Medicare Supplement Rules in Texas: Enrollment and Consumer Rights

Texas Medicare Supplement rules determine when you can purchase coverage without health screening, when insurers may review your medical history, and which protections apply if you lose other insurance.

The most useful way to understand the rules is to separate your right to enroll from the standardized benefits of the policy itself.

How Medigap works with Medicare in Texas

Medigap is private insurance that supplements Original Medicare Part A and Part B. It does not replace Original Medicare, and it does not usually include outpatient prescription drug coverage.

A standardized Plan G covers the same categories of benefits regardless of the insurer, but prices and discounts vary. If you are deciding among plan letters, compare Plan G, Plan N and High-Deductible Plan G.

Your six-month Medigap open enrollment period

For most people, the strongest enrollment protection begins the first month they are both 65 or older and enrolled in Medicare Part B. The period lasts six months. During it, insurers generally cannot reject an application for an available Medigap policy or charge a higher premium because of health conditions.

It is separate from the October 15–December 7 Medicare election period, which concerns Medicare Advantage and Part D. The exact Part B effective date matters more than the date you request a quote.

See Medigap enrollment timing in Texas.

What if you keep employer coverage after 65?

Someone who delays Part B because they have qualifying active employer group coverage may start the Medigap six-month window later, when Part B actually begins. But retiree coverage and COBRA do not always protect you from Part B late enrollment consequences.

Verify whether the employer coverage is based on current employment and coordinate your Part B start date before leaving work. Our Medicare and employer coverage guide explains who pays first.

When insurers can use medical underwriting

Outside open enrollment or a guaranteed-issue event, Texas Medigap insurers may ask about diagnoses, treatments, medications, recent hospital stays and other health history. An insurer can sometimes decline an application or apply permitted conditions.

Standards differ, so an approval with one insurer does not guarantee approval with another. You should not cancel an existing guaranteed-renewable policy based on a quote or an application receipt.

Read common Medigap underwriting questions and when coverage can be denied.

What events create guaranteed-issue rights?

Federal and Texas protections can apply after specified losses of other coverage, including certain Medicare Advantage nonrenewals, loss of a plan's service area, some employer or union coverage terminations, and qualifying first-year Medicare Advantage trial rights.

The triggering event, eligible plan letters, application deadlines and documentation all matter. A doctor's network departure or an ordinary premium increase does not automatically provide the same protection.

Keep notices and read Texas guaranteed-issue rights.

What Texas does differently for beneficiaries under 65

Texas offers additional Medigap protections to certain people who have Medicare before 65. The options differ depending on whether Medicare entitlement is based on disability, ALS or end-stage renal disease.

In particular, the Plan A protection for many disability beneficiaries is not identical to the broader protections for qualifying ALS and ESRD beneficiaries. Confirm the applicable rules with Texas Department of Insurance's Medicare Supplement guide; do not assume an insurer's age-65 quote applies to someone who is 58.

Does Texas have a birthday switching rule?

Texas does not have a general annual Medigap birthday rule. A policyholder who turns 73 does not automatically receive an underwriting-free opportunity to change companies. However, a person who had Medicare before 65 generally receives a new Medigap open enrollment period when turning 65 while enrolled in Part B.

This is an important distinction. See Texas birthday rule explained.

How to replace an existing policy safely

First determine whether you qualify for protected enrollment or must pass underwriting. Second, compare the same standardized plan across insurers using the same applicant information and effective date.

Third, ask about discounts, premium rating methods and any applicable waiting periods. Fourth, obtain the new insurer's written approval and effective date. Finally, coordinate the old policy's termination so there is no unintended gap.

See how to switch Medigap policies.

Practical examples

Example: New to Part B at 67. A Texas resident retires at 67 and enrolls in Part B after qualifying employer coverage. Their six-month Medigap window generally starts with Part B, even though they are older than 65.

Example: Switching at 75. A Plan G policyholder wants a cheaper insurer. Unless a separate protected right applies, underwriting may be required.

Example: Advantage plan ends. A formal nonrenewal may trigger special protections, but the beneficiary must verify the deadlines and permitted plan letters.

Frequently asked questions