If you've priced health coverage lately, you've probably seen the ads.
Short-term health insurance plans promising premiums of $80, $100, maybe $150 a month, plastered across search results and social feeds.
Compared to a $500-plus ACA marketplace plan, the pitch feels like finding money on the sidewalk.
The catch is buried in the fine print, and it's bigger than most shoppers realize.
These plans, technically called short-term, limited-duration insurance, were originally designed as a stopgap.
You lost a job, you're between coverage, you need something for 60 or 90 days.
Federal rules expanded them in 2018 to last up to 364 days and be renewed for up to three years in many states.
That turned a temporary bridge into what critics call a parallel insurance system with fewer rules.
Short-term plans don't have to cover the ten essential health benefits that ACA plans must include.
That list covers prescription drugs, maternity care, mental health treatment, and preventive services.
They also practice medical underwriting, meaning they can reject you outright for a pre-existing condition like diabetes, asthma, or a past cancer diagnosis.
Here's where it gets expensive in a hurry.
A 2020 study in the journal Health Affairs found that short-term plans denied roughly one in three claims, compared with about one in five for ACA marketplace plans.
Some of the denials came from consumers not realizing their policy excluded the very thing they needed.
You pay premiums for months, then blow out your knee or get a surprise diagnosis, and the bill lands on your kitchen table.
The average emergency room visit runs over $1,300, and a three-day hospital stay can top $30,000.
A short-term plan with a $10,000 deductible and a coverage exclusion for your specific condition leaves you holding nearly all of it.
That's how a cheap premium turns into a credit card balance you're still paying off three years later.
None of this means the plans are worthless.
If you're healthy, between jobs, waiting for employer coverage to kick in, or stuck in the gap before Medicare starts, a short-term policy can beat going completely uninsured.
Going bare means paying 100% of every bill.
A short-term plan might cover a broken arm or a routine urgent care visit.
Just understand it's catastrophe-lite, not comprehensive coverage.
A few practical moves if you're shopping.
Read the exclusions list before you buy, not after.
Check whether the plan covers prescriptions, because a single specialty drug can cost more than a year of premiums.
Look at the out-of-pocket maximum, since some plans cap payouts per condition rather than per year.
And check your state's rules, because a handful of states have banned or tightly restricted these plans.
If you have a pre-existing condition, an ACA marketplace plan is almost always the safer route.
Subsidies often shrink the price gap more than people expect, and you can't be turned down or charged more for your health history.
The honest takeaway: short-term health insurance is a tool, not a substitute.
Buy it knowing exactly what it won't pay for, keep your emergency fund intact, and treat the low premium as a warning sign to read every page.
Final Thoughts
Cheap coverage that vanishes when you need it isn't a bargain.