How to read an Explanation of Benefits after a therapy visit

An Explanation of Benefits can look like a bill and sound like a final answer. Usually, it is neither. An EOB is the health plan’s explanation of how it processed a claim. It can show what the provider charged, what the plan allowed, what the plan paid, and what the plan says may be your responsibility. The provider’s bill is a separate document.

That distinction matters after a therapy visit. A surprising balance could come from a clinical denial, a coding or claim problem, a network rule, a deductible, a missing authorization, or a statement that has not caught up with the plan’s adjustment. Start by identifying the document and the transaction before deciding what to challenge.

First: confirm that it is an EOB

Look for wording such as “This is not a bill,” “claim detail,” “amount allowed,” or “your responsibility.” Then match:

• member and provider;
• date of service;
• claim number;
• service description or code;
• the version or processing date.

Use fictional or redacted documents when asking anyone outside the plan, provider, or authorized representative for general help. An EOB can contain health and identity information.

Read the money columns in order

1. Provider charge: what the provider submitted.
2. Allowed amount: the amount the plan uses under its rules or contract.
3. Plan paid: the amount the insurer says it paid.
4. Deductible, copay, or coinsurance: cost-sharing assigned to the member.
5. Not covered or denied: an amount the plan did not pay, often paired with a reason code.
6. Patient responsibility: the amount the EOB says you may owe.

Do not subtract the columns yourself and treat the result as final. Network contracts, coordination of benefits, adjustments, and provider write-offs can change what may legally or contractually be billed. Compare the EOB with the provider’s statement and ask both sides to explain any mismatch.

Find every reason code and footnote

The most important sentence may be in small print on the last page. Circle each code next to the therapy line and find its full explanation. Common categories include:

• authorization was missing or did not match;
• the service was considered not covered;
• the plan says the provider was out of network;
• the plan says the service was not medically necessary;
• information or coding was incomplete;
• the deductible or other cost-sharing applied;
• the claim was a duplicate or was submitted too late.

Do not translate all of those into “medical necessity.” If the EOB does use that phrase, preserve the exact wording and look for a separate adverse-benefit or denial notice that states the clinical reason, criteria, reviewer, and appeal rights.

Put four documents side by side

• the EOB;
• the provider’s bill or ledger;
• the plan’s denial or authorization notice;
• the relevant benefit or network section of the plan document.

The EOB processed the March 4 therapy claim as out of network, but the denial notice says no authorization; the provider bill asks for the full charge.

That sentence exposes the inconsistency without guessing which document is right. If there is no denial notice, request the complete reason and appeal instructions. If the provider believes the claim was coded incorrectly, ask what correction they will submit and when. If the plan says the claim was adjusted, ask for the new EOB and adjustment number.

Is an EOB enough for an appeal?

It is evidence, but often not the whole record. A clean appeal packet may also need:

• the complete adverse-benefit determination;
• the treatment request or authorization;
• the relevant clinical record or clinician letter;
• plan criteria cited in the decision;
• proof of network status or an access problem;
• a short timeline of calls and resubmissions.

The appeal route depends on the plan. A fully insured plan may be regulated by DMHC or CDI. A self-funded employer plan may use a federal process even when a familiar insurer administers it. Request unclear plan-type answers from the employer or plan administrator in writing.

Three questions for the plan

1. What exact reason code and plan provision caused this claim outcome?
2. Was a separate denial or adverse-benefit notice issued, and how can I get the complete copy?
3. What action would change the outcome: corrected claim, authorization review, grievance, or appeal?

Ask for the representative’s name or ID, the reference number, and the expected next date. After the call, write a short factual note.

What the EOB cannot prove by itself

An EOB does not necessarily prove that you owe the listed amount, that the provider may balance bill you, that the plan’s reason is clinically correct, or that a deadline has been extended. It also does not prove which regulator controls the plan. Treat it as a map of one claim-processing event.

The point

Read an EOB as a sequence: identify the claim, follow the money columns, decode every reason, compare the denial and bill, then ask what process can actually change the outcome. The goal is not to become a claims expert. It is to turn a confusing page into a specific, checkable dispute.