Open enrollment season is here, and if you're like most Americans, you'll spend about 15 minutes picking a health plan and hope for the best.
That approach can cost you hundreds or even thousands of dollars next year.
The plans change every year—premiums, deductibles, networks, drug coverage—even if you don't.
The biggest mistake is auto-renewing without looking.
Your current plan's premium might jump 10% or more, while a nearly identical plan from the same insurer could cost less.
Insurers also shuffle which drugs they cover and which doctors stay in-network.
Loyalty to a plan name means nothing when the details shift underneath you.
Start with one number: your total expected yearly cost, not just the monthly premium.
Add up premiums for the year, then estimate what you'll actually spend on deductibles, copays, and prescriptions.
A cheap premium with a $7,000 deductible can be a trap if you have ongoing medical needs.
Run the math for both a healthy year and a bad year.
Next, check your medications against each plan's drug formulary.
A prescription that cost $30 a month this year can jump to $200 if it moves to a different tier.
Call the insurer or use their online tool.
If you take a brand-name drug, ask whether a generic or alternative is covered.
This single step saves people more money than almost anything else.
That means hospitals, specialists, labs, and urgent care.
If you're mid-treatment or pregnant, confirm your doctors are still in-network for the new plan year.
Out-of-network bills are the fastest way to blow a budget.
Also check whether your plan requires referrals for specialists.
If you buy coverage on HealthCare.gov or a state exchange, mark these dates: open enrollment for 2025 runs November 1 through January 15 in most states.
To have coverage start January 1, you generally need to enroll by December 15.
Miss that and your plan may not kick in until February.
Some states run longer windows, so check your state's exchange.
Two more items people skip: flexible spending and health savings accounts.
If you have an FSA, you usually must re-enroll each year—it doesn't roll over automatically.
Estimate your out-of-pocket medical costs carefully, because unused FSA money can be forfeited.
With an HSA, you keep the funds, but you can only contribute if you're enrolled in a qualifying high-deductible plan.
Finally, if you're on Medicare, your window is different—October 15 to December 7 for Advantage and drug plans.
And if you get insurance through a job, ask HR when your enrollment closes.
Many employers set a hard deadline in November, and missing it usually means waiting a full year unless you have a qualifying life event like marriage, a birth, or a job loss.
Set a calendar reminder for two weeks before your deadline.
Gather your list of doctors, medications, and last year's medical bills.
Then compare at least two plans side by side.
It's a couple of hours of work that can pay off all year.
My take: this is one of the few financial chores where a little effort reliably saves real money, and the penalty for skipping it is invisible until the bills arrive.
Treat the deadline like a tax date—put it on your calendar and don't wing it.
Final Thoughts
Your future self, staring at a surprise medical bill, will thank you.