Does ACA Insurance Cover Preventive Care 100%? (2026)

Direct Answer

Yes, but only for a defined list of services. Non-grandfathered ACA plans, including Marketplace and most employer plans, must cover USPSTF A/B-rated screenings, ACIP-recommended vaccines, and HRSA women's and children's preventive guidelines at zero cost-sharing, but only in-network. Grandfathered plans and short-term insurance are exempt. The 2025 Kennedy v. Braidwood ruling upheld this mandate for 2026.

What the ACA Preventive Services Mandate Actually Requires in 2026

Section 2713 of the Public Health Service Act, added by the ACA and implemented at 45 CFR 147.130, requires every non-grandfathered group and individual health plan to cover four categories of preventive services without any copay, coinsurance, or deductible: services rated A or B by the U.S. Preventive Services Task Force (USPSTF), vaccines recommended by the CDC's Advisory Committee on Immunization Practices (ACIP), preventive care for infants, children, and adolescents supported by the Health Resources and Services Administration (HRSA) under the Bright Futures guidelines, and additional women's preventive services also set by HRSA, including contraception and well-woman visits.

In June 2025, the Supreme Court decided Kennedy v. Braidwood Management, a 6-3 ruling that rejected a constitutional challenge to how USPSTF members are appointed. The Court held that Task Force members are inferior officers because the HHS Secretary can remove them at will and review their recommendations before they take effect, so the panel's structure does not violate the Appointments Clause. This preserved zero-cost preventive coverage for the roughly 100 million Americans with private insurance in 2026, though a separate procedural challenge over HRSA and ACIP recommendation ratification continues in lower courts. Like the ACA's guaranteed-issue protection for a preexisting condition, the preventive mandate applies regardless of health status, so a plan cannot charge more or deny a preventive service because of a prior diagnosis.

Which Preventive Services Are Covered at 100% in 2026

The full list runs to more than 100 items and updates whenever USPSTF, ACIP, or HRSA revise a recommendation, but the most commonly used 2026 no-cost preventive services include:

• Cancer screenings: mammograms (ages 40+), cervical cancer screening (Pap/HPV test), colorectal cancer screening (ages 45-75, including screening colonoscopy or stool-based tests), and low-dose CT lung cancer screening for eligible current and former smokers.
• All ACIP-recommended immunizations, including flu, COVID-19, Tdap, shingles, and the HPV vaccine series.
• Well-woman visits, all FDA-approved contraceptive methods (with a narrow religious/moral exemption for some employers), and prenatal screenings.
• Chronic disease screenings: blood pressure, cholesterol, type 2 diabetes (adults 35-70 who are overweight or obese), depression, and statin use for adults at elevated cardiovascular risk.
• HIV screening for people ages 15-65, and pre-exposure prophylaxis (PrEP) medication and related monitoring for people at risk.
• Well-child visits and the full Bright Futures schedule through age 21, including developmental, hearing, and vision screenings.
• Tobacco use screening and cessation counseling or medication, and obesity screening with intensive behavioral counseling.

Which Plans Must Comply, and Which Don't, in 2026

ACA Marketplace plans and most employer-sponsored plans must comply because the ACA-compliant category includes any plan issued or materially changed after March 23, 2010. Grandfathered plans, meaning coverage that has existed since before that date without substantial cuts to benefits or increases to cost-sharing, are legally exempt from the preventive services mandate. A shrinking share of employer plans still hold grandfathered status, and any benefit change can strip that status and trigger the mandate going forward.

Short-term, limited-duration insurance (STLDI) is not ACA-compliant at all and is not required to cover preventive care; whatever benefits it offers are set entirely by the individual insurer. High-deductible health plans (HDHPs) paired with a Health Savings Account (HSA) are ACA-compliant and must cover the same preventive list at $0, which is also required by IRS rules so that preventive care can be paid before the deductible without disqualifying HSA eligibility.

When You Might Still Get a Bill for 'Preventive' Care

Three situations commonly turn a supposedly free visit into a bill. First, out-of-network care: the $0 mandate applies only when you see an in-network provider, so an out-of-network mammogram or annual physical can generate full cost-sharing. Second, a screening that becomes diagnostic: if a screening colonoscopy finds and removes a polyp, some plans historically billed the removal as a separate diagnostic procedure, though federal guidance since 2022 (FAQs About Affordable Care Act Implementation Part 51) clarified that a follow-up colonoscopy after a positive at-home stool test must also be covered at $0 as part of the preventive benefit. Third, add-on services: your provider may bill separately for tests or counseling that are not on the USPSTF/ACIP/HRSA list, even during the same visit.

If you receive a bill for something you believe should have been free, request an itemized bill and the Explanation of Benefits (EOB) from your insurer, check the billing codes against the current USPSTF A/B list at healthcare.gov, and file an internal appeal citing 45 CFR 147.130 before paying. A bill analyzer tool can flag whether the charges match a covered preventive code.

Cost of Preventive Services Without Insurance in 2026

The value of the ACA preventive mandate becomes clear against self-pay pricing. These are typical 2026 cash-pay ranges reported by FAIR Health and provider fee schedules for someone without ACA-compliant coverage:

How Medicare and Medicaid Handle Preventive Care

Original Medicare Part B covers a similar but separately defined list of preventive services at $0 coinsurance when the provider accepts Medicare assignment, including the Annual Wellness Visit, cancer screenings, flu and COVID-19 vaccines, and cardiovascular disease screening. Medicare Part A, by contrast, only pays for inpatient hospital stays and does not cover outpatient preventive visits at all, and Medicare Part D drug plans cover many vaccines filled at a pharmacy but not the clinic-administered shots that fall under Part B. This is a CMS-administered list, not the ACA private-plan mandate, so a service covered under one may not automatically be covered under the other. Medicare Advantage plans must cover at least everything Original Medicare covers and often add extra preventive perks like fitness benefits; Medigap policies do not add preventive coverage since Original Medicare already charges $0 coinsurance for these services.

Medicaid expansion states must cover ACA Essential Health Benefit preventive services for adults with no cost-sharing under the Alternative Benefit Plan structure, and all state Medicaid programs must provide EPSDT (Early and Periodic Screening, Diagnostic, and Treatment) preventive services at no cost for enrollees under 21. About 12 million dual-eligible Americans who have both Medicare and Medicaid get the broadest combined preventive benefit of any coverage type in 2026.

Does ACA insurance cover annual physicals at 100%?

It depends on the visit type. ACA plans must cover the specific USPSTF-recommended screenings and counseling that happen during a wellness visit at $0. If your doctor also treats a new symptom or existing condition during the same appointment, that portion can be billed as a regular office visit with normal cost-sharing.

Does ACA cover birth control at no cost?

Yes. All FDA-approved contraceptive methods for women are covered at $0 under the HRSA women's preventive services guidelines, including IUDs, implants, and oral contraceptives. A narrow religious or moral exemption lets some employers opt out of covering contraception directly, in which case the insurer or a separate accommodation must still provide it.

What preventive services are not covered at 100% under ACA plans?

Services without an A or B rating from USPSTF, services outside the ACIP and HRSA lists, and any diagnostic follow-up beyond what federal guidance requires can still involve cost-sharing. Out-of-network preventive care and services from a grandfathered plan also fall outside the $0 mandate.

Does the ACA preventive care mandate still apply in 2026 after the Supreme Court ruling?

Yes. The Supreme Court's June 2025 decision in Kennedy v. Braidwood Management upheld the mandate's constitutionality in a 6-3 ruling, so the USPSTF A/B, ACIP, and HRSA preventive coverage requirements remain in effect for 2026. A separate, narrower procedural challenge continues in lower courts but has not changed coverage for 2026.

Do grandfathered health plans have to cover preventive care for free?

No. Grandfathered plans, meaning coverage that has existed unchanged since before March 23, 2010, are legally exempt from the ACA preventive services mandate. Some still offer free preventive benefits voluntarily, but they are not required to. Any substantial benefit cut or cost-sharing increase strips grandfathered status and triggers the mandate.

Does Medicare cover preventive care the same way as ACA plans?

Not identically. Original Medicare Part B covers a CMS-defined list of preventive services at $0 coinsurance, including the Annual Wellness Visit and major cancer screenings, when the provider accepts Medicare assignment. The list overlaps heavily with USPSTF A/B services but is administered separately from the ACA private-plan mandate.

Why did I get billed for a 'preventive' colonoscopy?

If your doctor removed a polyp during a screening colonoscopy, the procedure can shift from preventive to diagnostic coding, though federal guidance since 2022 requires $0 cost-sharing for a follow-up colonoscopy after a positive at-home stool test. Request the billing codes and file an appeal citing 45 CFR 147.130 if you believe the charge was miscoded.

Does short-term health insurance cover preventive care?

Usually not, or only partially. Short-term, limited-duration insurance (STLDI) is not ACA-compliant and is not required to cover the preventive services list. Any preventive benefits are set entirely by the individual insurer's policy terms, so coverage varies widely and is often thinner than an ACA-compliant plan.