What Is Remittance Advice (EOB)?

What Remittance Advice Means

Remittance advice is the payer's itemized explanation of how claims were adjudicated and paid. It accompanies every payment — whether by check or electronic funds transfer — and lists each claim with billed amounts, allowed amounts, payment amounts, and adjustments. For providers, remittance advice arrives as an Electronic Remittance Advice in HIPAA 835 format or as a paper remittance stub. For patients, the equivalent document is the Explanation of Benefits.

Every line item on a remittance advice includes Claim Adjustment Reason Codes that explain why amounts were reduced, denied, or reassigned to patient responsibility. This is the primary source document for denial management.

Why Remittance Advice Matters

You cannot appeal a denial you have not identified. Remittance advice is where denials first become visible in the revenue cycle — at payment posting, not at patient billing. Billing teams that auto-post ERAs without reviewing adjustment codes miss appealable denials that sit in the system until write-off. With over 90% of payments now arriving electronically as 835 transactions, the remittance advice is the first and most reliable trigger for appeal workflow.

Remittance advice also contains appeal filing deadlines, payer contact information, and claim reference numbers needed for appeal submission.

How Remittance Advice Affects Your Claim

Each remittance advice entry shows the final adjudication outcome for a submitted claim: paid in full, paid with contractual adjustment, denied with zero payment, or partially paid with patient responsibility assigned. Adjustment group codes — CO, PR, OA — determine whether the remaining balance can be billed to the patient or must be written off. CARC codes on the remittance advice define the specific denial reason and dictate which appeal strategy to use. The remittance date starts the appeal deadline clock.

What to Do With Remittance Advice

Configure your practice management system to flag non-zero CARC codes during ERA auto-posting. Route flagged claims to a denial work queue sorted by dollar amount and appeal deadline. Match each CARC code to an appeal template and documentation checklist. Extract appeal deadlines and calendar them immediately. Retain remittance advice linked to the original claim, appeal letters, and payer responses for the full 7-year retention period. Reconcile payment totals against the remittance advice batch to catch underpayments before they become aged receivables.

Frequently Asked Questions

What is the difference between an EOB and remittance advice?

An Explanation of Benefits is the patient-facing version of the payment explanation. Remittance advice is the provider-facing document — either paper or electronic ERA — that accompanies the actual payment. Both contain the same CARC codes, adjustment amounts, and denial reasons, but remittance advice includes provider-specific payment and adjustment detail.

What is an ERA in medical billing?

An Electronic Remittance Advice is the HIPAA-standard 835 transaction that payers send electronically to providers. It replaces paper remittance advice and auto-posts payment and adjustment data into practice management systems. Over 90% of claim payments now arrive as ERAs rather than paper checks with remittance stubs.

Where do I find CARC codes on remittance advice?

CARC codes appear in the adjustment segment of each claim line on the remittance advice. Look for the reason code field next to each adjustment amount — it shows the two- or three-digit CARC code and the adjustment group code indicating whether the amount is a contractual obligation, patient responsibility, or other adjustment.

How long should I keep remittance advice records?

Medicare requires providers to retain remittance advice and related billing records for a minimum of 7 years. Most commercial payers follow similar retention standards. Keep remittance advice linked to the original claim and any subsequent appeal correspondence for the full retention period.