How to Find Underpayments by Re-Adjudicating Paid Claims

What Does It Mean to Re-Adjudicate a Paid Claim?

Adjudication is the process payers use to determine what a medical claim is worth and what they will pay. To re-adjudicate a paid claim means running that identical calculation internally, using the practice's copy of the payer contract instead of the payer's system. This establishes an expected allowed amount for every line item.

By comparing the expected amount to what the payer actually paid, the practice treats the payer's reimbursement as a figure to be audited rather than an absolute fact. Standard posting routines simply log the remit and close the balance. Re-adjudication, conversely, questions whether the payer honored the agreed-upon rates. Understanding how a payer adjudicates a claim is the first step to checking their math.

Key Takeaways:

• Re-adjudication recalculates claims internally against contracted rates.
• It produces an expected allowed amount for line-by-line comparison.
• The process treats payer reimbursements as auditable claims, not final facts.

Why Do Underpayments Bypass Standard Denial Reports?

Underpayments do not trigger alerts on a denial report because the payer technically accepted and processed the claim. The practice management system logs a payment, reduces the balance, and writes off the remainder as a contractual adjustment or bills it to the patient.

A traditional denial generates a clear signal: the claim remains open, and a reason code demands attention. A short payment produces no distinct alert, which is how denial recovery differs from an underpayment appeal. The adjustment code on an underpaid line is often identical to the code used on correctly paid lines.

Denial vs. Short Payment

Key Takeaways:

• Short payments hide behind standard contractual adjustment codes.
• Paid claims bypass denial workflows entirely.
• Comparing actual payments to expected rates is the only way to flag them.

What Data Do You Need to Find Underpayments by Re-Adjudicating Paid Claims?

A practice needs three core components before it can successfully re-adjudicate: the full payer contract, the 835 remittance advice, and the original submitted claim. Without all three, exact line-by-line comparisons are impossible.

The payer contract is often the most complex component. It typically includes a base agreement, fee schedule exhibits, rate amendments, and an incorporated provider manual. The fee schedule might list flat rates or use a percentage of a referenced benchmark.

The 835 remittance advice is the standard electronic transaction where payers detail what they allowed, paid, and adjusted. Finally, the original claim data confirms exactly what modifiers and units were submitted, ensuring the practice does not dispute a payment that was technically correct for a flawed submission.

Key Takeaways:

• Re-adjudication requires the contract, 835 remit, and submitted claim.
• Contracts include fee schedules, amendments, and provider manuals.
• Paper remits create blind spots for underpayment detection.

How Is the Expected Allowed Amount Calculated?

The expected allowed amount is the specific contracted rate for a procedure code, modified by any payment rules applicable to that exact claim. This base rate is pulled from the fee schedule in effect on the date of service, not the payment date or contract signing date.

Payment adjustments require precise calculations. Modifiers, multiple-procedure reductions, and unit limits all alter the final expected amount. These contractual rules must be applied in the exact sequence the payer uses; otherwise, the resulting expected amount will be inaccurate, generating false positive short payments.

Key Takeaways:

• Base rates tie to the fee schedule active on the date of service.
• Modifiers and multiple-procedure rules alter expected payouts.
• Calculation rules must mirror the payer's exact application sequence.

What Qualifies as a True Short Payment?

A true short payment occurs when a payer's allowed amount falls below the contracted rate, completely independent of patient responsibility. Copays, deductibles, and coinsurance are never classified as short payments because they represent the patient's share of the contracted rate, not a payer deficit.

Many discrepancies masquerade as short payments but are entirely legitimate. Claims reduced under valid multiple-procedure rules, secondary payer coordination protocols, or contractually agreed-upon bundling edits are technically paid correctly.

Actual short payments occur when payers apply outdated fee schedules, ignore valid modifiers, slash unit counts without justification, or default to out-of-network rates due to internal loading errors. These are the discrepancies a practice can successfully dispute.

Key Takeaways:

• Patient responsibility (copays, deductibles) does not equal a short payment.
• Valid contract bundling and multiple-procedure edits are not underpayments.
• True short payments often stem from outdated fee schedules or ignored modifiers.

What Happens After a Short Payment Is Found?

Once an underpayment is identified, it must be documented alongside the specific contract clause it violates and the 835 remit proving the shortfall. A decision-maker on the practice's side then determines whether to initiate a formal appeal.

An underpayment appeal presents the contract language, outlines the correct mathematical calculation, and demands the missing balance. Depending on internal workflows, this task may fall to in-house staff or an external billing partner. Determining who makes the decisions on a flagged short payment is vital for efficient resolution.

Key Takeaways:

• Short payments must be linked to the breached contract clause and remit.
• Appeals require clear mathematical proof of the discrepancy.
• The practice or its billing company retains final decision-making authority.

How Often Should Practices Re-Adjudicate Paid Claims?

Every paid claim should undergo re-adjudication the moment its electronic remit arrives in the system. Spot-checking a random sample of claims once a quarter highlights broad trends but leaves the vast majority of short payments undetected and uncollected.

Analyzing the remit immediately aligns with strict contractual appeal windows, which begin counting down the day the remit is issued. Immediate underpayment detection ensures that flagged claims land directly in the current workflow of the billing team, eliminating the need to hunt down months-old data.

Key Takeaways:

• Re-adjudicate 100% of claims upon remit arrival, not just a sample.
• Immediate auditing prevents missing strict contractual appeal deadlines.
• Real-time flagging keeps corrections inside the active billing workflow.

How Does Daybook Health Re-Adjudicate Paid Claims?

Daybook Health integrates directly with a practice's existing practice management (PM) system to audit arriving remits. Using advanced agents that re-adjudicate every paid claim, Daybook systematically compares every processed line item against the exact payer contract rates, specializing in complex environments like Medicare Advantage coverage support for skilled nursing facilities.

When a payment falls short, Daybook automatically drafts an appeal containing the specific contract clause and remit data. Daybook operates as a point solution, proposing actions rather than executing them; the practice or its billing company retains total control over filing appeals or approving write-offs. Practices seeking complete revenue cycle handoffs are directed to Daybook's verified partner network.

Key Takeaways:

• Daybook Health checks every paid line against specific payer contracts.
• AI agents draft targeted appeals with supporting remit and contract data.
• Human staff retain 100% authority over filing appeals and write-offs.