Underpaid Claims Recovery for Med Spas: Checklist

An underpaid claim is a claim the payer paid, but for less than your contract or the payer's fee schedule allows once the patient's deductible, coinsurance and copay are accounted for. Recovering it takes five steps: pull the contract and fee schedule that applied on the date of service, compare the expected allowed amount with the remittance line by line, confirm the gap is not a contractual or patient-responsibility adjustment, send the payer a dispute or appeal with the evidence, and track every deadline until it is paid or closed.

Quick reference for reading the remittance:

• Denied claim: nothing paid; appeal the denial.
• Underpaid claim: paid, but the allowed amount is below the contracted amount.
• CO-45: "charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement." Usually a normal contractual write-off, not an underpayment.
• PR-1, PR-2, PR-3: deductible, coinsurance and copay. These belong to the patient.
• PR-96 or CO-96: non-covered charges. Check the remark code and the patient's plan before treating it as an underpayment.
• Medicare: request a redetermination within 120 days of receiving the remittance advice; the MAC can also reopen a claim for clerical errors.

Sources checked October 14, 2026 · Prepared by Prospyr. No certified-coder review is claimed. CPT is a registered trademark of the American Medical Association; use the current licensed code set.

Most aesthetic services are self-pay. This checklist applies to the services you do bill to insurance.

Checklist 1: Gather contracts, fee schedules and payment data

Documents for each payer

• The signed provider agreement and every fee schedule exhibit
• Amendments that changed rates or added codes, with effective dates
• Proof the contract was active on the date of service
• The payer's dispute, reconsideration and appeal instructions, including where to send them and the deadline

Keep a payer table:

Some contracts pay the lesser of your billed charge or the contracted rate. If the charge you entered is below the contract rate, a low payment may be correct.

Payment data to export

Export recent ERAs, EOBs and claim-line reports. Each row should be one claim line with:

• patient account number, date of service and payer
• CPT or HCPCS code, modifiers and units
• billed, allowed and paid amounts
• adjustment group and reason codes
• patient responsibility

Sort the adjustment codes into plain buckets: contractual adjustment, patient responsibility, non-covered and possible underpayment.

Checklist 2: Compare expected and actual payment

1. Calculate the expected allowed amount from the fee schedule in effect on the date of service. Write it down before you look at the payment.
2. Apply the lesser-of rule if your contract has one.
3. Apply payer rules that legitimately lower payment, such as multiple-procedure reductions, only when the payer's policy supports them.
4. Compare expected allowed with actual allowed. Treat a line as an underpayment candidate only when the actual allowed is lower than expected after patient responsibility is set aside.
5. Set a dollar threshold for follow-up based on the cost of your team's time, and review high-value lines even when the gap is small.

Route each variance by cause

Checklist 3: Build the packet and contact the payer

Assign owners

Packet contents

• Claim summary: claim number, patient identifier, provider, payer and date of service
• Original claim and any corrected claim
• Line-by-line expected versus paid calculation
• ERA or EOB showing the adjustment codes
• The fee schedule page or amendment that sets the rate
• Payer policy or coding guidance for coding disputes
• The relevant part of the note, for documentation disputes
• A short cover letter stating the amount you are asking the payer to correct

Send only the PHI the dispute needs.

Log every contact

For each call: date, time, department, representative name, call reference number, what was agreed and the next promised step. For each submission: date, method, destination, confirmation number and who sent it.

Checklist 4: Follow up and track results

• Record each claim's dispute deadline from the payer's own rules, and set reminders well before it.
• Follow up on a fixed schedule, for example 30 days after submission, then escalate to provider relations if the payer stalls.
• For Medicare claims, if a redetermination is unfavorable, the next level is reconsideration by a Qualified Independent Contractor, requested within 180 days of receiving the redetermination.

Track for each claim: payer, claim number, date of service, billed, expected, allowed and paid amounts, underpaid amount, owner, deadline, last contact, next action and amount recovered. Close each one as recovered, partly recovered, written off or closed.

Then look for patterns by payer, code and variance type. A repeat rate error usually means a fee schedule loaded wrong on the payer's side or yours; fixing it stops future underpayments.

Where Prospyr fits

Prospyr does not submit insurance claims, post remittances or verify reimbursement. It supports charting, digital intake, inventory and practice operations. Practices that bill insurance heavily need a separate claims solution.

Sources

• X12 Claim Adjustment Reason Codes
• CMS: First level of appeal, redetermination by a Medicare contractor
• CMS Medicare Claims Processing Manual, Chapter 29 (Appeals)
• CMS Medicare Claims Processing Manual, Chapter 34 (Reopening and Revision)