ERA / 835

The ERA (electronic remittance advice), transmitted in the X12 835 format, is the electronic explanation of how a payer adjudicated your claim — line by line, with every payment, adjustment, and reason code.

The ERA is the electronic version of the remittance you used to get on paper — the payer's line-by-line accounting of what it did with your claim. The '835' is the X12 transaction standard the ERA travels in, so people use 'ERA' and '835' interchangeably. It tells you, for each service line, the billed charge, the allowed amount, what the payer paid, what it moved to patient responsibility, and every adjustment with its CARC and group code. It also carries the check or EFT trace number so you can reconcile payments to deposits. The ERA is the single richest data source in your revenue cycle: it's where denials, underpayments, downcoding, and bundling all show up in structured, machine-readable form. An 835 is receiver-specific — it's delivered to whoever is enrolled to receive it for your tax ID at each payer, usually your clearinghouse or billing system, and re-enrolling a new receiver reroutes the feed away from where it was going. Reading the 835 correctly, not just posting the payment off it, is where most missed revenue is found — because the reason codes that explain a short payment are right there in the file.

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