The pitch lands in your inbox right after a layoff or a dropped marketplace plan: coverage for as little as $80 a month.
For anyone staring down a $600 COBRA bill, that number is hard to scroll past.
Short-term health insurance is having a moment.
These plans are not Affordable Care Act coverage, and that distinction drives everything about how they work.
The first thing to understand is who says no.
Under ACA rules, insurers must cover you regardless of pre-existing conditions and must pay for ten essential benefits, including prescriptions, maternity care, and mental health treatment.
Short-term plans follow a different rulebook.
They can reject you for a diagnosis, charge more because of your age or health history, and cap how much they pay out in a year.
Many exclude prescription drugs entirely or cover them at a fixed dollar limit.
The premiums are low because the plans are narrow.
A 2020 study in the journal Health Affairs found that short-term plans paid out roughly half the share of premiums in medical claims that ACA marketplace plans did, meaning far more of the cost lands on the enrollee.
Federal rules currently limit these plans to three months of coverage, with an option to renew for up to 12 months total in most states.
That structure sounds manageable until you actually get sick.
If you develop a condition during the term, the insurer can decline to renew you when the term ends, and a new diagnosis can follow you as a pre-existing condition when you try to buy another short-term policy.
Some states, including California and New York, have banned or tightly restricted these plans for exactly that reason.
The bill can also arrive long after the hospital visit.
Short-term plans frequently require you to pay the entire cost of care upfront and file for reimbursement yourself, and they may deny a claim if you did not get prior authorization for a procedure that an ACA plan would have covered automatically.
A single emergency room visit or a few days in the hospital can blow past a plan's annual limit, leaving you responsible for the rest.
Where these plans genuinely fit: as a bridge during a short gap, like the weeks between jobs when COBRA has not kicked in or a marketplace plan has not started.
Even then, compare the total exposure, not just the monthly premium.
A marketplace plan may cost more per month but cap your annual out-of-pocket spending and cannot turn you away.
Before signing up, read the exclusions page, not the marketing email.
Check the annual and lifetime payout caps, the prescription drug limit, and whether the plan requires you to pay providers directly.
If the policy does not mention a maximum out-of-pocket limit, assume there is not one that protects you.
If you are between jobs, a special enrollment period on Healthcare.gov usually gives you 60 days from the loss of coverage to sign up, and subsidies can bring the monthly cost down more than people expect.
A licensed navigator can run those numbers for free.
The appeal of a low premium is real, especially when rent and groceries are already stretching the budget.
But the cheapest monthly payment is not the same as the cheapest year, and the gap between those two numbers tends to show up at the worst possible time.
Final Thoughts
Read the fine print before the medical bill does it for you.