Kidney Failure and Medicare in Harris County: The Coverage Timeline, and the New Texas Medigap Right for Under-65 Patients

Drive almost any stretch of Houston — the Gulf Freeway, Bellaire, Aldine, Baytown — and you will pass a dialysis center. Most people never register them. For the families inside, the building is the center of the week: three sessions, four hours each, indefinitely.

Kidney failure occupies a strange and specific place in American health coverage. It is the only condition that makes a person eligible for Medicare at any age. A 34-year-old in Pasadena who starts dialysis becomes Medicare-eligible the same way a 66-year-old does. That has been federal law since 1972. And almost nobody knows the rules until the day they need them, which is exactly the wrong day to learn them.

Here is the core of it. If you have end-stage renal disease, Medicare coverage usually cannot start until the fourth month of dialysis — unless you train for home dialysis, in which case it can begin in month one. If you also have employer coverage, that plan pays first for a 30-month coordination period. Since 2021 you have been able to choose a Medicare Advantage plan instead of Original Medicare. And as of September 1, 2025, Texas law gives under-65 ESRD patients a right to buy a Medicare Supplement policy that they simply did not have before.

How does kidney failure make you Medicare-eligible at any age?

End-stage renal disease — permanent kidney failure requiring either regular dialysis or a transplant — is one of three doorways into Medicare. The other two are turning 65 and receiving disability benefits for 24 months. ESRD is the only one with no age requirement at all.

You still need a connection to the Social Security system. Generally you qualify if you have enough work credits yourself, or if you are the spouse or dependent child of someone who does, or if you are already receiving Social Security or Railroad Retirement benefits. A child on a parent’s work record can qualify. This is why families are sometimes surprised to learn that a young adult on dialysis has a Medicare option at all.

Two things people commonly get wrong. First, ESRD eligibility is not automatic — someone has to file an application, and it does not happen by itself the way age-65 enrollment often does for people already drawing Social Security. Second, the eligibility is tied to the treatment, not to the diagnosis. Chronic kidney disease at stage 3 does not confer Medicare eligibility. Dialysis or a transplant does.

When does coverage actually start?

There are three different answers, and the difference between them can be thousands of dollars.

What if you already have employer coverage?

Then a 30-month clock starts, and understanding it prevents a specific and expensive mistake.

When you become eligible for Medicare because of ESRD, your group health plan remains the primary payer for a 30-month coordination period. Medicare pays second. This holds regardless of how many employees the company has, and regardless of whether the coverage is based on current employment — which is different from how coordination usually works at 65. The 30 months start the first month you would be eligible for Medicare because of kidney failure, typically the fourth month of dialysis, even if you have not signed up for Medicare yet.

That last clause is the trap. The clock runs whether or not you enrolled. Some people reasonably decide to delay Medicare while their employer plan is paying, then discover the coordination period has been quietly expiring in the background. When it ends, Medicare becomes primary — and if you are not enrolled, there is no primary payer.

If you are working and weighing how Medicare interacts with a job-based plan, the same instincts apply here as in our guide to how Medicare works with employer insurance, but the ESRD rules are their own animal. Do not assume the general advice transfers.

What does Medicare actually pay for dialysis?

Dialysis is a Part B service. That means, in Original Medicare, after you meet the annual Part B deductible, Medicare pays 80% of the approved amount and you are responsible for the remaining 20%.

For most Part B services, a 20% coinsurance is an annoyance. For a treatment delivered three times a week, every week, indefinitely, it is something else. And Original Medicare has no annual out-of-pocket maximum. There is no point in the year at which the 20% stops.

This is the entire reason supplemental coverage dominates the conversation for dialysis patients. The options are essentially: a Medicare Supplement policy, a Medicare Advantage plan with its own out-of-pocket cap, retiree or employer coverage, or Medicaid for those who qualify. Which one is right depends on your income, your providers, and your prognosis — and until recently, in Texas, one of those doors was mostly shut if you were under 65.

Can an ESRD patient choose a Medicare Advantage plan?

Yes — and this is a relatively recent change that a surprising number of people have not caught up with.

Before 2021, people with ESRD were generally barred from enrolling in Medicare Advantage plans, with narrow exceptions. The 21st Century Cures Act changed that. Since January 1, 2021, ESRD patients can enroll in Medicare Advantage on the same footing as everyone else.

The appeal is obvious: every Medicare Advantage plan has an annual out-of-pocket maximum, which Original Medicare lacks. The caution is equally real. Advantage plans manage care through networks and prior authorization, and dialysis is exactly the kind of ongoing, high-cost service where network adequacy and authorization practices matter enormously. Before choosing one, the questions are concrete: is my dialysis center in network, is my nephrologist in network, and if a transplant becomes part of the plan, which transplant centers are covered. Our overview of Medicare Advantage plans covers the general structure, and our piece on prior authorization rules in 2026 explains the approval mechanics.

What changed in Texas for under-65 patients?

For years this was the hardest conversation in the room. A 45-year-old on dialysis in Houston had Medicare, faced an uncapped 20% coinsurance, and in most cases could not buy a Medicare Supplement policy to cover it — because federal law only guarantees Medigap access during the six months after you turn 65 and enroll in Part B. Texas, like most states, offered under-65 beneficiaries only limited access, generally Plan A.

That changed with House Bill 2516, passed by the 89th Texas Legislature and known as the Chris Larkin ALS Act. Effective September 1, 2025, an insurer that offers Medicare Supplement policies to people 65 and older must offer the same coverage to Texans under 65 who are Medicare-eligible because of ESRD or ALS. The terms, as described in Texas Department of Insurance guidance and by the patient organizations that pushed for the bill:

• Plans A, B, and D at the same premium charged to a 65-year-old.
• All other plans capped at no more than 200% of the age-65 rate.
• No medical underwriting, no waiting period, and no pre-existing condition exclusion during the six-month enrollment window that begins with the first month of Part B enrollment.
• No denial or discrimination based on health status during that window.

The practical effect is large. For an under-65 dialysis patient in Harris County, the difference between an uncapped 20% coinsurance and a supplement that covers it is not a budgeting detail — it is the difference between coverage that works and coverage that technically exists. If you are weighing which plan letter fits, our guides to Medicare Supplement plans and Plan G versus Plan N lay out the differences, and high-deductible Medigap is worth understanding as a lower-premium alternative.

What happens after a transplant?

Medicare based on ESRD is not permanent. Here is how it winds down.

Put plainly, the two clocks that end coverage are:

• 12 months after the month you stop dialysis, or
• 36 months after the month of a successful kidney transplant.

If you become eligible another way in the meantime — you turn 65, or you qualify through disability — coverage continues on that basis. But for a 40-year-old whose transplant succeeds, Medicare has historically ended at month 37. And transplanted kidneys require immunosuppressive drugs indefinitely. Losing drug coverage has, in the past, cost people their transplants.

Congress addressed this. Beginning January 1, 2023, people whose ESRD-based Medicare ended 36 months after a successful transplant may be eligible for the Medicare Part B Immunosuppressive Drug benefit. It is a narrow benefit — it covers immunosuppressive drugs only, not doctor visits, not hospital care, not anything else. It is not a substitute for comprehensive coverage. But it closes the specific gap that used to put transplants at risk, and it is worth knowing about well before month 36 arrives.

Why does this land so hard in Harris County?

Because the upstream conditions are common here. Diabetes and high blood pressure are the two leading causes of kidney failure in the United States, and both are widespread across the Houston area.

Those prevalence figures come from CDC PLACES model-based estimates built on 2023 survey data, with 95% confidence intervals of 11.6%–15.0% for diabetes and 29.8%–35.8% for high blood pressure. The 475,000 figure is our own arithmetic — 13.2% applied to the county’s 3,595,915 adults — and should be read as an order of magnitude, not a headcount.

None of which is a prediction about any individual. Most people with diabetes never develop kidney failure. But at the population level, in a county this size, the arithmetic explains why every part of Houston has a dialysis center, and why the coverage rules above are not a niche topic.

Frequently asked questions

This article is for general educational purposes and reflects federal and Texas rules as of August 2026. Eligibility, coverage start dates, coordination of benefits, and Medicare Supplement availability depend on individual circumstances and can change. Wise Insurance Agency is an independent, Texas-licensed insurance agency; we are not affiliated with or endorsed by the federal Medicare program. Nothing here is medical advice — treatment decisions, including whether home dialysis is appropriate, belong with your nephrologist and care team.