When Can I Enroll in Medigap? Understanding Your Timing Options

Medigap plans are private insurance policies that help cover some of the costs Original Medicare does not pay. They are sold by private insurance companies, not by the government. Enrollment timing matters because it can affect whether a company must sell you a policy.

The main window is called the Medigap open enrollment period. During it, insurers are generally required to sell you a policy without asking health questions or charging more because of your health. It is usually a one-time window tied to when you have Part B and are age 65 or older.

Outside that window, you may face medical underwriting, which means a company may review your health history. Some situations, called guaranteed issue rights, can give you protected access to certain plans again. These rules vary by state and change over time, so confirm current details with Medicare.gov, your State Health Insurance Assistance Program (SHIP), or a licensed agent.

Many people plan around turning 65. They line up Medicare Part A and Part B first, then look at Medigap plans during the open enrollment window that follows. This is a common path for first-time enrollees.

Others look at Medigap later, such as after trying a Medicare Advantage plan, losing other coverage, or moving. Whether they can switch back, and how, depends on their situation and their state's rules. Some states offer extra flexibility, such as birthday or anniversary rules, while others do not.

Plan letters are part of the timing picture too. Only Plans A, B, D, G, K, L, M and N (and high-deductible Plan G) are sold to people newly eligible for Medicare. Plans C and F (and high-deductible F) are available only to people who became eligible before January 1, 2020. Plans E, H, I and J were discontinued and are not sold today. Massachusetts, Minnesota and Wisconsin standardize Medigap differently.

A Medigap agent may help you work out which enrollment window applies to you. That can depend on your age, when Part B started, your current coverage, and where you live. An agent can also explain how your state's rules may apply.

A conversation is usually informal. The agent may ask about your Medicare start date, your doctors, your prescriptions and your budget comfort. Medigap and Medicare Advantage are both real options with different trade-offs. Medigap generally allows any provider nationwide that accepts Medicare, with no network or referrals, and predictable cost-sharing. It also generally has higher monthly premiums, may involve underwriting outside certain windows, needs a separate Part D plan for drugs, and does not include routine dental, vision or hearing. Medicare Advantage often has lower premiums, an annual out-of-pocket maximum, extra benefits and drug coverage in many plans, but it may involve networks, prior authorization and copays.

Good questions to ask include: Which windows am I in right now? Would I need to answer health questions? Are there deadlines I should know about? What does my state do differently? An agent may help with these, though nothing is guaranteed. Call 1-800-MEDIGAP for more information.