Know your plan before you check a bill: build a one-page plan profile

People usually describe a health plan by two numbers: the premium and the deductible. In practice a plan has many more settings, and they interact. If you get one wrong when you check a bill, your expected number will be wrong too. That is worse than not checking, because you may accept an overcharge or dispute a correct charge.

The fix is to write your plan's settings down once, on one page, and use that page every time you check a bill.

The settings that change what you owe

• Plan type. HMO, PPO, EPO, POS or a high deductible plan. The label mostly tells you whether out of network care is covered at all and whether you need referrals. On a high deductible plan, most services cost you the full allowed amount until the deductible is met.
• Plan category. Medical, dental, vision and pharmacy usually have separate rules and separate running totals. A dental bill checked against your medical plan won't make sense.
• Network tiers. Some plans split in network providers into tiers with different cost sharing. The tier that applies to a claim isn't printed in advance, which makes it a common source of errors.
• The deductible and out-of-pocket grid. "The deductible" is rarely one number. There can be separate figures for individual and family, for in and out of network, and for each tier.
• Embedded or aggregate. On a family plan, this decides whether each person has their own deductible limit or only the family total counts.
• Reset period. Your totals may reset on January 1 or on your plan's renewal date, and that isn't always the same as the dates your coverage runs.
• Deductible carryover. A few plans credit spending from the last months of one year toward the next year's deductible. If yours does, you may not start the year at zero.
• What counts toward the maximum. Most plans count copays and covered prescriptions toward the out-of-pocket maximum, but some track pharmacy separately, and amounts marked not covered usually don't count at all.

Where to find them

Most of these settings are in your Summary of Benefits and Coverage, often in a single sentence each. The rest are in the full plan document or certificate of coverage, which your insurer or employer can send you. Your insurer's member portal usually shows your current deductible and out-of-pocket totals.

Build the page once

Set aside about half an hour with your plan documents and write down each setting, along with your deductible and out-of-pocket figures for every column that applies to you. If something is unclear, ask your insurer in writing and keep the answer with the page.

After that, every bill you check starts from the same page. Most people who give up on checking their bills do so because they are working out their plan from scratch each time.

Two plans, opposite answers

Picture one family member with $2,000 of in network claims late in the year. On a plan with an embedded deductible and 0 percent coinsurance after the deductible, if that person has already met their individual deductible, they should owe nothing. On a plan with an aggregate deductible where the family total hasn't been reached, the same claims can correctly leave them a large share.

Same claims, opposite correct answers. A bill is only checkable once you know which plan you are on.

General information, not legal, medical or financial advice. Every plan is different, so check the details against your own plan documents.