Confirm the expected amount before calling it an underpayment
A suspected underpayment is a claim that paid but may have paid less than the amount due under the applicable contract and claim facts. First confirm the expected amount. Patient responsibility, a contractual adjustment, or a claim detail may explain a payment that is lower than the billed charge.
Compare the same service, contract, and date
Review the remittance alongside the correct fee schedule or contract reference for that payer, service date, code, provider, units, and modifiers. Reconcile the allowed amount, payment, adjustments, and patient responsibility. Do not compare a remittance with the wrong contract version or a different service period.
If the figures do not reconcile, classify the variance. Check whether the payer applied the expected contract, whether the claim’s code and units match the documentation, and whether a modifier, coordination detail, or other payer rule changed the result. Separate a paid-but-lower-than-expected claim from a rejection or denial; those require different workflows.
Choose and document the next action
Once a biller identifies a possible variance, they can gather the relevant records and follow the payer’s stated process. That may mean checking a portal, calling or emailing the payer, correcting a claim, or submitting an appeal or reconsideration when the facts and rules support it. The appropriate path and deadline vary by payer, contract, and claim.
Record the issue, supporting documents, contact or submission date, payer response, and next follow-up. The work may lead to a correction or additional payment, but identifying a variance does not guarantee recovery. Close the review only when the reason is understood and the claim record reflects the result.
For a broader follow-up process, see how often unpaid claims should be worked. A denied claim follows a different path; see common physical therapy claim denial root causes.
A quick owner review
Ask whether the suspected amount was compared against the correct contract, whether the payer explained the variance, who owns the next action, and when it is due. Do not equate billed charges with contracted reimbursement or count a potential recovery before it appears in the payment record.