About This Tool

Built by a health insurance data engineer.I work inside the industry and see how claims are processed, where billing errors occur, and what consumers typically don't know to ask. This site exists to close that gap — giving you the same working knowledge of the system that people inside it already have.

Last reviewed: April 2026

Who this is for

This tool is for people who received an Explanation of Benefits (EOB) from their insurer and want to understand whether it was processed correctly — and what to do if it wasn't. You don't need to know billing codes or insurance jargon. You need a document and a few minutes.

Common situations where this helps:

  • A bill arrived that seems higher than expected after insurance paid its share
  • A claim was denied and you're not sure why or whether to appeal
  • You had a large event (surgery, ER visit, childbirth) and are sorting through multiple bills
  • You want to verify your deductible, out-of-pocket maximum, or coinsurance was applied correctly
  • You received an out-of-network bill after receiving care at an in-network facility

How the review works

When you upload an EOB, the tool parses the document and checks it against a curated set of common billing error patterns. Here is what that process evaluates:

  1. Service and code validation — CPT and HCPCS codes are checked against the service type, setting, and date to surface known patterns for upcoding, unbundling, or duplicate billing.
  2. In-network and out-of-network classification — Provider network status is evaluated against claim processing flags to identify possible surprise billing scenarios or misclassification.
  3. Benefits accumulator check — Deductible and out-of-pocket maximum figures are checked for consistency across claims to flag potential accumulation errors.
  4. Denial code interpretation — Remittance advice remark codes (RARCs) and claim adjustment reason codes (CARCs) are mapped to plain-English explanations and the most common appeal pathways.
  5. Patient responsibility review— The member's share of each line item is assessed relative to standard cost-sharing rules to flag possible overpayment.

Results are organized into a ranked Claim Signal Queue, paired with a Verification Checklist of specific items to confirm before making calls, and an Appeal Prep Path when escalation looks warranted.

What this tool cannot determine

This is educational guidance based on pattern analysis, not a legal or medical determination. The tool works with the data on your EOB and applies heuristic rules — it does not have access to your plan documents, your provider's billing records, your full claims history, or your insurer's adjudication system.

  • Savings estimates are directional, not guaranteed. Actual outcomes depend on your specific plan language and the facts of your claim.
  • Appeal likelihood signals reflect common patterns, not the specifics of your case.
  • This tool does not provide legal, medical, or insurance advice.
  • Always confirm findings with your insurer and provider before withholding payment or filing a formal dispute.

Data and privacy

Uploaded files are used to run the analysis and return results to you. Files are processed for the active request and are not retained for any other purpose. No account is required and no personal health data is linked to your identity on this site.

For full details see the Privacy Policy.

Sources and grounding

Billing error patterns are grounded in publicly available references including CMS billing guidelines, the AMA CPT code set, NUBC and NUCC claim form instructions, and published insurer processing manuals. The denial code library references the standard X12 835 transaction set (CARCs and RARCs). This content reflects my working knowledge from the industry and is updated periodically as patterns evolve.

Ready to review your EOB?

Start My Claim Review