When Insurance Pays but the Ledger Doesn't Match

The deposit arrived. The ERA shows payment for claims you recognize. But when you try to post, the numbers do not match what you expected. Now what?

📚 Part of our insurance series: This article is part of The Complete Guide to Dental Insurance Payments, covering everything from EFT enrollment to ERA matching and payer-specific workflows.

Why Mismatches Happen

Insurance payments should be predictable. You submit a claim, the payer adjudicates it, and payment arrives matching the ERA. In practice, numerous factors create discrepancies between what you expect and what arrives.

Understanding why mismatches happen helps you investigate and resolve them efficiently.

Common Mismatch Scenarios

Payment differs from allowed amount expectations when the insurance company pays an amount different from what your fee schedule or contract suggests. This happens because fee schedules change and your records may be outdated. The procedure may have a different allowed amount than you assumed. The patient's plan may have different benefits than you verified. There may be a frequency limitation or waiting period affecting the claim.

Investigation starts by reviewing the ERA adjustment codes to understand why the payment differs from expected. Contact the payer if the explanation is unclear or seems incorrect.

Payment differs from submitted amount when the check or EFT is less than what you billed. This is normal for contracted providers because the difference between submitted and allowed is a contractual write-off. The ERA will show CO-45 or similar adjustment codes indicating the contractual reduction.

Partial payment received occurs when insurance pays less than the full amount expected even after contractual adjustments. Common causes include deductible not met so the patient owes more, annual maximum reached, procedure paid at lower percentage than expected, and coordination of benefits with another payer.

Investigation starts by reviewing patient eligibility and benefits, checking if deductible applies, verifying annual maximum status, and confirming COB information.

Payment received for wrong patient happens when the ERA shows a patient name you do not recognize or payment applied to the wrong account. This occurs because the subscriber and patient differ and you posted to the wrong person, there is a data entry error in subscriber ID, or there is a payer system error matching claims incorrectly.

Investigation starts by checking the subscriber information on the ERA and verifying the claim was submitted with correct patient and subscriber data.

ERA shows payment but deposit does not match when the ERA total differs from the bank deposit amount. Common causes include multiple ERAs combined in one deposit, take-backs or recoupments deducted, timing differences between ERA and deposit, and deposits applied to multiple bank accounts.

Investigation starts by looking for other ERAs from the same date range, checking for negative amounts on the ERA, and verifying deposit account information.

Investigation Process

Start with the ERA as your source of truth for what the payer says they paid. Review header information confirming payer, date, and total. Check each claim for patient identification, service dates, payment amounts, adjustments with reason codes, and patient responsibility amounts.

Compare ERA to bank deposit by matching the ERA total to a specific bank deposit. If totals do not match, look for other ERAs that combine to the deposit total or take-backs reducing the deposit.

Compare ERA to PMS expectations by checking whether the posted payment matches what you expected based on fee schedules, contracts, and patient benefits. Note any significant variances for investigation.

Research unexplained variances by contacting the payer if adjustment codes do not explain the difference, reviewing patient eligibility and benefits, checking claim submission for errors, and verifying contract terms and fee schedules.

Resolution Actions

Correct posting errors when investigation reveals the payment was posted incorrectly. Adjust the patient account to reflect the correct payment, update related accounts if funds were applied to the wrong patient, and document the correction for audit trail.

Write off contractual amounts when the ERA confirms the payment is correct and the difference is a contractual adjustment. Post the write-off with appropriate adjustment code and verify the patient balance is correct.

Bill the patient when investigation confirms the remaining balance is patient responsibility. Transfer the balance to patient responsibility and follow up according to your collection process.

Appeal denied or underpaid claims when investigation suggests the payment is incorrect. File appeal within the required timeframe, include supporting documentation, and track appeal status through resolution.

Request ERA reissuance if investigation reveals the ERA contains errors. Contact the payer to request corrected ERA and hold posting until the correction arrives.

Preventing Future Mismatches

Verify eligibility carefully before treatment to set accurate expectations for patient and practice.

Use current fee schedules by updating your system when contracts change.

Post from ERA rather than expectations by applying exactly what the ERA shows rather than what you expected.

Review adjustments during posting rather than accepting everything automatically.

Reconcile daily by matching deposits to ERAs and investigating variances immediately while details are fresh.

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