Twenty-Five Percent That Isn't in the Contract
A surgical group has a commercial contract paying 118% of Medicare for surgical codes, with a multiple-procedure reduction of 100% for the highest-valued procedure and 50% for each additional procedure in the same operative session. A claim contains three codes: 29827 (Medicare allowed $1,800), 29826 ($700), and 29824 ($500). The contracted allowable is therefore $2,124 for the first, $826 for the second, and $590 for the third. After the multiple-procedure reduction, the expected allowed amount is $2,832. The payer paid $2,124 plus $206.50 plus $147.50, for $2,477.50 - the additional procedures were reduced by 75%, not 50%. Patient coinsurance was calculated at 20% of the amount paid rather than the contracted allowable. The group runs roughly 1,400 multi-procedure claims a year. A first-level appeal was denied with the boilerplate line "paid per contract."
1. Quantify the error and explain exactly what the payer did. What evidence do you need before escalating?
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The math identifies the mechanism. Expected: $2,124 + $413 (50% of $826) + $295 (50% of $590) = $2,832. Paid: $2,124 + $206.50 + $147.50 = $2,477.50. The shortfall is $354.50, or 12.5% of the expected allowable. The tell is that $206.50 is exactly 25% of $826 and $147.50 is exactly 25% of $590.
That pattern means the payer did not misread the contract for this claim - its system applies a 25% rule, or stacked a second reduction on top of the contracted one. A one-off clerical error does not produce clean 25% figures on two separate lines. This is a configuration problem in the payer's pricing engine, and configuration problems are claim-type-wide, not claim-specific.
Before escalating, pull three things: the contract page and signature block showing the multiple-procedure language, the fee schedule exhibit incorporated by reference, and any amendment showing the 118% rate is current. Payers routinely argue the rate on file is an older schedule. Then sample ten other multi-procedure claims from the prior six months and calculate the same variance. If they all show 25%, you no longer have a claim dispute; you have a contract-performance variance, and that reframes who you talk to.
2. The appeal was denied as "paid per contract." What is the next move, and why is a second appeal the wrong channel?
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A second appeal goes to the same unit that just approved the same pricing logic, using the same system that generated the error. You will get the same letter. The right channel is provider relations or the contracting officer, with a contract-performance package, because the remedy you need is a system configuration change and a retroactive repricing sweep - not an adjudication of one claim.
Build the package in dollars: $354.50 per claim times 1,400 claims a year is roughly $496,300 annualized. Escalate with a sample of ten claims, the contract language, the fee schedule exhibit, and a spreadsheet showing the same 25% signature on every line. Ask for two specific things in writing: correction of the pricing configuration and a retroactive review of all affected claims in the lookback period. Ask for the name of the person who owns the fee-schedule load.
Keep filing individual appeals on the sampled claims only to preserve appeal deadlines - contract and state prompt-pay limits run whether or not the relationship discussion is going well. Do not let the escalation conversation substitute for deadline protection. And put the annualized number in the first paragraph; a $354 dispute gets ignored, a $496,000 dispute gets a meeting.
3. The payer eventually pays the contracted amount correctly. Should the group now bill the patient the additional 20% coinsurance that was under-calculated?
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Technically the patient owes 20% of the contracted allowable: 20% of $2,832 is $566.40, versus the $495.50 collected on the original paid amount. The difference is about $70.90 per patient. Practically, the answer is usually no, and the reason is not generosity - it is risk and cost.
Rebilling a patient months after the fact for a payer's calculation error creates a complaint, a call to the payer, and sometimes a regulatory inquiry, all to recover $70.90. Many contracts also bar balance-billing patients for amounts the payer failed to pay, and some state laws restrict late patient billing. The contractual remedy for a payer's underpayment runs against the payer, not the patient.
So pursue the payer for the full $2,832 and absorb the coinsurance delta. Where the patient has already paid the higher amount, refund promptly - the payer's correction may generate an overpayment on the patient side, and sitting on it creates a credit-balance liability.
Fix the forward-looking problem instead: audit claims where coinsurance was calculated on paid rather than allowed amounts. That error pattern means the payer's patient-responsibility calculation is also misconfigured, which will generate both under-collections and refund obligations across the same 1,400 claims.