If you've shopped for health coverage between jobs, you've seen them: short-term health insurance plans with monthly premiums that look like a rounding error compared to ACA marketplace quotes.
A 30-year-old in Texas might see $80 a month instead of $450.
That gap is real, and it's exactly why you should slow down before clicking "enroll." These plans, sometimes called short-term limited duration insurance, were designed as a temporary bridge—a few months of coverage while you wait for a job's benefits to kick in.
Federal rules expanded them to terms just under 12 months, and they can be renewed for up to 36 months in many states.
Insurers in this market can reject you for pre-existing conditions, which the Affordable Care Act forbids on marketplace plans.
They can exclude entire categories of care—maternity, mental health, prescription drugs, even emergency room visits—or cap what they'll pay out per year.
A plan might cover a broken arm but not the surgery to fix it.
If you have a chronic condition like diabetes or asthma, you may find nothing related to it is covered at all.
You're buying a catastrophic-only safety net with holes cut into it, and the insurance company has priced that risk carefully in its own favor.
Say you pay $90 a month for a short-term plan instead of $400 for an ACA plan—a savings of $3,720 over a year.
Then you land in the hospital with appendicitis.
The average appendectomy runs $15,000 to $30,000 before insurance.
If your short-term plan caps payouts at $250,000 but excludes the surgeon or the facility as out-of-network, you could owe thousands in the gap.
One hospital stay erases years of premium savings.
A short-term plan isn't guaranteed renewable.
If you get sick mid-term, the insurer can decline to renew you when the term ends—right when you've become expensive to cover.
They also can't charge you more because you got sick.
Who actually benefits from this arrangement?
The insurers selling the plans, and the brokers earning commissions on them.
Those commissions can be higher than what agents make on ACA plans, which gives some sellers an incentive to steer healthy, cost-conscious buyers toward products that may not serve them.
That's not illegal, but it's worth knowing who's getting paid when you get pitched.
So when does a short-term plan make sense?
If you're between jobs for 60 days, healthy, taking no prescriptions, and have cash to cover a deductible that could hit five figures, it's a gamble some people take.
For most Americans—especially anyone over 40, anyone with a diagnosis, anyone who could get pregnant—the math usually favors a marketplace plan.
And if your income is modest, subsidies can drop the sticker price dramatically, sometimes below the short-term quote.
Before you buy anything, check whether you qualify for a subsidy at Healthcare.gov, and ask any broker, in writing, whether they sell ACA plans.
The real problem here isn't that cheap plans exist—it's that they're marketed as equivalents to real coverage.
Final Thoughts
A low premium is a promise about what you'll pay today, not a promise about what you'll owe when something goes wrong, and that's the number that actually matters.