About half of non-elderly Americans have some kind of pre-existing condition — diabetes, asthma, cancer history, depression, even pregnancy. Before 2014, any of these could mean being turned down for coverage. Today you have strong protections — as long as you know which kinds of coverage they apply to.
Key takeaways
- Marketplace plans, employer plans, Medicaid and CHIP can’t deny you, charge more or exclude a pre-existing condition.
- ACA plans can only vary premiums by age, location, tobacco use and family size.
- Short-term plans, fixed indemnity plans and health sharing ministries can still exclude pre-existing conditions.
- Medigap can use medical underwriting outside your open enrollment window in most states.
What counts as a pre-existing condition?
Any health problem you had before your coverage starts: chronic conditions like diabetes, heart disease or asthma; past cancer; mental health conditions; pregnancy; and many others.
Where you’re protected
| Type of coverage | Can deny or exclude for health history? |
|---|---|
| Marketplace / individual ACA plans | ❌ No |
| Employer plans | ❌ No |
| Medicaid & CHIP | ❌ No |
| Medicare (Parts A, B, D, Advantage) | ❌ No |
| Medigap | ⚠️ Yes in most states, outside your 6-month open enrollment |
| Short-term plans | ⚠️ Yes |
| Health care sharing ministries | ⚠️ Yes — and they aren’t insurance |
What ACA plans must do
- Accept you regardless of health status (during open enrollment or a Special Enrollment Period).
- Cover treatment for your condition from day one — no waiting periods.
- Charge you the same as a healthy person of your age, location and tobacco status.
- Not set annual or lifetime dollar limits on essential health benefits.
Tips if you have an ongoing condition
- Check networks first. Make sure your specialists and preferred hospital are in network.
- Check the formulary. Confirm your medications are covered and at what tier.
- Consider total cost. A Gold plan with a lower deductible often costs less overall for regular care. See metal tiers.
- Avoid coverage gaps. You can only enroll in ACA plans during open enrollment or after a qualifying event.
- Turning 65? Use your Medigap open enrollment window to lock in coverage without health questions. See Advantage vs. Medigap.
Frequently asked questions
Can I be charged more for smoking?
Yes. ACA plans can charge tobacco users up to 50% more in many states, though some states limit or ban this surcharge.
Is pregnancy a pre-existing condition?
It can be, but ACA plans must cover maternity care even if you were pregnant before enrolling. See pregnancy and health insurance.
Will my rates go up after I file claims?
Not individually. ACA plan premiums are set for everyone in a rating area, not based on your claims. Overall rates can rise each year for everyone.
Can life insurance or long-term care insurance consider my health?
Yes. These aren’t health insurance, so the ACA’s protections don’t apply. See long-term care insurance.
Sources: HealthCare.gov (“Coverage for pre-existing conditions”); HHS; Medicare.gov. For education only — not insurance advice. Last reviewed October 2026.
