Contractual Variance Calculator

Why a short payment does not look like one

A denial announces itself. A contractual variance does not. When a payer allows less than the contracted rate, the difference does not arrive as an unpaid balance — it arrives as a larger contractual adjustment, which posts cleanly, closes the account to a zero balance, and drops out of every follow-up queue built from open balances. The group code on the remittance certifies the category of the amount, never that the amount was correct, and there is no reason code that means “we allowed you less than your contract says”.

That is why the comparison has to come from outside the remittance. Validating contractual adjustments is the method — re-derive the expected allowed amount from the fee schedule you hold and check the reported adjustment against it, at posting, while the recovery window is widest. This calculator is that comparison for one claim. For accounts that already closed, the zero-balance review is the retrospective version.

The patient’s share is part of what the plan allowed

This is the mistake worth avoiding, because it produces confident wrong answers. The allowed amount is what the plan permitted for the service. It is then split between the plan and the patient — the plan pays its part, and the deductible, coinsurance or copay is the patient’s part of the same allowed amount.

So a line contracted at $120.00 with a 20% coinsurance pays $96.00 from the plan and $24.00 from the patient, and it was allowed exactly to contract. Comparing $120.00 against the $96.00 payment alone would report a $24.00 underpayment on a line that was paid correctly — and it would do it on every claim with any patient responsibility at all. Billed, allowed, paid works the arithmetic through in full.

One caveat on what to type into the patient column: it means the deductible, coinsurance and copay taken out of this line’s allowed amount. A non-covered charge is not part of it — the plan never allowed that money, so including it would overstate what was allowed and hide a real shortfall.

A variance is only as good as the rate you measured against

The calculator compares the payer against a number you supplied. It has no fee schedules, no benchmark, and no opinion about what a reasonable rate is — this site does not hold your contracts and will not guess at one. Before treating a result as recoverable, check that the rate you used was the one in force on the date of service, that any multiple-procedure or modifier reduction in the contract has been applied, and that the units on the line match the units the rate is quoted in. Most variances that evaporate on review evaporate for one of those three reasons.

A result in the other direction is worth just as much attention. An allowance above contract can be a fee schedule you have not loaded yet — or an overpayment the payer will recoup later, which is a very different thing to have already spent. Underpayments and overpayments covers both directions and what each one obliges you to do.

Before this, check that the claim balances at all

This tool assumes the remittance itself is internally consistent — that the charge, the payment and every adjustment add up. If they do not, the allowed amount you are comparing against is not a reliable figure to start from. The remit balancing checker tests that identity first, and it is the right order to work in: confirm the claim balances, then ask whether the amount it balanced to was the contracted one.