If you've priced health coverage lately, you've probably noticed something tempting: short-term health insurance plans advertising premiums that look like a rounding error compared to a marketplace plan.
A healthy 30-year-old in many states can find one for under $100 a month.
It's a product built to attract people who are shopping on price, and the gap between what it costs and what it covers is where the real story lives.
These plans exist in a regulatory gray zone.
Under federal rules, they can last up to 364 days and be renewed for up to three years in many states, though some states cap them far shorter or ban them outright.
They don't have to cover pre-existing conditions, prescription drugs, maternity care, or mental health.
They can cap how much they'll pay out per year.
Search ads and broker sites push low deductibles and same-day approval.
What's buried in the fine print is a process called underwriting: answer one health question wrong, or develop a condition after enrolling, and a claim for something serious can be denied as related to an undisclosed pre-existing issue.
You're not buying a smaller version of real insurance.
You're buying a different category of product with different rules.
The brokers collecting commissions, the carriers collecting premiums from people who mostly won't file big claims, and arguably the marketplace itself, which looks better by comparison.
Anyone who buys one thinking it's coverage, then faces a hospital bill that runs into five or six figures.
Consumer surveys have repeatedly found that a large share of short-term plan holders didn't realize their plan didn't cover what they assumed.
To be fair, these plans aren't useless in every case.
If you're between jobs for two months, healthy, and mainly worried about a surprise ER visit, a short-term plan can bridge a gap for far less than a COBRA payment.
The problem starts when people treat a bridge as a permanent home—renewing year after year while their risk of a costly diagnosis climbs with age.
If you're considering one, do three things first.
Read the actual policy document, not the summary page—look specifically at the exclusions list and the annual maximum.
Check whether your doctors and hospitals are in the network, because many of these plans use thin networks or none at all.
And price a marketplace plan with subsidies before deciding; the gap is often smaller than the ads suggest, especially if your income qualifies for help.
There's a reason these products keep showing up in your feed.
Cheap sells, and the people most likely to click are the ones most likely to need real coverage.
That asymmetry isn't a bug—it's the business model.
Our take: short-term plans can make sense as a genuine, temporary gap-filler for healthy people, and nothing more.
Treat the low premium as a warning sign, not a win, and assume anything not explicitly covered isn't covered.
Final Thoughts
The cheapest plan is only cheap until you actually need it.