Open enrollment comes around once a year, and most people treat it like a chore. Click through the same plan as last year, confirm the payment method, done. That five-minute habit costs a lot of people serious money and leaves them stuck with coverage that no longer fits their life.

The decisions you make during open enrollment follow you for the next twelve months. A mistake made in November becomes a financial problem in February. Knowing the most common errors upfront gives you a real chance to avoid them.

Mistake One: Auto-Renewing Without Reviewing Your Plan

Staying on last year's plan feels like the safe choice. It is often the expensive one. Insurers routinely adjust premiums, deductibles, network compositions, and drug formularies each year. A plan that covered your preferred specialist last year may have dropped them from the network. A medication you take every month may have moved to a higher formulary tier. Your premium may have jumped $50 a month without any notice you actually read.

Before clicking renew, log into your insurance portal and pull up the summary of benefits for your current plan. Then compare it to every other available option. Pay particular attention to whether your doctors are still in-network and whether your regular prescriptions are still covered at the same cost level. If either of those has changed, your auto-renewal is working against you.

This matters even more if your life circumstances shifted during the year. A marriage, a new baby, a job change, or a move can all make last year's plan a poor match for this year's needs. Open enrollment is the one moment you have to course-correct without a qualifying life event, so treat it seriously rather than as a formality.

Our guide on avoiding costly open enrollment mistakes covers additional errors that consistently hurt families when they rush this decision.

Mistake Two: Choosing Based on Premium Alone

The lowest monthly premium feels like the obvious choice, especially when money is tight. But a plan with a $150 lower premium and a $3,000 higher deductible does not save you money if you end up using your health coverage more than twice. Low-premium plans typically shift more of the cost burden to you at the point of care, meaning every doctor visit, specialist appointment, or prescription comes with a higher price tag until you meet your deductible.

To compare plans accurately, you need to estimate your likely annual healthcare spending. Think about how many times you visited a doctor last year, any prescriptions you fill regularly, any planned procedures or specialist visits you already know are coming. Then run the math on what those services would cost under each plan option, factoring in deductibles, copays, and coinsurance.

High-deductible health plans paired with a Health Savings Account can be genuinely powerful for people who are healthy and disciplined about saving. But they are a poor fit for someone managing chronic conditions or expecting significant medical expenses, where the lower-deductible plan's higher premium actually saves money in the long run.

Mistake Three: Missing Dependent and Beneficiary Updates

Open enrollment is not just about choosing your own coverage. It is the right time to review who is on your plan and whether your coverage elections still reflect your family's actual situation. A child who aged off your plan, a divorce that was finalized during the year, or a new dependent who was never added properly can all create coverage gaps or billing complications you discover at the worst possible time.

While you are reviewing dependents, check your beneficiary designations on any life insurance or flexible spending accounts tied to your employer benefits. These designations often sit unchanged for years, and outdated information on a beneficiary form can create legal and financial complications for your family.

If you have a Flexible Spending Account, confirm whether your employer's plan allows rollover of unused funds or offers a grace period into the next year. FSA funds that are not used or carried over are simply lost, and many employees discover this only after the deadline has passed.

Mistake Four: Ignoring the Network Before You Commit

Choosing a plan without checking whether your doctors are in-network is one of the most reliably painful mistakes in health insurance. Insurers can change their provider networks between plan years, and a physician who accepted your plan last January may be out-of-network by the following January.

Before finalizing your enrollment, visit the insurer's provider search tool and verify each doctor you see regularly. Check your primary care physician, any specialists you use, your preferred hospital, and any urgent care centers you have visited. Do this every year, not just when you are switching plans, because the network your plan had last year is not guaranteed to be the same one it has next year.

Open enrollment is genuinely one of the most important financial decisions most households make each year. Treating it with the same care you would give any other decision with a four-figure price tag attached is exactly the right approach.