When a medical claim pays less than a practice expects, the first question is not whether the insurer acted unlawfully. It is whether the payment matches the applicable contract, fee schedule, patient responsibility, coding rules, and claim adjustments. A disciplined reconciliation can identify an actual underpayment, a posting error, or a legitimate contractual reduction before the practice appeals.
Start with the contract, not the deposit
A bank deposit is not a claim-level payment explanation. Retrieve the remittance advice, the original claim, the payer’s adjudicated codes, the patient’s eligibility information and the contract version applicable on the date of service. A practice with multiple tax IDs, locations or network products should verify which agreement applies. A negotiated rate for one plan may not govern a different product sold by the same insurance company.
Build a line-by-line reconciliation
For every service line, record the billed amount, allowed amount, insurer payment, deductible or coinsurance, adjustment codes, prior payments and any recoupment. Compare the allowed amount with the correct contracted fee schedule, including modifiers, place-of-service rules and multiple-procedure reductions. A payment that appears low can reflect a deductible rather than a payer shortfall. Conversely, a remittance may apply a fee schedule that does not match the governing contract.
Separate coding questions from payment questions
A coding denial, bundling edit, missing authorization, eligibility mismatch and contract underpayment require different evidence. If a procedure was downcoded, identify the clinical and coding basis and request the edit rationale. If the claim was processed out of network despite a network contract, preserve the provider directory, contract participation confirmation and plan identification. If a service was already paid, check whether a later adjustment or offset changed the net amount.
Calculate the disputed amount transparently
Use a reproducible calculation: expected allowed amount minus actual allowed amount, adjusted for contractual conditions. Do not call the difference between the billed charge and allowed amount an underpayment unless the contract supports that comparison. Where the insurer applied patient cost sharing, separately calculate what the payer owes and what the patient may owe. This prevents an inaccurate demand and avoids inappropriate patient billing.
Request a written explanation and track deadlines
Send the payer a claim-specific request identifying the control number, service date, CPT or HCPCS code, contract reference, actual allowance, expected allowance and precise amount in dispute. Ask for the relevant fee schedule or reimbursement provision and an explanation of each adjustment. Check contractual dispute windows and applicable state prompt-payment or administrative rules rather than assuming a universal deadline. Retain submission confirmations and a chronological call log.
Escalate without confusing different rights
Provider contract disputes, patient benefit appeals and federal independent-dispute-resolution processes are not interchangeable. Determine whether the practice has a contract remedy, a payer provider-relations escalation, a state regulator complaint route or another process. For self-funded employer plans, the regulatory framework may differ from fully insured coverage. Do not threaten litigation or regulatory penalties without checking the applicable rules.
What patients should know
A provider’s reimbursement dispute does not automatically make the patient responsible for the disputed balance. Patients can request an itemized bill and explanation of benefits and ask whether the practice is pursuing a contractual correction. A practice should avoid sending an unresolved contractual difference to collections as though it were established patient liability.
FAQ: What if the payer says the claim was processed correctly?
Ask for the contract clause, fee schedule version, code edit and calculation supporting that conclusion. A bare statement of correctness is not the same as a reproducible explanation. If the evidence still conflicts, use the contractual reconsideration or dispute channel before its deadline.
FAQ: Can the practice resubmit the same claim?
Sometimes a corrected claim is appropriate for an actual coding or demographic error. But repeated identical submissions can create duplicates or delays. Distinguish corrected claims from formal payment disputes, and document which route the payer requires.
For a related practical example, read this Did They Pay? guide.
Authoritative resources
See CMS explanation of remittance advice and adjustment codes for the applicable official guidance and details.
See CMS Medicare claims processing resources for the applicable official guidance and details.