Does Health Insurance Cover Pre-Existing Conditions? 2026

If you have diabetes, a cancer history, asthma, or a mental health condition, you may worry that insurers can turn you away. Here is what the law actually says in 2026.

What Counts as a Pre-Existing Condition?

A pre-existing condition is any health problem you had before your new coverage started. According to HealthCare.gov, insurers on ACA plans cannot use any of these against you.

Common examples include:

• Diabetes (Type 1 and Type 2)
• Cancer or a history of cancer
• Asthma and other chronic respiratory conditions
• Heart disease and high blood pressure
• Mental health conditions such as depression or anxiety
• Pregnancy before you enroll

Before the ACA, the Centers for Medicare & Medicaid Services (CMS) noted that an insurer could deny coverage or impose long exclusion periods for these conditions. That practice is no longer permitted on compliant plans.

How the ACA Protects You

The ACA bars ACA-compliant plans from "medical underwriting" based on health status. That means your premium is set by factors like age, location, and tobacco use, not by your diagnosis.

| Insurer Action | ACA Marketplace & Most Employer Plans | Short-Term / Non-ACA Plans | | --- | --- | --- | | Deny you for a pre-existing condition | Not allowed | Often allowed | | Charge a higher premium for it | Not allowed | Often allowed | | Refuse to cover related treatment | Not allowed | Often allowed | | Impose a waiting period for it | Not allowed | Often allowed |

The one factor that can still raise your premium on an ACA plan is tobacco use, which CMS allows insurers to surcharge by up to 50 percent in many states. Your health history itself cannot. For a full breakdown of what services are included, see our guide on what health insurance covers.

Pregnancy Is Always Covered

Pregnancy and maternity care are one of the 10 essential health benefits required on every ACA-compliant plan. Per HealthCare.gov, this is true even if you are already pregnant when you apply, because pregnancy cannot be treated as a pre-existing condition that blocks coverage.

That coverage includes:

• Prenatal visits and screenings
• Labor and delivery (hospital or birth center)
• Newborn care in the first days of life
• Breastfeeding support and equipment

You can enroll in or change a marketplace plan during Open Enrollment, or sooner if you qualify for a Special Enrollment Period. Learn more in our ACA marketplace guide.

The Big Exception: Short-Term Plans

Short-term, limited-duration plans are designed as temporary gap coverage and are not ACA-compliant. CMS confirms these plans are exempt from pre-existing condition protections, so they can:

• Reject your application based on health history
• Exclude any condition you already have from coverage
• Charge more or cap benefits

Other non-ACA arrangements, such as some health care sharing ministries and certain fixed-indemnity products, may carry similar gaps. Before you buy, confirm the plan is ACA-compliant.

How to verify a plan is ACA-compliant:

1. Shop on the official marketplace at HealthCare.gov or your state exchange, where all plans qualify.
2. Look for the 10 essential health benefits listed in the plan documents.
3. Confirm there is no medical underwriting application asking detailed health questions.
4. Check that the plan does not call itself "short-term" or "limited-duration."

Comparing compliant options carefully is the surest way to keep these protections. Our walkthrough on how to choose health insurance can help you weigh plans side by side.

Frequently Asked Questions

Can a health insurance plan deny me for a pre-existing condition in 2026? No. ACA-compliant marketplace and most employer plans cannot deny coverage, charge more, or exclude treatment because of a pre-existing condition.

Is there a waiting period for pre-existing conditions? No. ACA-compliant plans cover pre-existing conditions immediately, with no waiting period before treatment for that condition is covered.

Are short-term health plans allowed to deny pre-existing conditions? Yes. Short-term and other non-ACA plans are exempt from these rules and can deny, exclude, or charge more for pre-existing conditions.

Sources: HealthCare.gov, Centers for Medicare & Medicaid Services (CMS)