A bill arriving after insurance has processed the claim is one of the most confusing documents in healthcare. Here's how to read it, and what to do when it looks wrong.
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When your insurer processes a claim, they send you an Explanation of Benefits (EOB), not a bill, but a summary of what they covered and why. The bill from your provider should match the patient-responsibility amount on your EOB. When they don't match, something went wrong. Start there: pull both documents and compare them line by line before paying anything.
Your claim may have been filed without your insurance information (especially common with specialist visits or ERs where a separate billing company handles claims). The provider may be out of network without you realizing it. Your deductible or out-of-pocket maximum may have been calculated incorrectly for the plan year. Or your claim may have been denied for a reason that doesn't hold up to review, lack of prior authorization is one of the most commonly overturned denials.
Call your insurer first, not the provider. Confirm the claim was received and processed. If it wasn't filed at all, your insurer may be able to direct you to resubmit it. If it was filed incorrectly, wrong member ID, wrong date of service, wrong provider, ask the insurer what information was submitted and what the correct information should be, then contact the provider's billing office with that detail.
If your insurer denied a claim and you believe the denial was incorrect, you have the right to appeal. Request the denial letter if you don't already have it, it must explain the reason. Your insurer is required to have an internal appeals process, and many states require external review by an independent organization for certain types of denials. File the appeal in writing, include your provider's clinical notes if you can get them, and meet any deadline stated in the denial letter.
If you received emergency care or care at an in-network facility and received a bill from an out-of-network provider you didn't choose, an ER physician, anesthesiologist, or radiologist, federal law (the No Surprises Act) limits what you can be charged. Your liability is generally capped at your in-network cost-sharing. If you received a bill above that, contact your insurer and reference the No Surprises Act.
We review your itemized bill and check whether charges line up with how your insurance should have applied, flag billing patterns that often signal claim-processing errors, and prepare written documentation if a dispute or appeal is the right next step. The review is free.
For informational purposes only. Not legal, medical, or insurance advice. Confirm details with your provider, insurer, or a qualified professional.
The review is free. Worst case, you get peace of mind that your bill is clean.
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