ERA (Electronic Remittance Advice) and its file format, the 835 transaction, is how payers tell you what they paid, what they denied, and why. Manual ERA posting — someone reading the ERA and entering payments by hand — is the single most error-prone and time-consuming task in medical billing. Automation eliminates it.
What an ERA / 835 File Contains
An 835 file is a structured electronic document containing: the payer's response to each claim line submitted, the amount paid or adjusted, the claim adjustment reason code (CO-4, CO-97, PR-1, etc.) for any non-payment, the patient's financial responsibility amount, and the payer's trace number for the payment. One 835 file can contain hundreds of claim responses.
What Manual ERA Posting Gets Wrong
- ✓Payment amount transcription errors — posting $175.40 as $174.50 adds up to significant reconciliation gaps over time
- ✓Missed contractual adjustments — if the payer pays less than contracted, manual posting may not flag it
- ✓Denial codes not captured — a manual poster may post the payment without entering the denial code, making denial tracking impossible
- ✓Balance billing errors — if the patient's responsibility is calculated incorrectly, statements go out wrong
- ✓Slow posting — manual posting delays are the second most common cause of high DSO after denials
What Automated ERA Processing Does
Automated 835 processing ingests the ERA file directly, matches each payment to the corresponding claim, applies the contractual adjustment automatically, posts the patient balance to the patient account, flags any payment that is below the contracted rate, and queues any denied claim for the denial management workflow — all without human data entry.
What Automation Catches That Manual Posting Misses
- ✓Underpayments — every payment is compared against your contracted rate; variances are flagged automatically
- ✓Systematic denials — when the same denial code appears on 20+ claims from the same payer, automation surfaces it as a pattern; manual posting buries it in individual transactions
- ✓Missing ERA files — if a payer batch is expected but not received, automation flags the gap; manual posting just doesn't post anything
- ✓Duplicate payments — automated reconciliation catches when a payer has paid the same claim twice
Every Leymax billing engagement includes automated ERA/835 processing. Zero manual payment posting, systematic underpayment detection, and real-time reconciliation across all payers.
See how we handle ERA processing →