Buying a Medigap Plan Under 65 While on SSDI

Federal law does not require insurance companies to sell Medigap policies to people under 65, Medicare.gov states plainly. If you are on SSDI and under 65, whether you can buy this supplemental coverage at all depends almost entirely on the state where you live, and where it is available it often costs much more than it will later.

The good news is that everything changes at 65, when a guaranteed enrollment window opens everywhere. This article explains the under-65 landscape and what to do in the meantime.

What a Medigap plan does

Medigap, also called Medicare Supplement Insurance, is private insurance that fills the cost gaps in Original Medicare. In 2026 the Part B deductible is $283 per year, and after it is met Original Medicare typically pays 80 percent of approved amounts, leaving you responsible for the other 20 percent with no cap on the total. A Medigap plan pays some or all of those leftover amounts depending on the plan.

Medigap policies are standardized by federal law into lettered plans, which Medicare's publication Choosing a Medigap Policy (CMS product 02110) describes in detail. Plans C and F are no longer sold to people who became eligible for Medicare on or after January 1, 2020, because they cover the Part B deductible. You pay the insurer a monthly premium on top of your Part B premium, which is $202.90 per month for most people in 2026 under the CMS premium announcement.

Why being under 65 is different

The core problem is the enrollment window. Federal law gives everyone a 6-month Medigap open enrollment period that starts the first month they are 65 or older and enrolled in Part B. Before 65, that protection simply does not exist under federal rules.

During open enrollment, an insurer cannot deny you, cannot charge you more because of health problems, and generally cannot make you wait for coverage of pre-existing conditions. Outside that window, and before 65, insurers in most states can use medical underwriting, which means they can review your medical history, price you up, or refuse to sell to you at all.

The federal rules in brief

Here is what federal rules do guarantee, at any age:

• You must have Medicare Part A and Part B to buy any Medigap policy
• A Medigap policy covers only one person, so a spouse needs a separate policy
• Once a policy is sold and you pay the premium, the insurer cannot cancel it, a protection Medicare describes as guaranteed renewability
• Standardized plans make comparison shopping possible, because a Plan G from one insurer offers the same basic benefits as a Plan G from another

Here is what federal rules do not guarantee before 65:

• No company has to sell to you at all
• No open enrollment window applies
• No cap applies to what a company can charge when it does sell

Medicare.gov's guidance on when you can buy a Medigap policy says it depends on your state, and warns that people with Medicare because of ESRD or disability may not be able to buy the policy they want, or any policy, until they turn 65.

State rules decide your access

States fill the federal gap in very different ways, and Medicare.gov itself does not keep a single national list. Its advice is to contact your State Insurance Department, and the same pages direct readers to their State Health Insurance Assistance Program (SHIP) counselor for free local help.

In general terms, states fall into a few broad patterns. Some states require insurers to offer at least one Medigap plan to beneficiaries under 65. Some go further and open all plans to under-65 buyers or restrict what they can charge. Other states have no requirement at all, and in those places an under-65 disability beneficiary may find that no company will sell a policy at any price.

Because these rules change state by state and year by year, verify your current rights before assuming anything. Your State Insurance Department and your SHIP counselor are the right starting points, and both are free.

What under-65 coverage costs

Where Medigap is sold to people under 65, premiums are frequently much higher than the premiums charged to 65-year-olds, because insurers may base price on age in most states. There is no government-published standard rate, so the only reliable way to price a policy is to compare actual quotes.

Use the Medicare Plan Finder at Medicare.gov to see the Medigap policies available in your zip code, and note both the premium and any underwriting rules. Also budget for the parts of Medicare that Medigap does not touch: the Part B premium of $202.90 per month in 2026, and any Part D drug plan premium if you buy separate drug coverage.

A few protections that apply at any age

Two lesser-known rules from official sources are worth remembering. First, the guaranteed renewability rule means that once you are in, staying in is usually the safest course. If you buy an under-65 policy, think hard before dropping it, because you may not get another offer.

Second, the official CMS booklet How Medicare Works With Other Insurance (product 02179, February 2026 edition) describes a special protection if you lose retiree coverage because a former employer goes bankrupt and you cannot get COBRA continuation coverage. In that situation, you may have the right to buy a Medigap policy even if your open enrollment period is over. Your SHIP counselor can help you confirm whether the rule applies to you.

If no Medigap plan will sell to you

Plenty of SSDI beneficiaries live in states with no under-65 access, so it helps to know the alternatives.

Medicare Advantage Plans are the main one. These plans cover everything Original Medicare covers, usually bundle prescription drug coverage, and often add benefits like dental or vision. They cannot deny enrollment based on disability, and they have an annual out-of-pocket cap on covered services, which Original Medicare lacks. The tradeoffs are network restrictions and plan rules, which matter for anyone who travels or sees specialists.

Income-based programs stack on top of either choice. The Medicare Savings Programs described on Medicare.gov pay Medicare cost sharing or premiums for people with limited income, with 2026 income limits of $1,350 per month for an individual at the QMB level and $2,455 per month for a couple at the top QI level, and slightly higher bands in between. Qualifying for any of them also brings full Extra Help with drug costs, which caps drug copays at $12.65 per covered drug in 2026. Full Medicaid adds further protection for those who qualify.

Turning 65 changes everything

When the first month arrives in which you are both 65 and enrolled in Part B, your one-time 6-month open enrollment period begins anywhere in the country. During those 6 months you can buy any Medigap policy sold in your state with no medical underwriting, and no company can refuse you because of your disability or your medical history.

Mark the date. People who bought a limited or expensive under-65 policy can switch during this window, and people who were shut out entirely finally get in. Medicare's publication 02110 notes that in some cases an insurer can apply a waiting period of up to 6 months for pre-existing conditions if you have not had continuous creditable coverage, so continuous coverage before the switch matters.

Frequently asked questions

Can an insurance company turn me down for Medigap because I am under 65? In many states, yes. Federal law does not require companies to sell Medigap policies to people under 65, and Medicare.gov warns that some people with disability or ESRD cannot buy any Medigap policy until they turn 65. State law controls, so check with your State Insurance Department.

When do I get full Medigap rights? The first month you are 65 or older and enrolled in Part B, a one-time 6-month open enrollment period begins. During it, companies that sell Medigap in your state cannot deny you or charge more because of health conditions.

What are my options if no Medigap plan will sell to me? You can join a Medicare Advantage Plan, which covers everything Original Medicare covers and often includes drug coverage. Depending on income, a Medicare Savings Program or Extra Help can also lower your costs.

This article is general information, not legal advice. Medigap availability and Medicare figures change, and the 2026 amounts cited come from Medicare.gov and CMS publications. Consult a qualified representative, your State Insurance Department, or your SHIP counselor about your specific situation.