When Does ACA Open Enrollment Start in Bexar County, Texas?

The standard window and what to have ready

Open Enrollment for ACA Marketplace plans in Bexar County runs November 1 into January each year, the same dates as everywhere else in Texas, with coverage typically starting January 1 for applications submitted by mid-December. Note: a 2026 court ruling that would end Open Enrollment on December 15 is under appeal, so confirm the current closing date on HealthCare.gov. If enrollment is open past mid-December, enrolling in that later stretch typically pushes your effective date to February 1 instead. Before starting your application in Bexar County, have your household's estimated 2026 income, Social Security numbers for everyone being covered, and a list of current doctors and medications on hand.

Why re-shopping every year matters here. If you don't actively make changes during Open Enrollment, most plans auto-renew into a similar plan for the following year, which can quietly cost you money if your income, subsidy amount, or the plan's premium changed. San Antonio-area ACA Marketplace shoppers can typically choose from several major carriers, including CHRISTUS Health Plan, a regionally rooted insurer with a strong local hospital network. That level of choice means re-shopping in Bexar County each year, rather than letting a plan auto-renew, is especially likely to turn up a better option.

Getting help with enrollment. A licensed agent serving Bexar County costs nothing extra to work with — agents are paid by the carrier, not by you — and can compare plans across carriers rather than relying on the Marketplace's own comparison tool alone. Enrolling earlier in the window, rather than waiting until the final deadline, also gives more time to fix any application errors.

What changes year to year. Premiums, subsidy amounts, plan networks, and even which carriers participate in Bexar County can all change from one year to the next, which is exactly why re-shopping during each Open Enrollment period, rather than assuming continuity, tends to save money.

What happens after you enroll

Once you submit your application in Bexar County, you'll typically receive a confirmation and your first premium invoice within a few weeks. Paying that first invoice is what actually activates your coverage, so don't assume enrollment alone guarantees your plan is active on January 1.

State vs. federal marketplace. Texas uses the federal HealthCare.gov Marketplace rather than running its own state exchange, so all enrollment, whether done directly or through a licensed agent, ultimately routes through the same federal system and the same window.

If your income changes mid-year. If your income changes significantly after enrolling in Bexar County — a raise, a job loss, a new side income — report it through your Marketplace account as soon as possible. This adjusts your subsidy in real time and helps you avoid an unexpected bill or refund when you file taxes the following year.

Confirming your enrollment went through. After enrolling in Bexar County, log back into your HealthCare.gov account or check with your agent a few days later to confirm the application processed correctly — catching an error early, before your coverage start date, is far easier to fix than after.

One more thing to keep in mind

Setting a personal reminder for November 1 each year is a simple way for Bexar County residents to never default into an outdated auto-renewed plan by accident.

Related reading. Medicare enrollment in Bexar County follows a separate calendar entirely — October 15 through December 7 — distinct from the ACA Marketplace window described above.

Local context for Bexar County

Bexar County's economy is shaped heavily by military installations, healthcare systems, and tourism, giving San Antonio a mix of large institutional employers and a strong small-business sector.

San Antonio's hospital landscape includes University Health (the county's public hospital system, tied to UT Health San Antonio) and Baptist Health System. As one of Texas's largest counties, Bexar County gives Marketplace shoppers a wider choice of insurer networks and in-network hospital systems than most of the state. Enrollment help is often available locally, including through patient-navigator programs connected to University Health, in addition to the statewide options below.

How Bexar County fits Texas's wider market. Statewide, Texas insurers raised individual Marketplace premiums by an average of 34.7% for 2026. That number lands very differently depending on subsidy eligibility: roughly 92% of enrollees get a premium tax credit, averaging around $650 a month, that offsets much of the hike, while households above the 400% federal poverty level cliff, now back in force, receive no credit whatsoever.

Where Texas's rules diverge from most states. Since Texas hasn't expanded Medicaid, adults in Bexar County without dependent children or a qualifying disability generally have no path to Medicaid at any income. An estimated 570,000 to 617,000 Texans statewide are thought to fall into that gap. Children can often still get CHIP even when a parent qualifies for nothing, and applications for both go through Your Texas Benefits (yourtexasbenefits.com) instead of HealthCare.gov.

What to have ready before requesting a quote. County averages only go so far; they're not a personalized number. What actually drives your premium in Bexar County is your specific ZIP code, the ages of each covered person, your household income for the year, and the providers and prescriptions you need covered. Pulling those together beforehand keeps a quote conversation short, and a licensed Texas agent can run the numbers for free, since the carrier, not you, pays their commission.