If you have a pre-existing health condition, federal law gives you strong rights when buying ACA-compliant health insurance: an insurer cannot refuse to sell you a policy, cannot exclude coverage for your condition, and cannot charge you a higher premium because of it. Those protections are the heart of what people mean when they ask about pre-existing conditions and your rights. They do not, however, cover every insurance product on the market. Short-term health plans, life insurance, disability insurance, and long-term care insurance all still use medical underwriting, and Medicare supplement policies have their own separate rules. Knowing where each protection starts and stops is what keeps a gap from opening up when you need coverage most.
What Counts as a Pre-Existing Condition
A pre-existing condition is any health problem you had before the start date of a new insurance policy. Federal law reads the term broadly: any condition present before enrollment counts, whether or not you had a formal diagnosis, sought medical advice, or received treatment.1Office of the Law Revision Counsel. 42 USC 300gg-3 – Prohibition of Preexisting Condition Exclusions or Other Discrimination Based on Health Status Common examples include diabetes, asthma, heart disease, cancer, high blood pressure, sleep apnea, depression, and pregnancy. Before the Affordable Care Act, conditions that had been successfully treated years earlier could still trigger higher premiums or outright denial.
Outside ACA-compliant health insurance, the concept keeps its teeth. Life, disability, and long-term care insurers screen for pre-existing conditions using a look-back period, a window of time (often three to six months, sometimes longer) during which they examine your medical records, prescriptions, and doctor visits. Anything flagged in that window can shape your coverage terms.
Your Rights Under the Affordable Care Act
Three provisions of federal law work together to protect people with pre-existing conditions in ACA-compliant health insurance. Each does something distinct.
Guaranteed Issue
Under 42 U.S.C. § 300gg-1, every health insurer operating in the individual or group market must accept every applicant who applies.2GovInfo. 42 USC 300gg-1 – Guaranteed Availability of Coverage An insurer cannot reject your application because of your medical history. This rule applies whether you’re buying through the federal marketplace, a state exchange, or directly from an insurer.
No Pre-Existing Condition Exclusions
Under 42 U.S.C. § 300gg-3, group health plans and insurers selling individual or group coverage cannot impose any pre-existing condition exclusion.1Office of the Law Revision Counsel. 42 USC 300gg-3 – Prohibition of Preexisting Condition Exclusions or Other Discrimination Based on Health Status An insurer cannot refuse to cover a treatment, medication, or service because the underlying condition existed before your policy started. Before this law, a person with a cancer history might have bought a plan that explicitly excluded cancer treatment, leaving them to pay out of pocket if the disease returned.
Limits on What Changes Your Premium
Even guaranteed coverage would be hollow if insurers could price sick people out of the market. Under 42 U.S.C. § 300gg, premiums in the individual and small group markets can vary based on only four factors: whether the plan covers an individual or family, the geographic rating area, age (capped at a 3-to-1 ratio for adults), and tobacco use (capped at 1.5-to-1).3Office of the Law Revision Counsel. 42 USC 300gg – Fair Health Insurance Premiums Health status, medical history, gender, and claims history are all off the table. A person managing a chronic illness pays the same premium as a healthy person of the same age in the same area with the same tobacco status.
Pregnancy Is Fully Covered From Day One
Pregnancy cannot be treated as a pre-existing condition under any ACA-compliant plan. An insurer cannot reject your application or charge more because you are pregnant when you enroll.4HealthCare.gov. Marketplace Health Plans Cover Pre-Existing Conditions Maternity and newborn care are one of the ten categories of essential health benefits every qualified plan must include.5Office of the Law Revision Counsel. 42 USC 18022 – Essential Health Benefits Requirements Coverage starts the day your plan starts, with no waiting period for pregnancy-related services.
You Still Have to Enroll at the Right Time
The right to be accepted doesn’t mean you can sign up on any day of the year. ACA marketplace plans have an annual open enrollment period running from November 1 through January 15.6HealthCare.gov. Getting Health Coverage Outside Open Enrollment Outside that window, you can enroll only if you qualify for a special enrollment period, which is triggered by life events like losing other coverage, getting married, having a baby, or moving to a new area.
This is where people with pre-existing conditions sometimes get stuck. The law guarantees that no insurer can turn you away, but if you miss open enrollment without a qualifying event, you may wait months before the next window opens. Losing employer coverage, aging off a parent’s plan, and becoming newly eligible for marketplace subsidies all create special enrollment rights, typically lasting 60 days from the triggering event.
Health Plans That Don’t Have to Follow These Rules
Not every health product is subject to the ACA’s pre-existing condition protections. Several categories are legally exempt, and the differences matter.
Grandfathered Plans
A grandfathered plan is one that was in effect on or before March 23, 2010, and has not made substantial changes to its benefits or cost-sharing since.7Federal Register. Interim Final Rules for Group Health Plans and Health Insurance Coverage Relating to Status as a Grandfathered Health Plan These plans may still exclude pre-existing conditions, and they aren’t required to cover preventive care at no cost.4HealthCare.gov. Marketplace Health Plans Cover Pre-Existing Conditions A plan loses that status if it eliminates most benefits for treating a particular condition or raises fixed cost-sharing beyond a threshold tied to medical inflation plus 15 percentage points. If you’re in a grandfathered plan, confirm in writing whether it carries any pre-existing condition restrictions.
Short-Term Health Insurance
Short-term, limited-duration insurance is excluded from the federal definition of individual health insurance coverage, so it isn’t subject to the ban on pre-existing condition exclusions, health-status discrimination, or essential health benefits.8Centers for Medicare & Medicaid Services. Short-Term, Limited-Duration Insurance and Independent, Noncoordinated Excepted Benefits Coverage (CMS-9904-F) Fact Sheet Insurers selling these policies use medical underwriting routinely, and they can deny your application, exclude specific conditions, or charge more based on your health.
How long a short-term policy can run is in flux. A 2024 federal rule limited them to an initial term of three months and a total of four months with renewals.9Federal Register. Short-Term, Limited-Duration Insurance and Independent, Noncoordinated Excepted Benefits Coverage In August 2025, the Departments of Labor, HHS, and Treasury announced they would not prioritize enforcement of those duration limits. Some states cap short-term plan durations independently or ban them entirely, so the rules in your area depend on both federal enforcement and state law. If you have any ongoing health issue, read the policy’s exclusions line by line before signing.
Fixed Indemnity and Other Excepted Benefits
Fixed indemnity plans pay a flat dollar amount per day of hospitalization or per covered event rather than covering actual medical costs. Federal law classifies them as “excepted benefits,” which means they aren’t subject to the ACA’s ban on health-status discrimination or pre-existing condition rules. Hospital indemnity, accident-only, and similar supplemental products sit in the same category. They can plug gaps, but they are not a substitute for comprehensive health insurance, and they may refuse to pay benefits related to conditions you had before enrollment.
Medicare and Medigap
Medicare itself does not deny coverage or charge more because of pre-existing conditions. Once you’re eligible for Medicare Parts A and B, your conditions are covered from day one. Medicare Advantage (Part C) and Part D prescription drug plans also can’t deny enrollment or limit benefits based on health status.
Medigap is the piece worth special attention. These policies, sold by private insurers to fill gaps in Original Medicare, come with a six-month open enrollment window that starts when you’re 65 or older and first enrolled in Medicare Part B. During that window, any Medigap insurer must sell you any policy it offers at the standard price, regardless of your health. Buy outside that window, and insurers in most states can use medical underwriting, charge more, or deny you based on pre-existing conditions. Even when they do sell you a policy, federal law lets them impose a waiting period of up to six months during which they won’t cover expenses tied to conditions treated or diagnosed in the six months before coverage began.
Prior creditable coverage shortens that waiting period. If you had at least six continuous months of health coverage before your Medigap policy starts, with no gap longer than 63 days, the insurer must cover your pre-existing conditions right away. Each month of prior creditable coverage knocks a month off the waiting period. Don’t let coverage lapse before buying Medigap, and sign up during your initial window whenever you can.
Life, Disability, and Long-Term Care Insurance
Outside health insurance, pre-existing conditions remain a central underwriting factor. Life insurers, disability insurers, and long-term care carriers all use medical underwriting. The ACA’s protections do not reach these products.
Life Insurance
When you apply, the insurer reviews your medical records, may require a physical exam, and checks a shared database maintained by MIB Group (formerly the Medical Information Bureau). MIB stores coded information reported by member insurance companies when you apply for individually underwritten life or health insurance, covering medical conditions, hazardous occupations, and other risk factors from the prior seven years.10MIB Group. Request Your MIB Consumer File Insurers can’t base underwriting on MIB data alone, but gaps between your application and your MIB file will prompt follow-up.
If the insurer identifies a pre-existing condition, it may use a table rating system that adds roughly 25 percent per table level above the standard rate, up to Table 10 (a 250 percent increase). It can also attach a rider excluding a specific condition from the policy’s death benefit, or decline the application outright. You can request your MIB file for free once a year to check its accuracy before applying.10MIB Group. Request Your MIB Consumer File
Disability Insurance
Disability policies typically define a pre-existing condition using two windows. The look-back period is the span before your coverage starts (often three to six months for group plans, up to twelve months for individual policies) during which the insurer checks for treatment, diagnosis, or symptoms. The exclusion period is the span after coverage begins (commonly twelve to twenty-four months) during which the policy won’t pay benefits for disabilities tied to those flagged conditions. Once the exclusion period ends, the condition is usually covered going forward in group plans. Individual disability policies sometimes impose permanent exclusions on specific conditions through riders.
Long-Term Care Insurance
Long-term care insurers use a look-back period, commonly six months, to identify pre-existing conditions. If you received treatment during that window, the policy may exclude related care during an initial exclusion period. These policies are regulated primarily at the state level, so look-back duration and exclusion rules vary. Some carriers will sell to someone with a pre-existing condition but carve out related care; others will decline the application if the condition suggests a near-term need for services.
Genetic Information
The Genetic Information Nondiscrimination Act (GINA) bars health insurers from using genetic information, including family medical history and genetic test results, to deny coverage or set premiums. GINA does not extend to life, disability, or long-term care insurance. Carriers in those markets can ask about family medical history and, in some cases, use genetic test results in underwriting. If you’ve had genetic testing that showed elevated risk, know that sharing those results on an application for non-health coverage could affect your terms.
If a Health Insurer Denies You Anyway
If an ACA-compliant plan denies a claim or restricts coverage in a way that looks like a pre-existing condition exclusion, you have a structured path. The process has two stages: an internal appeal with the insurer, and an external review by an independent organization.
You have 180 days from the denial notice to file the internal appeal. Appeals are generally written, though urgent situations allow oral filing. The insurer must decide within 30 days for pre-service claims (like prior authorizations), 60 days for post-service claims, and as little as 72 hours for urgent care.11HealthCare.gov. How to Appeal an Insurance Company Decision You have the right to review all the evidence the insurer considered and to submit your own supporting documentation. The person reviewing your appeal cannot be the person who issued the original denial.
If the internal appeal doesn’t go your way, you can request external review within at least four months of the final denial. An independent review organization examines the decision, and its ruling binds the insurer. The federal external review process cannot charge you any fees. If a standard timeline would jeopardize your health, you can request an expedited external review at the same time you file an expedited internal appeal. You can also file a complaint with your state’s department of insurance at any point, which opens a separate regulatory inquiry into the insurer’s conduct.