What Is EOB (Explanation of Benefits)?
An Explanation of Benefits is a payer-issued document sent to the member (and sometimes the provider) after claim adjudication that itemizes the services billed, allowed amount, plan payment, deductible/coinsurance/copay applied, and patient responsibility.
- When patients call about EOBs, billing staff need to reconcile the EOB with the practice's actual posted balance and patient statement.
- Discrepancies often trace to credit balances from secondary insurance, capitation adjustments, or write-offs not yet posted.
EOB (Explanation of Benefits)
Also known as: Explanation of Benefits; Member EOB
An Explanation of Benefits is a payer-issued document sent to the member (and sometimes the provider) after claim adjudication that itemizes the services billed, allowed amount, plan payment, deductible/coinsurance/copay applied, and patient responsibility.
Definition
The EOB is a member-facing summary document that follows adjudication. It typically lists each claim line with billed charge, contracted/allowed amount, plan payment, member responsibility (deductible, coinsurance, copay), and any denied amounts with explanation. EOBs are not bills — they are statements of benefits applied. The corresponding provider-facing document is the 835 ERA (Electronic Remittance Advice), which contains structured CARC and RARC codes for posting. Many member EOBs now arrive electronically via member portals rather than paper.
Example
After a primary care visit billed as CPT 99213 ($150 charge) the member's EOB might show: Allowed $115 (PPO contracted rate), Plan paid $85, Member copay $30, Member balance $30. The provider receives the same financial detail in the 835 ERA along with PLB segments for any provider-level adjustments.
Common Misconceptions
An EOB is not a bill — that is the most common patient misconception, leading to both overpayment (paying the full allowed amount thinking it's owed) and confusion when the provider's actual statement arrives later. The EOB shows what the payer paid; the practice's statement shows what the patient owes.
Practical Application
When patients call about EOBs, billing staff need to reconcile the EOB with the practice's actual posted balance and patient statement. Discrepancies often trace to credit balances from secondary insurance, capitation adjustments, or write-offs not yet posted.
Related Terms
ERA (Electronic Remittance Advice / 835)
The ERA (X12 835 transaction) is the HIPAA-standard electronic file payers send to providers detailing claim adjudication results — payments, adjustments, denials with CARC/RARC codes — typically paired with EFT funds transfer.
Read definitionAdjudication
Adjudication is the payer-side process of reviewing and determining how a claim will be paid: applying eligibility, benefits, coverage rules, contracted rates, and edits to determine the allowed amount, paid amount, patient responsibility, and any denials or adjustments.
Read definitionCARC
A Claim Adjustment Reason Code is a standardized code maintained by the X12 External Code List committee that explains why a claim line was adjusted (paid less than billed, denied, or transferred to patient responsibility) on a payer's 835 ERA.
Read definitionRARC
A Remittance Advice Remark Code is a code carried on the 835 ERA that either adds explanation to an adjustment already described by a CARC or conveys information about remittance processing. X12 publishes the list as external code list 411 and names CMS as its maintainer.
Read definitionPayment Posting
Payment posting is the revenue cycle step where insurance payments (from 835 ERA or paper EOBs) and patient payments are applied to specific claim lines and patient accounts in the practice management system, including contractual adjustments and denial transfers.
Read definitionWhere This Applies on MedPrecision
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