Recoupment is when a payer takes back money it already paid you, usually by withholding it from your future payments instead of waiting for a refund check.
Every practice that bills insurance eventually sees one. A remittance arrives smaller than the claims it covers, and somewhere on the 835 is a provider-level adjustment that pulls back a payment from months ago. If nobody on your team recognizes it, the deposit never reconciles, and the original claim still looks paid in full.
Medicare follows a fixed, regulated timeline for overpayment demands, with specific windows that decide whether money is withheld and whether interest accrues. Commercial payers follow their contracts and state law, which vary widely. Knowing which rules apply, and acting inside the deadlines, is the difference between a controlled repayment and a surprise hole in your cash flow.
This guide explains recoupment vs offset vs refund, the Medicare overpayment timeline day by day, how to stop recoupment with a timely appeal, how recoupments appear on the 835, and what the 60-day overpayment rule requires when you find the error yourself.
Key Takeaways
- In Medicare terms, recoupment recovers a Medicare debt from future Medicare payments; offset recovers a non-Medicare federal debt the same way; a refund is money you send back yourself.
- After a Medicare demand letter, interest starts on day 31 if the debt is not paid, and recoupment starts on day 41 unless you pay, set up an extended repayment schedule or file a valid appeal.
- A redetermination received by day 30 stops recoupment before it begins; a reconsideration filed within 60 days of the redetermination decision keeps it stopped. An ALJ request does not stop recoupment.
- On the 835, recoupments usually appear in the PLB segment with adjustment code WO, often alongside a reversed claim (CLP02 = 22).
- Since 1 January 2025, the 60-day rule ties “identified” to the False Claims Act knowledge standard and allows up to 180 days for a timely, good-faith investigation.
Recoupment vs Offset vs Refund
The three terms are often used interchangeably, but Medicare regulations define them differently, and the difference matters when you read a demand letter.
| Term | Who starts it | What happens | Typical example |
|---|---|---|---|
| Recoupment | Payer | An outstanding debt to that program is recovered by reducing present or future payments | Medicare withholds a prior overpayment from this week’s remittance |
| Offset | Payer | In Medicare usage, a non-Medicare federal debt is recovered from Medicare payments | A debt owed to another federal program is taken from Medicare payments |
| Refund | Provider | The provider returns the money voluntarily, by check or claim adjustment | Your team finds a duplicate payment and sends it back |
| Commercial offset | Payer | Contract language lets the plan net an overpayment against later claims | A plan reduces a new check by the amount of an old overpayment |
Commercial payers usually say “offset” for what Medicare calls recoupment. In practice, ask one question: is the money coming out of future payments (recoupment or offset) or are you sending it back (refund)?
Why Payers Recoup Payments
Most recoupments trace back to a handful of root causes. Several are preventable at the front desk or in charge review.
- Coordination of benefits changes. A payer learns another plan was primary and takes its payment back. See our guide to coordination of benefits in medical billing, and the Medicare Secondary Payer rule for Medicare cases.
- Retroactive eligibility termination. Coverage ended before the date of service and the plan updated its file later.
- Duplicate payments. The same service was paid twice, often after a corrected claim was processed as a new claim. Our CO-18 duplicate claim guide explains how to prevent this.
- Audit and medical review findings. Documentation did not support the level of service, units or medical necessity.
- Retroactive fee schedule or rate corrections. The payer reprocesses claims at a corrected rate.
- Payer system errors. The payer overpaid because of its own setup mistake.
The Medicare Overpayment Timeline, Day by Day
Section 935 of the Medicare Modernization Act added section 1893(f)(2) to the Social Security Act, which limits when Medicare can recoup an overpayment while an appeal is pending. MACs such as First Coast and Noridian publish the resulting timeline, counted from the date of the demand letter.
| Day | What happens | Your options |
|---|---|---|
| Day 1 | The MAC issues the initial demand letter | Review the claims and amounts listed |
| Days 1–15 | Rebuttal window | Submit a rebuttal explaining why recoupment should not start; a rebuttal is not an appeal and may not stop collection |
| Days 1–30 | No interest if paid in full | Pay in full, or file a redetermination received by day 30 to stop recoupment before it starts |
| Day 31 | Interest begins to accrue on the unpaid balance | Interest is assessed from the demand letter date until the debt is resolved |
| Day 41 | Recoupment begins from future payments | Unless you paid, have an approved extended repayment schedule or filed a valid appeal |
| Day 120 | Last day to request a redetermination | A later request is not accepted; a request after day 30 stops further recoupment but does not refund amounts already taken |
How Limitation on Recoupment Works
- Redetermination (level 1). A valid redetermination request received by the MAC within 30 days of the demand letter stops recoupment before it begins. Filed later, but within 120 days, it stops further recoupment, but money already withheld stays applied.
- Reconsideration (level 2). If the redetermination upholds the overpayment, file a reconsideration with the Qualified Independent Contractor within 60 days of the redetermination notice to keep recoupment stopped.
- ALJ and beyond (levels 3–5). Requesting an Administrative Law Judge hearing does not stop recoupment. Collection resumes after the QIC level.
- If you win later. If the overpayment is overturned at the ALJ level or higher, Medicare refunds the amounts collected and pays “935 interest” on principal it recouped through involuntary withholding, not on amounts you paid by check or through an extended repayment schedule.
Do not treat a rebuttal as an appeal. Only a valid, timely redetermination or reconsideration stops Medicare recoupment. A rebuttal is a separate, informal statement and Medicare may continue collecting.
Note that interest continues to accrue during the appeal. If you lose, the interest is owed; if you win, principal and interest collected are refunded. For appeal mechanics and letter structure, see our medical claim appeal process guide.
Worked Example: A Medicare Demand Letter
Assume a hypothetical demand letter dated 2 March for $1,840 across 12 claims after a post-payment review of E/M levels.
Option A: pay by 1 April (day 30). You return $1,840, no interest is charged, and the debt closes. You keep the right to appeal within 120 days.
Option B: file a redetermination received by day 30. No money is withheld while the MAC reviews the claims. Interest accrues from the demand date, and is refunded if you win.
Option C: do nothing. Interest begins on day 31 and, from day 41, the MAC withholds future payments until $1,840 plus interest is recovered. The withheld amount appears on your remittances as a provider-level adjustment.
How Recoupments Appear on the 835
Recoupments are hard to post because the money is often taken at the provider level, not on the claim it relates to. The 835 PLB (provider level balance) segment carries these adjustments. A positive PLB amount reduces the payment; a negative amount increases it. Payer companion guides, such as UnitedHealthcare’s and BCBS’s, describe these common codes:
| PLB code | Name | What it usually means for posting |
|---|---|---|
| WO | Overpayment recovery | Money taken back for a prior overpayment; the reference ID points to the original claim |
| FB | Forwarding balance | An amount carried to or from another remittance, often when a recovery exceeds the current payment |
| 72 | Authorized return | Acknowledges money you refunded to the payer |
| CS | Adjustment | A general adjustment, such as a reissued check or the offset to a forward balance |
| L6 | Interest owed | Prompt-pay interest the payer is paying you; it increases the deposit |
| IR | Internal Revenue Service withholding | Payment sent to the IRS for a tax levy |
A payer that recovers immediately may instead reverse the original claim on the same 835 (CLP02 claim status 22, reversal of previous payment) and send a corrected claim. Either way, post the recovery against the original claim and date of service, not as a lump-sum adjustment.
Example. Claims paid on this 835 total $5,000.00. PLB WO is $1,840.00, referencing the original claim numbers. The deposit is $5,000.00 − $1,840.00 = $3,160.00. Post $5,000 to the current claims and reverse $1,840 on the original claims, and the bank deposit will reconcile.
Unposted recoupments are one of the main reasons deposits fail to reconcile. Our article on how inaccurate payment posting warps practice financials shows a daily reconciliation routine, and our contractual adjustment guide explains why a recoupment must never be posted as a write-off.
The 60-Day Overpayment Rule
When your practice finds a Medicare overpayment first, the obligation shifts to you. Federal overpayment rules require providers to report and return a Medicare Part A or Part B overpayment by the later of 60 days after it is identified or, if applicable, the due date of the related cost report. The rule covers overpayments identified within six years of receipt. Retaining an overpayment past the deadline can create False Claims Act liability.
The CY 2025 Physician Fee Schedule final rule, effective 1 January 2025, changed two things:
- When an overpayment is identified. CMS replaced the old “reasonable diligence” standard. An overpayment is now identified when you have actual knowledge of it or act in deliberate ignorance or reckless disregard of it, the False Claims Act definition of “knowingly.”
- Time to investigate. If you identify one overpayment and run a timely, good-faith investigation into related overpayments, the 60-day deadline is suspended until the investigation ends or 180 days after the first overpayment was identified, whichever comes first.
Do not wait for a demand letter once you know an overpayment exists. Return it through your MAC’s voluntary refund process with the claim details, and keep a record of your investigation and refund.
How Far Back Can Medicare Go?
Under Medicare’s reopening rules, a contractor may reopen a claim within one year of the initial determination for any reason, within four years for good cause, and at any time where there is reliable evidence of fraud or similar fault. Your own obligation under the 60-day rule looks back six years.
Commercial Payer Recoupment and State Law
Commercial plans recoup under the terms of their provider agreements, and many states regulate the practice through insurance or prompt-pay laws. In general terms, those laws often:
- limit how long after payment an insurer may seek recoupment, except in cases of fraud or duplicate payment;
- require written notice that identifies the patient, claim, amount and reason;
- give the provider a period to dispute before any offset is taken.
The time limits and notice rules vary by state, and self-funded ERISA plans are often outside state insurance law. Check your contract and your state insurance department’s rules before you accept or dispute a commercial recoupment. If the request is wrong, a written dispute with the claim history usually works faster than a phone call, and our denial management team handles these disputes daily.
How to Respond to Any Recoupment Request
- Log the date. Record the demand or notice date; every deadline runs from it.
- Match every claim. Pull the original claim, remittance and documentation for each line listed.
- Classify it. Decide whether it is valid (refund or accept the offset), partly valid or wrong (appeal or dispute).
- Act inside the window. For Medicare, file the redetermination so it is received by day 30 if you plan to appeal.
- Post it correctly. Reverse the payment on the original claim and rebill any correct payer, such as the true primary plan after a COB recoupment.
- Fix the cause. Update eligibility, COB, coding or charge entry so the same issue does not repeat.
Facing a large Medicare demand or a commercial takeback you think is wrong? Steady Medical Billing’s medical claims recovery services review every recouped claim, file timely appeals and post the adjustments so your books reconcile.
Frequently Asked Questions
What is recoupment in medical billing?
Recoupment is when a payer recovers money it previously paid a provider, usually by withholding it from future payments. It most often follows coordination of benefits changes, duplicate payments, retroactive eligibility changes or audit findings.
How do I stop Medicare from recouping an overpayment?
Pay the debt, set up an extended repayment schedule, or file a valid redetermination. A redetermination received within 30 days of the demand letter stops recoupment before it starts on day 41. A reconsideration filed within 60 days of the redetermination decision keeps it stopped. An ALJ request does not.
Does Medicare charge interest on overpayments?
Yes. If the debt is not paid in full within 30 days of the demand letter, interest accrues from the demand letter date until the debt is resolved, even during an appeal. If the overpayment is overturned, collected principal and interest are refunded.
What is the 60-day overpayment rule?
Providers must report and return an identified Medicare overpayment within 60 days, or by the cost report due date if later. Since 1 January 2025, identified follows the False Claims Act knowledge standard, and a timely good-faith investigation can suspend the deadline for up to 180 days.
How far back can a commercial insurer recoup a payment?
It depends on your contract and state law. Many states limit the lookback period and require written notice and a chance to dispute, with exceptions for fraud. Self-funded ERISA plans may not be subject to those state rules.
