to select a plan that fits your budget.
  • Ensure Provider Access: Confirm that your preferred doctors and pharmacies remain in-network.

Open Enrollment Period (OEP)

The Medicare Advantage Open Enrollment (OEP) runs from January 1 to March 31 and is specifically for Medicare Advantage enrollees to make adjustments.

Actions You Can Take During OEP

  • Switch to a Different Medicare Advantage Plan: During the Medicare Advantage Open Enrollment Period, you can switch to another Medicare Advantage plan if your current plan no longer meets your needs. This period runs from January 1 to March 31, allowing you to reassess your coverage based on your healthcare needs.
  • Return to Original Medicare: You can disenroll from your Medicare Advantage plan and return to Original Medicare during the Medicare Advantage Open Enrollment Period. This also allows you to enroll in a standalone Part D plan for prescription drugs.

Limitations of OEP

  • Limited to Current Medicare Advantage Enrollees: Only those enrolled in a Medicare Advantage plan can make changes during OEP.
  • No Switching from Original Medicare to Medicare Advantage: This change is only possible during AEP or through a Special Enrollment Period.
  • One-Time Change: You can make only one change during OEP.

Impact on Coverage

Changes made during OEP take effect on the first day of the following month. Make sure to time your adjustments properly to avoid gaps or overlaps in coverage.

  • Ensure Continuous Coverage: Avoid lapses in healthcare or prescription drug coverage by reviewing effective dates carefully.
  • Review Plan Details: Switching plans may lead to changes in coverage, provider networks, or costs.

How to Decide Between AEP and OEP

Start by reviewing your current Medicare Advantage plan. Consider whether your plan still aligns with your healthcare requirements. Have there been changes in your health over the past year? New diagnoses, treatments, or medications could require different coverage options.

Also, reflect on any changes in your financial situation. Adjustments in income or expenses can affect what you can afford in terms of premiums, deductibles, and out-of-pocket costs.

Compare Plan Options

Key factors to consider when comparing plans:

  • Review Coverage Benefits
  • Check Provider Networks
  • Asses Costs
  • Know Prescription Drug Coverage

Review Coverage Benefits

Look beyond the basic coverage to see what additional benefits each plan offers. Some plans include dental, vision, hearing, or wellness programs. Ensure the plan covers the specific services and treatments you need.

Check Provider Networks

Verify that the plan’s network includes your preferred doctors, hospitals, and specialists. Changing plans might affect your access to certain healthcare providers, so confirming this beforehand is helpful.

Costs

Compare premiums, deductibles, copayments, and coinsurance amounts across different plans. Consider how these expenses fit into your budget and impact your overall healthcare costs throughout the year.

Prescription Drug Coverage

If you take medications, check each plan’s formulary to ensure your prescriptions are covered. Pay attention to any restrictions or requirements, such as prior authorizations or step therapy, that could affect your medication access.

Plan comparison tools through the Medicare website or trusted providers like CoverRight can help streamline this process.

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Stay Ahead with Deadlines, Eligibility Criteria, and Plan Insights

Preparing yourself before AEP and OEP is essential to securing the coverage that best suits your needs.

How to time your enrollment decision:

  • Mark Important Dates
  • Set Reminders
  • Prepare in Advance
  • Seek Expert Advice

Use CoverRight Expert Advice

If you’re unsure about your options, consider consulting a Medicare expert or advisor. They can provide personalized guidance to help you navigate the complexities of Medicare Advantage plans. Contact CoverRight for assistance tailored to your needs.

By comparing plan options and taking advantage during enrollment periods, you can make the best choices for your healthcare coverage and save on costs.

Frequently Asked Questions

Can I Switch from Original Medicare to Medicare Advantage During OEP?

Switching from Original Medicare to a Medicare Advantage plan is not allowed during the Open Enrollment Period (OEP). This action can only be taken during the Annual Enrollment Period (AEP), or if you qualify for a Special Enrollment Period.

What If I Need to Make Changes Outside of AEP and OEP?

You may be eligible for a Special Enrollment Period (SEP). SEPs are triggered by specific life events, such as:

  • Moving to a new address outside your current plan’s service area.
  • Losing existing coverage, like employer or union health insurance.
  • Qualifying for Medicaid or Extra Help with Medicare prescription drug costs.
  • Entering or leaving a care facility, such as a nursing home.

These events allow you to enroll in, switch, or disenroll from Medicare Advantage and Part D plans outside the standard enrollment periods.

How Do Changes Affect My Prescription Drug Coverage?

During AEP, you can:

  • Enroll in, switch, or drop a Medicare Part D prescription drug plan.
  • Make changes to your prescription drug coverage whether you have Original Medicare or a Medicare Advantage plan.

During OEP, changes to prescription drug coverage are limited:

  • If you switch Medicare Advantage plans, which include drug coverage, your prescription coverage will continue with the new plan.
  • If you disenroll from a Medicare Advantage plan and return to Original Medicare, you can enroll in a standalone Part D plan.

You cannot join, switch, or drop a standalone Medicare Part D plan during OEP unless you return to Original Medicare from a Medicare Advantage plan.

Maximize Your Medicare Advantage Benefits

Staying informed and seeking expert advice when needed empowers you to navigate changes confidently. Resources like CoverRight offer personalized assistance to help you optimize your Medicare benefits.

Ready to navigate your Medicare options with confidence? Contact CoverRight today for expert guidance tailored to your needs.

Richard Chan

Richard is based in New York. He is passionate about empowering consumers to take control of their health and finances. Prior to CoverRight, Richard had extensive experience working in financial services with over 8 years' experience in consumer lending and investment banking.