Electronic remittance advice (ERA)

An ERA is the payer’s electronic explanation of a payment. After a payer adjudicates a batch of claims, it issues an 835 transaction that lists every claim in the payment: the billed amount, the allowed amount, the amount paid, and each adjustment with a group code, a claim adjustment reason code and often a remittance advice remark code. CMS says Medicare contractors send every ERA in the X12 835 version 5010 format, which was adopted as the national HIPAA standard for electronic remittance advice, and that a provider who is not set up for ERAs receives a standard paper remittance instead. The file travels through the clearinghouse or directly from the payer into the practice management system, where it is matched to the claims it covers. The money arrives separately. CMS notes that one check or electronic funds transfer covers all the claims itemized in an ERA, and the ERA carries a trace number so the two can be tied together.

ERAs matter because they are the raw material for posting and denial work. CMS describes them as allowing payable amounts and adjustments to post automatically, with no manual data entry. In practice that means denials land in a work queue the day they arrive rather than when someone opens the mail, and the codes that drive denial rate and underpayment reports are captured without keying.

The mistake is enrollment. ERAs do not start on their own. Each payer requires an ERA enrollment, often tied to EFT enrollment, and many route the file to whichever clearinghouse is on record. A payer still sending paper, or an ERA landing at an old clearinghouse after a software change, is a common reason a practice’s posting runs weeks behind.