The explanation of benefits, decoded

An explanation of benefits is the insurer's account of a claim: what was billed, what was allowed, what they paid, and what you owe.

It is worth reading, because medical billing error rates are high enough that checking pays.

The columns

Billed amount. What the provider charged. Largely fictional in the sense that almost nobody pays it — it is the starting point for negotiated rates.

Allowed amount. The contracted rate between insurer and provider for that service. This is the real price.

Provider discount or adjustment. The difference between billed and allowed, which an in-network provider must write off.

Plan paid. The insurer's share.

Patient responsibility. Your share — deductible, copay, coinsurance, or non-covered amounts.

Remark codes. Abbreviated explanations, defined in a key usually on the reverse or in an appendix. Read them; they explain denials.

What to check every time

Did you receive the service? On the date shown, from that provider.

Billing for services not rendered occurs, sometimes through error and occasionally through fraud.

Is the provider correctly identified as in or out of network? Misclassification happens and produces much larger patient responsibility.

Does the patient responsibility match your plan design? If you have a $40 specialist copay and the document shows $180 of coinsurance, something is wrong.

Has your deductible been applied correctly? Compare the running total to your own records. Deductible accumulators do go wrong, particularly when claims process out of order.

Was preventive care processed as preventive? A common and expensive error.

Services required to be covered without cost sharing when coded as preventive are frequently coded diagnostically instead, generating a bill. A screening colonoscopy that becomes diagnostic when a polyp is found is the classic case, and the rules on this have been clarified in ways that favor the patient in many circumstances.

If a preventive service generated a charge, this is worth challenging.

The duplicate and unbundling problems

Duplicate billing. The same service appearing twice, often with slightly different dates or codes.

Unbundling. Services that should be billed under a single comprehensive code billed separately, producing a higher total.

Upcoding. Billing a higher-intensity service than was provided — a fifteen-minute visit coded as a forty-minute one.

These are detectable by comparing the explanation of benefits to what actually happened and to the itemized bill.

Get the itemized bill

The provider's summary statement shows a total. Request the itemized bill, which lists every charge with codes.

You are entitled to it, and it is where errors become visible.

Compare it line by line against the explanation of benefits and against your recollection of the visit.

Look for: services you did not receive, supplies charged separately that should be included, medications you declined, and duration-based charges that do not match the actual time.

Timing

The explanation of benefits usually arrives before the provider's bill. Do not pay a provider bill until you have the corresponding explanation and have checked it.

Paying first and disputing later is much harder than the reverse.

If a bill arrives without a corresponding explanation, the claim may not have been submitted to the insurer at all. Call and ask.

When something is wrong

Provider errors — wrong code, duplicate, service not rendered — go to the provider's billing department. Ask for a corrected claim to be submitted to the insurer.

Insurer errors — wrong network status, wrong benefit applied, deductible miscounted — go to the insurer. Reference the claim number.

Denials follow the appeal process, and the explanation of benefits contains the denial reason code, which tells you what to address.

Document every call. Get commitments in writing.

The reprocessing timeline

Corrections take time — frequently thirty to sixty days for a corrected claim to be resubmitted and reprocessed.

During that time, notify the provider in writing that the account is in dispute, so it is not sent to collections.

Medical debt in collections has consequences, and reporting rules for medical debt have changed in recent years in ways generally favorable to consumers. Still, avoiding it entirely is better.

Keeping records

Keep every explanation of benefits for at least the plan year plus a few years.

They establish what was paid toward deductibles and out-of-pocket maximums, they support flexible spending and health savings account substantiation, and they are the evidence in any dispute.

Most insurers make them available in a member portal, which is convenient and worth downloading rather than relying on continued access.

The habit

Ten minutes per document. Check the service, the network status, the patient responsibility and the deductible accumulation.

Given how frequently errors occur, and how large some of them are, this is among the better uses of ten minutes available.

General information about insurance processes, not insurance, legal or medical billing advice. Plan terms and billing rules vary. Consult your insurer, provider and policy documents.