Coverage percentage is not the whole calculation
A plan may cover the proposed service category while calculating payment from a lower-cost alternate service. The benefit percentage can be correct and the estimate can still be overstated if the alternate allowance is missed.
This is common territory for posterior composites, higher-cost crown materials, and other services where the plan document defines a least-cost alternative.
Ask for the rule and the basis
A useful verification records whether an alternate benefit applies, which service or material supplies the payment basis, and whether the payer returned an amount or only a rule. Those are different levels of certainty.
If the payer supplies only the rule, the estimate should not quietly invent the alternate allowed amount. The unresolved calculation belongs in the result.
Explain the difference before treatment
The practice can still present the clinically selected treatment. The purpose of the downgrade check is to separate the treatment fee from the amount the plan is expected to recognize.
Clear language before the visit reduces the chance that a correct payer adjudication feels like an unexpected denial to the patient.