Open Enrollment Without the Guesswork: A Step-by-Step Walkthrough

Before you compare any plans, gather information about how you actually used your coverage. Look at your Explanation of Benefits statements or your insurer's online account to see how many times you visited a doctor, filled a prescription, or used any specialist care. This gives you a realistic baseline rather than a guess.

Write down every prescription you currently take, including the dosage. Drug formularies (the lists of covered medications) vary between plans, and a medication that costs $10 a month on one plan can cost significantly more on another.

Open enrollment dates differ depending on where you get coverage. For Marketplace plans under the Affordable Care Act, the federal window typically runs from November 1 through January 15, though some states that run their own exchanges set different dates. Employer plans set their own windows, often in the fall. Medicare's Annual Enrollment Period runs October 15 through December 7 each year.

Missing your window generally means you cannot change plans until the next enrollment period unless you have a qualifying life event, such as losing other coverage, getting married, or having a child. Check the exact dates for your situation and add a calendar reminder well before the deadline.

Most plans fall into a few common structures. An HMO (Health Maintenance Organization) requires you to choose a primary care doctor and get referrals to see specialists. A PPO (Preferred Provider Organization) lets you see specialists without a referral and gives you some coverage even for out-of-network providers, usually at a higher cost. An EPO (Exclusive Provider Organization) works like a PPO for the network but typically offers no out-of-network coverage at all.

For a side-by-side look at how HMOs and PPOs handle networks and referrals, see our HMO vs. PPO comparison.

The monthly premium is the amount you pay to keep coverage active, but it is rarely the only significant cost. Look at these figures for each plan you consider:

• Deductible: the amount you pay before the plan starts covering most services
• Copay and coinsurance: your share of each visit or service after the deductible
• Out-of-pocket maximum: the most you would pay in a year before the plan covers 100 percent of covered costs

A plan with a low premium often has a higher deductible. If you use a lot of care, a slightly higher premium with a lower deductible may cost you less overall by year's end.

Every plan maintains a network of contracted providers. Before you enroll, go to the plan's provider directory and confirm that your primary care doctor, any specialists you see regularly, and your preferred hospital are listed as in-network. Provider directories can change, so check the current version rather than relying on last year's information.

Do the same for medications. Look up each drug you take in the plan's formulary. Note which tier it falls under, since higher tiers carry higher cost-sharing. If a medication is not on the formulary, ask whether an exception process exists before assuming you will have to switch drugs.

If you buy coverage through HealthCare.gov or a state exchange, you may qualify for a premium tax credit based on your household income and size. The Marketplace's built-in calculator estimates this when you enter your information. Eligibility rules have changed in recent years, so even if you were not eligible before, it is worth checking again.

If you have access to employer coverage, the calculation is more involved. Our article on employer coverage versus Marketplace plans walks through how to think about that comparison.

Once you have chosen a plan, complete your enrollment through the appropriate channel: your employer's benefits portal, HealthCare.gov, your state exchange, or Medicare's website. After submitting, you should receive a confirmation number or email. Keep that record.

Watch for your new insurance card in the mail or available for download, and confirm the effective date of coverage. If you are switching plans, do not cancel any existing coverage until you have written confirmation that the new plan is active.