When Can You Enroll in Medigap in Texas?

Federal six-month window

Medigap open enrollment generally begins the first month you are at least 65 and enrolled in Part B. It lasts six months.

Insurers generally cannot deny coverage or charge more based on health during this protected window.

Working after 65

Some people with qualifying active employer coverage delay Part B. If Part B first begins at 67, the Medigap window generally begins then.

Our agency starts by reviewing employer coverage and expected retirement date. Read delaying Medicare while working.

After open enrollment

Insurers may use medical underwriting after the window unless a protected right applies.

Do not cancel an existing supplement before a replacement is approved.

Review what Medicare Supplement insurance covers before applying outside your protected enrollment window.

Guaranteed issue

Certain qualifying coverage losses and trial rights can create guaranteed-issue protections. Deadlines and documents matter.

An ordinary Annual Notice of Change does not automatically guarantee Medigap acceptance. See Medicare guidance.

Texas under-65 rules

Texas has specific Medigap rules for certain people who qualify for Medicare due to disability before age 65.

Do not assume another state's birthday switching law applies. Confirm your rights with the Texas Department of Insurance.

Different calendars

Fall Medicare Open Enrollment concerns Medicare Advantage and Part D changes, not everyone's Medigap window.

Confirm both Medicare plan-change rights and supplement acceptance before switching.

Timeline checklist

Record your birthday month, Part B effective date, employer coverage end date, and termination notices.

Determine whether you have open enrollment, guaranteed issue, or need underwriting. See enrollment periods.

How to calculate your personal deadline

Find the effective date printed on your Medicare Part B record. If you are at least 65 on that date, the federal Medigap open enrollment period generally begins in that month and runs for six months.

For example, a person who is already 66 when Part B begins on September 1 generally has a Medigap open enrollment period from September through February.

The date of a Medigap quote does not extend the statutory window.

Apply with enough time for processing and verify the requested policy effective date. If you are close to the end of the window, do not rely on an informal conversation as proof that an application was submitted.

Why the Part B start date matters more than retirement alone

Retirement is a life event, but it does not automatically determine when federal Medigap protections begin. The federal six-month period is tied to being at least 65 and enrolled in Part B.

Someone who enrolled in Part B at 65 but continued working may have used the federal window even without purchasing a supplement. Someone who legitimately delayed Part B until retirement at 68 may have a later window.

This distinction is why a coverage review should begin with the Medicare record, employer plan status, and retirement timeline rather than simply asking the applicant's age.

How guaranteed issue differs from open enrollment

Open enrollment is a personal six-month period tied to age and Part B enrollment. Guaranteed issue is a separate protection triggered by specific qualifying events, with its own application rules and deadlines.

Examples can include certain situations in which other coverage ends or an eligible person exercises a Medicare Advantage trial right. The particular facts matter, and not every plan change qualifies.

Keep the insurer's termination notice, proof of prior coverage, and any Medicare plan correspondence. When a right is time-limited, documentation can be essential to establishing eligibility.

What happens if you want to switch Medigap companies

A policyholder may find another insurer offering a lower monthly premium for the same standardized letter. However, a lower quote does not mean the applicant has a guaranteed right to switch.

Outside a protected window, the new insurer may use health underwriting. The applicant should understand the approval process before deciding whether to replace an existing policy.

If the new policy is approved, compare effective dates carefully to avoid a gap or unnecessary overlap. Never assume a quote is equivalent to an issued policy.

For a Texas-specific carrier comparison, see Blue Cross Blue Shield versus UnitedHealthcare Medigap plans.

How Medicare Advantage transitions complicate timing

A person returning from Medicare Advantage to Original Medicare may need to coordinate several changes: disenrollment from the Advantage plan, possible standalone Part D coverage, and a Medigap application.

The Medicare plan-change window and the right to purchase Medigap are separate legal questions. A person may be allowed to leave Medicare Advantage but still face supplement underwriting.

Certain qualifying trial rights or coverage terminations can provide protection. Verify the exact circumstances before canceling coverage or assuming that any Medigap company must accept you.

What to document before you apply

Prepare your Medicare Part A and Part B effective dates, proof of employer coverage if relevant, and any termination or nonrenewal letters. Keep copies of previous policy information.

If an insurer requests underwriting, answer the application questions accurately and ask how approval will be communicated. Do not treat a verbal estimate as an acceptance decision.

If you believe you have a guaranteed-issue right, identify the event, deadline, and supporting documents. Medicare and the Texas Department of Insurance can help clarify the applicable protections.

An example of delayed Part B enrollment

Imagine a Texas resident who turns 65 in May but continues working for an employer offering qualifying group health coverage. The resident delays Part B and plans to retire at 68.

If Part B first begins in October at age 68, the federal six-month Medigap open enrollment period generally begins in October.

The resident should verify the Part B effective date and apply for the desired supplement in time.

Now imagine a different resident who enrolled in Part B at 65 but kept employer coverage until 68. That person's federal Medigap open enrollment window generally began at 65, not at retirement.

The examples illustrate why retirement date alone is not enough to establish Medigap rights.

How to compare policies during your protected window

Once you confirm the federal window is active, choose the standardized benefit letter that meets your needs. Plan G, Plan N, and high-deductible options have different cost-sharing arrangements.

Then obtain quotes from multiple insurers using the same Texas ZIP code and application details. Review available discounts, rate history, and the policy's effective date.

Do not rush into a carrier solely because of a low advertised premium. Standardized benefits make comparisons easier, but the policy should remain affordable over time.

A final review before replacing coverage

If you already have a Medigap policy, ask whether a new application requires underwriting. Do not assume owning a supplement creates an ongoing right to change insurers without medical review.

Confirm that any replacement has been approved and that its effective date aligns with the old policy's end date. Retain written acceptance and billing information.

If a guaranteed-issue event is involved, keep the notice establishing the event and submit within the applicable deadline.

Where to confirm an enrollment right

Medicare can explain federal Medigap protections and the rules for qualifying coverage losses. The Texas Department of Insurance can provide information about state-specific requirements and consumer protections.

Ask for the applicable deadline and required proof in writing when possible. Keep copies of your Medicare effective dates, plan notices, and submitted applications.

Frequently Asked Questions