Preventive care is any health service designed to catch or prevent disease before you have symptoms. Under the Affordable Care Act, most health insurance plans must cover a defined set of preventive services at no cost to you, meaning no copay, no deductible, and no coinsurance. The list is extensive, covering everything from blood pressure checks and cancer screenings to vaccines and contraception.
How the ACA Defines Preventive Care
The ACA requires private health insurance to cover preventive services that fall into four categories, each maintained by a different expert body:
- Adult screenings and counseling that receive a top-tier rating from the U.S. Preventive Services Task Force (USPSTF)
- Vaccines recommended by the CDC’s Advisory Committee on Immunization Practices for routine use
- Children’s and adolescent services outlined in guidelines from the Health Resources and Services Administration (HRSA)
- Women’s preventive services also guided by HRSA
These recommendations are updated regularly, and insurers are required to adopt changes within a set timeframe. If a service carries the right recommendation, your plan covers it at zero cost-sharing when delivered by an in-network provider.
Screenings Covered for Adults
Routine screenings form the backbone of preventive care. Blood pressure screening is recommended for all adults starting at age 18. Screening for prediabetes and type 2 diabetes is recommended for adults aged 35 to 70 who have overweight or obesity. These are the kinds of checks that happen during a standard annual physical, and they’re fully covered as long as you don’t have symptoms prompting the test.
Cancer screenings follow specific age-based schedules. Colorectal cancer screening is now recommended starting at age 45 and continuing through age 75. You have several options: a stool-based test done every year, a stool DNA test every three years, or a colonoscopy every 10 years for people at average risk. In a notable update finalized in 2024, the USPSTF now recommends that all women begin biennial (every two years) screening mammograms at age 40 and continue through age 74. Previously, women in their 40s were told to make an individual decision with their doctor about when to start. That’s no longer the case: 40 is now the standard starting point.
Cervical cancer screening, lung cancer screening for long-term smokers, and screening for hepatitis B and C also carry top-tier recommendations and are covered without cost-sharing.
Vaccines Covered at No Cost
All vaccines on the CDC’s recommended immunization schedule are considered preventive care. For adults, this includes a Tdap booster (tetanus, diphtheria, and pertussis) with a booster every 10 years, the annual flu shot, and COVID-19 vaccines. The shingles vaccine (a two-dose series) is recommended starting at age 50. Pneumococcal vaccines are recommended at various ages depending on risk factors, and universally for adults 65 and older.
If a vaccine is on the CDC schedule and appropriate for your age and health profile, your insurer covers it. This applies whether you get it at your doctor’s office or a pharmacy.
Women’s Preventive Services
Women have a separate, broader set of covered preventive services beyond what applies to all adults. HRSA guidelines recommend at least one well-woman preventive visit per year, starting in adolescence and continuing throughout life. These visits serve as the hub for delivering age-appropriate screenings, preconception counseling, prenatal care, and postpartum follow-up. The services can be spread across multiple visits rather than crammed into a single appointment.
Contraceptive care is fully covered, including screening, education, counseling, and the provision of all FDA-approved contraceptive methods. That extends to follow-up care like IUD removal or switching methods, as well as sterilization procedures. Gestational diabetes screening is covered for pregnant women, ideally between 24 and 28 weeks of gestation. Women with risk factors for type 2 diabetes are recommended to be screened earlier, at the first prenatal visit.
Breastfeeding support, domestic violence screening, and HPV testing are also part of the women’s preventive services package.
Children’s Preventive Care
For infants, children, and adolescents, preventive care includes well-child visits at regular intervals, developmental screenings, vision and hearing tests, immunizations on the childhood schedule, and behavioral health assessments. Obesity screening and counseling, fluoride varnish for dental health, and screening for conditions like lead exposure and autism are also covered. These services follow HRSA-supported guidelines and are designed to catch developmental or health issues early, when intervention is most effective.
When Preventive Becomes Diagnostic
This is the distinction that catches most people off guard. The same exact procedure can be billed as preventive or diagnostic depending on why it’s performed. A mammogram scheduled as part of routine screening for a woman with no symptoms is preventive, and covered at $0. A mammogram ordered because you found a lump is diagnostic, and your normal cost-sharing (copays, deductible) applies.
The same logic applies to colonoscopies, bloodwork, and most other tests. If you go in for a preventive visit and mention new symptoms or discuss a chronic condition, your provider may bill part of the visit as diagnostic. That separate charge can carry out-of-pocket costs. This doesn’t mean you should avoid mentioning symptoms. It just helps to understand that a single appointment can generate both a preventive and a diagnostic bill.
The trigger is clinical context. A test ordered because you’re the right age and have no symptoms is preventive. A test ordered because something is wrong, or because a previous result was abnormal, is diagnostic.
Plans That Don’t Have to Comply
Not every insurance plan is required to cover preventive care at no cost. Grandfathered health plans, those that existed before the ACA was signed in March 2010 and haven’t made significant changes since, are exempt from the free preventive care requirement. If your plan is grandfathered, you may still owe copays or coinsurance for services that would otherwise be $0.
Short-term health plans and health-sharing ministries are also not bound by ACA preventive care rules. You can check whether your plan is grandfathered by looking at your plan documents or calling your insurer directly. If you’re on a Marketplace plan or any non-grandfathered employer plan, the full preventive care benefit applies.
Common Preventive Services at a Glance
- Blood pressure screening: all adults 18 and older
- Diabetes screening: adults 35 to 70 with overweight or obesity
- Mammograms: every two years, ages 40 to 74
- Colorectal cancer screening: ages 45 to 75
- Shingles vaccine: two doses starting at age 50
- Tdap booster: every 10 years
- Annual flu shot: all adults
- Well-woman visits: at least once per year
- Contraception: all FDA-approved methods, including counseling
- Well-child visits: on a regular schedule from birth through adolescence
The full, searchable list of covered services is maintained on the USPSTF website and at HealthCare.gov. If you’re unsure whether a specific service qualifies, checking against these lists before your appointment can save you a surprise bill.