The Agent’s Go-To Guide for Open Enrollment 

Table of Contents

• What insurance agents need to know about open enrollment
• 7 enrollment periods your agency should know
• Manage every enrollment period with AMS+
• Frequently asked questions about open enrollment

What Do Insurance Agents Need to Know About Open Enrollment?

Most agencies think of “Open Enrollment” as a single season, but in reality, your clients aren't all enrolling at the same time.

Your team could be helping one client enroll in ACA Marketplace coverage, guiding another through the transition to Medicare at age 65, and helping a third client navigate their company's annual employee open enrollment.

Each enrollment period comes with its own eligibility rules, deadlines, and requirements. Understanding these differences is essential to helping clients enroll in the right coverage at the right time.

What Are the Different Types of Open Enrollment Periods?

There are seven primary enrollment periods that health and life insurance agents work with. Each enrollment period follows its own timeline, applies to different clients, and requires specific actions from your team.

To help you stay organized, we’ve outlined who each period applies to and the important dates to keep in mind.

1. What Is the ACA Open Enrollment Period?

The ACA Open Enrollment Period (OEP) is the primary window when individuals and families can enroll in or make changes to Marketplace health insurance coverage.

Open Enrollment runs from November 1st through December 15th, 2026, although state-based Marketplaces may have different enrollment deadlines.

Clients who experience a qualifying life event during the year may be eligible for a Special Enrollment Period outside the standard OEP window.

Here are a few important reminders for your team:

• Marketplace enrollment dates vary by state, so always verify the deadlines.
• Encourage clients to review their coverage each year, even if they plan to keep the same policy.
• Make sure any required Consent to Contact documentation is in place before initiating outreach.
• Double-check that client contact information is up to date before enrollment season begins.
• Review Marketplace updates each year, including plan availability and carrier changes in the states you serve.

Preparing before Open Enrollment begins helps your team stay organized, provide better guidance to clients, and avoid last-minute surprises during enrollment season.

2. What Is the Medicare Annual Enrollment Period (AEP)?

The Medicare Annual Enrollment Period (AEP) is the primary window when current Medicare beneficiaries can make changes to their coverage. It runs every year from October 15th through December 7th, with any changes taking effect January 1st.

During AEP, Medicare beneficiaries may:

• Join, drop, or switch to another Medicare Advantage plan (including adding or dropping drug coverage)
• Switch from Original Medicare to Medicare Advantage, or switch from Medicare Advantage back to Original Medicare
• Join, drop, or switch a Medicare Part D prescription drug plan (including switching Part D plans while in Original Medicare)

With a high volume of client questions and enrollments, AEP is an important time for your agency to stay up to date on Medicare enrollment rules and compliance requirements.

Here are a few important reminders for your team:

• Obtain a Scope of Appointment before discussing Medicare Advantage or Part D plan options. Beginning October 1, 2026, CMS no longer requires a 48-hour waiting period, but the SOA must still be completed before the marketing discussion begins.
• Review the latest Medicare Communications and Marketing Guidelines (MCMG) before AEP begins.
• Be prepared to answer questions about plan benefits, provider networks, prescription drug coverage, and premiums.
• Encourage clients to review their Plan Annual Notice of Change (ANOC).

3. What Is the Medicare Advantage Open Enrollment Period?

The Medicare Advantage Open Enrollment Period (MA OEP) runs from January 1st through March 31st and is available only to individuals already enrolled in a Medicare Advantage plan.

During this time, members can switch to another Medicare Advantage plan or return to Original Medicare. Those who return to Original Medicare may also enroll in a standalone Part D prescription drug plan.

Here are a few important reminders for your team:

• Only clients who are already enrolled in a Medicare Advantage plan are eligible for this window. It is not available to those on Original Medicare or anyone enrolling in Medicare Advantage for the first time.
• Each beneficiary may make only one coverage change during the MA OEP.
• Plan changes take effect on the first day of the month following the change request.
• Encourage clients to review their current plan early in the window rather than waiting until the March 31st deadline.
• Confirm that all client contact information is up to date before beginning outreach.

Reaching out at the start of the year is one of the simplest things your team can do to make sure no client misses their only opportunity to adjust their Medicare coverage.

4. What Is the Medicare Initial Enrollment Period?

The Initial Enrollment Period (IEP) is the first opportunity most individuals have to enroll in Medicare. It begins three months before a person’s 65th birthday month, includes the birthday month, and continues for three months afterward, creating a seven-month enrollment window.

This period allows newly eligible individuals to enroll in Medicare without waiting for the next enrollment window.

• Medicare Part A (hospital insurance)
• Medicare Part B (medical insurance)
• A Medicare Advantage plan or standalone Part D prescription drug plan

Here are a few important reminders for your team:

• Your agency should start educating individuals six to twelve months before they turn 65, using birthday-triggered workflows.
• If a client misses their IEP without other creditable coverage, they may face a Late Enrollment Penalty. This is a real financial consequence worth communicating to clients.
• Clients already receiving Social Security benefits may be automatically enrolled in Parts A and B. Encourage them to confirm their enrollment status rather than assuming coverage is in place.

Getting ahead with helpful, proactive outreach is how your team can protect clients from penalties they may not even know exist.

5. What Is the Medicare General Enrollment Period?

The Medicare General Enrollment Period (GEP) runs from January 1st through March 31st and is for individuals who missed their Initial Enrollment Period and do not qualify for a Special Enrollment Period.

Here are a few important reminders for your team:

• Clients who enroll here will likely face a Late Enrollment Penalty that permanently increases their monthly Part B premium by ten percent for each full year they went without coverage.
• The GEP runs at the same time as the Medicare Advantage Open Enrollment Period, but they serve different purposes. The GEP is for people enrolling in Original Medicare for the first time, whereas the MA OEP is only for people who are already enrolled in a Medicare Advantage plan and want to make a change.
• Clients who enroll in Part B during the GEP also have a window to add a standalone Part D plan. Encourage them to act quickly to avoid a permanent late enrollment penalty.
• Clients who are still actively working past 65 and covered by an employer plan may qualify for a Special Enrollment Period, which allows them to enroll without a penalty. The GEP should not be their default option. Always review each client's situation before making a recommendation.

The rules around the GEP can get complicated quickly, so taking time to review each client's circumstances before making a recommendation is important.

Note: Clients who enroll during the GEP can expect their coverage to begin the first of the month following the month they enroll — a change from the old July 1 start date.

6. What Is a Special Enrollment Period?

A Special Enrollment Period (SEP) allows eligible individuals to enroll in or change coverage outside of the standard Open Enrollment window after experiencing a qualifying life event. For ACA Marketplace clients, the SEP window is generally 60 days from the date of the qualifying event. For Medicare clients, most SEPs provide a two-month window.

Examples of qualifying life events may include:

• Losing employer-sponsored health coverage
• Getting married
• Having or adopting a child
• Moving to a new service area
• Losing Medicaid or CHIP eligibility
• Other qualifying circumstances established by program rules

Here are a few important reminders for your team:

• SEP eligibility depends entirely on individual circumstances, so review each client's situation carefully before recommending coverage options.
• Keep in mind that the window opens at the qualifying event, not at the first conversation with your agency. Waiting on outreach can cost clients their opportunity to enroll.
• Most SEPs require clients to provide supporting documents, like a letter confirming loss of coverage or proof of a move.
• Moving only triggers a SEP if the client is moving to a new coverage area. A move within the same area does not count.

Life changes fast, and clients need an agent who is ready when things change.

7. When Can Employees Enroll in Group Benefits?

Group benefits enrollment periods are usually tied to an employer's plan year and give employees the opportunity to enroll in, change, or renew their workplace benefits.

Most plans renew on January 1st or July 1st, but the renewal date varies by employer so your team should track each client's specific timeline.

Outside of the standard renewal period, employees may be eligible to make coverage changes if they experience a qualifying life event.

Here are a few important reminders for your team:

• Renewal dates vary by group. Build each employer group's timeline into your agency management system (AMS) so nobody gets forgotten about.
• Encourage employer clients to communicate enrollment deadlines clearly to their employees well before the window opens.
• Confirm that employee and dependent information is accurate before enrollment begins to avoid delays or coverage errors.

Group benefits clients count on your team to know their timeline before they do. Staying ahead of each employer's renewal calendar is one of the most practical ways your agency can deliver consistent, year-round value. 

How Can an AMS Help Your Agency Better Manage Every Enrollment Period?

Each enrollment period comes with its own deadlines, eligibility requirements, and client communication needs. An industry-specific agency management system (AMS) gives your team one place to track everything, helping prevent missed enrollment windows and last-minute scrambles.

With AMS+, an AgencyBloc solution, your agency can:

• Set up birthday-triggered workflows to reach Medicare clients before their Initial Enrollment Period opens
• Automate outreach around AEP, OEP, & each employer group's renewal timeline
• Store client & policy data in one centralized place so your team always knows where each client stands
• Track qualifying life events & flag clients who may be eligible for a Special Enrollment Period
• Manage compliance documentation, including Scopes of Appointment, in one organized system

FAQ

When does the 2027 Open Enrollment Period start? The 2027 ACA Open Enrollment Period opens November 1, 2026 on the federal Marketplace and in most states. The federal Marketplace end date is December 15, 2026, though a June 2026 court ruling may allow some state-based Marketplaces to extend their deadlines. Always confirm your state's specific deadline before beginning outreach.

What is the Medicare Advantage Open Enrollment Period?

The Medicare Advantage Open Enrollment Period is the window where seniors can switch to a different Medicare Advantage plan or drop Medicare Advantage to go back to Original Medicare (Part A and B). Seniors can enroll in a Medicare Advantage plan during their Initial Enrollment Period, during the Annual Enrollment Period (AEP), or if they qualify for a Special Enrollment Period. Only seniors who are already enrolled in a Medicare Advantage plan are eligible for the Medicare Advantage Open Enrollment Period.

Besides eligibility requirements, the most significant difference between the traditional Open Enrollment Period and the Medicare Advantage Open Enrollment Period is when they occur. The Medicare Annual Enrollment Period (AEP) runs from October 15th to December 7th, while the Medicare Advantage Open Enrollment Period runs from January 1st to March 31st each year.

What is the difference between Open Enrollment and AEP?

Open Enrollment generally refers to the ACA Marketplace enrollment period, while AEP is the Medicare Annual Enrollment Period for Medicare beneficiaries.

What is a Special Enrollment Period?

A Special Enrollment Period allows eligible individuals to enroll in or change coverage outside of Open Enrollment after experiencing a qualifying life event.

What happens if someone misses Open Enrollment?

It depends on the coverage type. For ACA Marketplace clients who miss Open Enrollment without qualifying for an SEP, they'll generally need to wait until the next OEP to enroll or make changes — unless they qualify for Medicaid, which is available year-round.

For Medicare clients, missing an enrollment window without qualifying for an SEP typically means waiting for the General Enrollment Period and potentially facing permanent late enrollment penalties on Part B and/or Part D. The longer a client waits, the higher those penalties can grow.

Posted by Shannon Beck on Tuesday, July 21, 2026 in Insurance Agents/Agencies

1. compliance management
2. insurance automation
3. open enrollment
4. productivity