Short-term health insurance is the cheap-looking option a lot of people see while searching for coverage. The premiums are real, and they really are lower than ACA marketplace plans. But the reason they are lower is structural, and it shows up at the worst possible time.
I am not against short-term plans in every case. There are narrow situations where they make sense. I am very against people buying them without understanding what they signed up for.
What a short-term plan is
A short-term, limited-duration health insurance plan is a medical insurance policy designed to last for a short period (typically less than a year, sometimes with renewals up to several years depending on federal rules in effect). They were originally created to bridge gaps between major medical plans.
The federal definition has moved between administrations. The Obama era set short-term plans at less than three months. The Trump first term extended them to less than 12 months with renewals up to 36 months total. The Biden administration tightened them. The current rule in your state controls.
Critically, short-term plans are not subject to the ACA core protections. That makes them cheaper and far more limited.
What short-term plans typically do not cover
The common exclusions and limitations include:
Pre-existing conditions. Most short-term plans can decline coverage entirely for applicants with a recent medical history, or accept the applicant but exclude any condition treated or diagnosed in the past several years. If you have asthma, diabetes, depression, a thyroid condition, or were treated for any chronic issue, this is the most likely deal-breaker.
Maternity care. Most short-term plans exclude maternity entirely. A pregnancy that begins during a short-term plan is generally not covered.
Mental health and substance use treatment. Often excluded or capped at very low limits.
Prescription drugs. Some short-term plans include limited drug coverage. Many do not, or limit it to discount cards.
Preventive care free of cost. The ACA requires marketplace plans to cover preventive care with no cost sharing in network. Short-term plans usually do not.
Caps on benefits. Short-term plans can have annual dollar caps (for example, $1 million per policy period) and per-service caps. The ACA banned dollar caps on essential health benefits in major medical plans. Short-term plans can re-introduce them.
No essential health benefits requirement. Short-term plans do not have to cover the ten ACA essential categories. Coverage of any of them is at the insurer discretion.
How "rescission" works
The most painful surprise is rescission. If you file a claim and the insurer discovers a condition you did not disclose, even if you genuinely forgot or did not know about it, the insurer can rescind the policy back to the start and not pay the claim.
Common rescission triggers:
A condition the applicant assumed was minor (occasional acid reflux, anxiety treated briefly, an old back injury).
A medication taken irregularly.
A diagnosis the applicant was not aware was on their chart.
The ACA banned rescission in major medical plans except for outright fraud. Short-term plans operate under different rules.
This is the structural risk that gets people hurt. They buy short-term because it is cheap, never have an incident, and like the plan. Then they have one ER visit, the insurer reviews medical records as part of underwriting the claim, finds a note from three years ago, and denies the claim. Now they have a six-figure hospital bill.
When short-term plans can make sense
Three narrow cases I have actually seen work out.
Case 1. Healthy 28-year-old, missed Open Enrollment by three weeks because of a move, will have employer coverage starting in three months. No chronic conditions, no medications, low-risk lifestyle. A short-term plan for the gap is reasonable. The risk is small and the alternative is going bare.
Case 2. Newlywed couple, one has marketplace coverage, the other will join their spouse plan at the spouse next Open Enrollment in eight months. The uninsured spouse needs a bridge. If healthy, a short-term plan can work, but read the exclusions on anything resembling a pre-existing condition.
Case 3. International transfer to the US arrived after Open Enrollment, will get employer coverage in two months. Short gap, healthy, low ongoing health needs.
In all three cases the deal works only if nothing actually happens. The plan is a coin flip with a low probability of catastrophe.
When short-term plans are usually a mistake
Anyone with a chronic condition. The exclusions will catch you.
Anyone planning a pregnancy in the next 12 months. Maternity is not covered.
Anyone needing ongoing prescriptions. Drug coverage is usually weak.
Someone using short-term as a multi-year strategy because marketplace plans seem expensive. The numbers may look better month to month, but a single catastrophic event can erase a decade of premium savings.
A young family. The risk profile for young kids includes things that short-term plans cover badly (developmental, mental health, ER visits, ongoing pediatric care).
People who qualify for ACA premium tax credits and skip the marketplace. Many people who buy short-term think they cannot afford marketplace. They never ran the numbers with their actual subsidy. Run the marketplace estimate first.
Alternatives to consider before buying short-term
Medicaid. Eligibility depends on state expansion status. If you might qualify, apply. Medicaid is year-round.
A marketplace plan with a premium tax credit. Use the HealthCare.gov estimator with realistic income. Many people are surprised by how low the subsidized premium is.
A 60-day Special Enrollment Period. If you have lost coverage or had another life event, you have a window to enroll in a marketplace plan. See our SEP guide.
A high-deductible marketplace plan plus an HSA. The premium is lower than other tiers and the HSA gives you a tax-advantaged buffer.
Catastrophic coverage on the marketplace. For under-30s or people with hardship exemptions, the catastrophic tier on the marketplace is cheaper than other marketplace tiers and still covers essential health benefits, unlike a short-term plan.
Healthcare sharing ministries are not insurance
While we are here: healthcare sharing ministries are explicitly not insurance. They are agreements among members to share costs. They are exempt from many state insurance laws, do not guarantee payment, and can refuse claims for moral or doctrinal reasons. They are sometimes priced like short-term plans, but with even less consumer protection. Treat them as an entirely separate category from anything regulated as insurance.
What to do next
Before buying any short-term plan:
Run the marketplace numbers with your real income. The HealthCare.gov estimator takes five minutes.
Check Medicaid eligibility through your state agency. It is free and year-round.
Read the policy documents. Specifically look for: exclusions list, pre-existing condition language, maternity language, prescription drug coverage, annual benefit cap, lifetime benefit cap.
If you still decide on a short-term plan, treat it like incomplete coverage. Avoid scheduling any care you can defer until you have a real plan.
See open enrollment deadlines and SEP qualifying life events for ways into marketplace coverage you may have missed.
Sources
Frequently asked questions
Are short-term plans the same as ACA marketplace plans?
No. Short-term plans are not required to cover essential health benefits, can deny applicants based on pre-existing conditions, and can rescind coverage if undisclosed conditions are found. They are regulated differently from marketplace plans.
Why are short-term plans cheaper?
They cover less. They can exclude pre-existing conditions, cap annual or lifetime benefits, exclude maternity, mental health, prescription drugs, and other categories that ACA plans cover.
How long can a short-term plan last?
It depends on federal and state rules. Federal rules have changed across administrations between roughly 90 days plus renewals up to a year and the older rule of less than 12 months. Some states impose tighter limits. Check current rules in your state.
Should I ever buy a short-term plan?
Sometimes. Short gaps for an otherwise healthy person who missed Open Enrollment and is not Medicaid-eligible can be a use case. For anyone with chronic conditions or unpredictable health needs, the risks usually outweigh the savings.
