Underpayment From Incorrect Multiple-Procedure Reduction
A practice has a contract with a commercial payer that sets the allowed amount for CPT 11403 at $800 and CPT 11402 at $600. The contract states that when a second surgical procedure is performed in the same operative session, the secondary procedure is reimbursed at 75% of its allowed amount. On May 5, the surgeon excised a 3.5 cm benign lesion from the back (11403) and a 2.5 cm benign lesion from the arm (11402). The claim reported 11403 as primary and 11402 with modifier 51. The payer processed the claim with allowed amounts of $800 for 11403 and $300 for 11402, paid 80% of the total, and applied 20% patient coinsurance. The patient had met the deductible. The EOB shows no denial code, only a contractual adjustment. The total charge was $2,000. The contract analyst says the payer used a 50% multiple-procedure reduction instead of the contracted 75%. The patient has already paid the coinsurance shown on the EOB. The provider asks whether to appeal, adjust the patient's balance, or write off the difference.
1. Calculate the contracted allowed amount, the expected payer payment, and the underpayment. Show your work.
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Contracted allowed amount: 11403 = $800; 11402 = 75% x $600 = $450; total = $1,250. Expected payer payment at 80% = $1,000; expected patient coinsurance at 20% = $250. Actual allowed amount: $800 + $300 = $1,100. Actual payer payment at 80% = $880; actual patient coinsurance = $220. Payer underpayment = $1,000 - $880 = $120. Total underpayment = $1,250 - $1,100 = $150. Because the patient already paid $220, the corrected patient responsibility is $250, so the patient would owe $30 more after the payer reprocesses, assuming the contract permits collecting it. The practice should not write off the $150.
2. What should the appeal include, and what should the practice do about the patient's $220 payment?
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The appeal should include the contract page or fee schedule showing $600 for 11402 and the 75% multiple-procedure rule, the operative note documenting both lesions and sites, the claim with 11403 primary and 11402-51, the EOB showing the 50% reduction, and a calculation worksheet. Request reprocessing of the $150 difference, with $120 additional payer payment and a corrected patient responsibility of $250. After the corrected EOB posts, apply the patient's $220 payment, bill the $30 residual only if the contract and patient notices allow it, and issue a refund if the patient has overpaid. Do not bill the patient for the $120 payer shortfall.
3. If the payer denies the appeal and insists the 50% reduction is correct, what options remain?
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If the payer denies the appeal, review the contract's multiple-procedure language and any amendments before escalating. A second-level appeal or provider-relations complaint is appropriate if the contract clearly requires 75%. If the contract is ambiguous or the payer's policy expressly allows 50%, the practice may have to accept the lower allowed amount and write off the $150 as a contractual adjustment. The patient still cannot be billed the payer's $120 shortfall. The practice should also decide whether to renegotiate the contract language at renewal to avoid repeat underpayments.