Section 935 Rebuttal Rights: How to Delay Recoupment While Your Appeal Is Pending

When a Medicare Administrative Contractor (MAC) issues an overpayment demand, providers often hear about "935 rights" and "rebuttal rights" in the same breath. The terms are related, but they are not the same, and confusing them can cost a provider its protection against recoupment.

Section 935 of the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 added important protections to the Social Security Act. Among them, it limits the ability of Medicare to recoup overpayments while a provider's first- and second-level appeals are pending, and it requires Medicare to pay interest to providers that ultimately win appeals on recouped amounts at the ALJ level or later. Separately, Medicare's regulations give providers the right to submit a rebuttal statement within 15 days of a demand letter.

This article explains what Section 935 does, how the rebuttal right works, why a rebuttal does not stop recoupment, how to use timely appeals to delay recoupment, what happens at each appeal level, how 935 interest works, and common mistakes. It is educational and does not replace legal advice.

What Is Section 935?

Section 935 of the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 added several provisions to Section 1893(f) of the Social Security Act, including:

• Section 1893(f)(1), which authorizes extended repayment schedules when repaying an overpayment within 30 days would cause hardship.

• Section 1893(f)(2), which limits recoupment of overpayments while certain appeals are pending and provides for interest on recouped amounts if the provider prevails at later levels.

• Section 1893(f)(3), which limits the use of extrapolation to situations involving a sustained or high level of payment error or failed educational intervention.

CMS implemented the limitation on recoupment at 42 CFR 405.379, and its Medicare Financial Management Manual, Chapter 3, Section 200, titled Limitation on Recoupment (935) for Providers, Physicians, and Suppliers, provides detailed instructions to MACs.

The Rebuttal Right

What the Regulation Provides

Under 42 CFR 405.374, providers and suppliers generally have an opportunity to submit a rebuttal statement before recoupment or offset is put into effect. CMS's Medicare Overpayments fact sheet explains that a rebuttal may be submitted within 15 calendar days from the date of the MAC's demand letter, that it should explain why recoupment should not happen and provide supporting evidence, and that the MAC evaluates it promptly.

What a Rebuttal Is For

A rebuttal is useful for issues such as:

• The overpayment was already repaid.

• The overpayment was calculated incorrectly.

• The demand was issued to the wrong provider or for the wrong claims.

• There is a clear administrative or processing error.

What a Rebuttal Is Not

CMS states clearly that a rebuttal is not an appeal and does not stop recoupment. A rebuttal does not extend appeal deadlines, and it does not trigger the Section 935 limitation on recoupment. MAC guidance has explained that only a valid and timely request for redetermination stops collection of overpayments subject to the limitation.

Rebuttals in Payment Suspensions

Providers may also encounter rebuttal rights in the context of payment suspensions under 42 CFR 405.372. A payment suspension rebuttal is a separate process with its own rules and timeframes. If your payments have been suspended, involve legal counsel promptly.

How the Limitation on Recoupment Works

The Core Rule

CMS's Medicare Overpayments fact sheet explains that under Section 1893(f)(2)(A) of the Social Security Act, when a MAC receives a valid first- or second-level appeal, subject to certain limitations, it cannot recoup until an appeal decision is issued.

Which Overpayments Are Covered

The limitation generally applies to fee-for-service claim overpayments for which a redetermination may be requested. Some overpayments, such as certain cost report overpayments, are not subject to the limitation and follow different recoupment rules. Check the demand letter.

The Timeline

CMS's fact sheet describes the following key dates for overpayments subject to the limitation:

• Day 15: Last day to submit a rebuttal.

• Day 30: Last day to pay in full to avoid interest, and last day to file a redetermination to prevent recoupment on Day 41.

• Day 31: Interest begins to accrue on unpaid balances.

• Day 40: Last day to pay in full before recoupment begins.

• Day 41: Standard recoupment begins unless the overpayment is in an excluded category, such as an appeal, a requested or approved extended repayment schedule, or bankruptcy.

• Day 120: Last day to submit a redetermination request.

How to Delay Recoupment at Each Appeal Level

Level 1: Redetermination Within 30 Days

To prevent recoupment from beginning on Day 41, file a valid redetermination request so that it is received and validated by the MAC within 30 days of the date of the demand letter. CMS's Section 935 training materials emphasize that the appeal request must be received and validated by the 30th day. CMS's manual instructions direct MACs to update their systems in time to avoid systematic recoupment on Day 41 when a valid redetermination is received.

If You File After Day 30

CMS's fact sheet explains that if you file an appeal after Day 30 and by Day 120, the MAC must stop recoupment of overpayments subject to the limitation once it receives and validates the appeal, but it will not refund money already recouped until the redetermination is decided. CMS's manual instructs MACs not to refund recoupments that occur on Day 41 or later and to apply those amounts to the overpayment.

After an Unfavorable Redetermination

If the redetermination is unfavorable or partially favorable, recoupment may resume unless you file a reconsideration within 60 days of the redetermination decision. Filing within 60 days continues the limitation on recoupment during the reconsideration.

Level 2: Reconsideration Within 60 Days

File the reconsideration with the Qualified Independent Contractor (QIC) and notify the MAC as required so that it can maintain the stop on recoupment. Some MACs ask providers to send a copy of the reconsideration request or confirmation so they can update their systems. Check your MAC's instructions.

After the Reconsideration

The limitation on recoupment applies only during the first two levels of appeal. After the QIC issues its reconsideration decision, recoupment may begin even if you request an ALJ hearing.

Levels 3 Through 5

There is no limitation on recoupment at the ALJ, Council, or federal court levels. However, if the provider ultimately prevails at the ALJ level or later, Section 935 interest may be payable on amounts that were recouped.

What Makes a Redetermination "Valid"

For the limitation to apply, the MAC must be able to validate the redetermination request. Under 42 CFR 405.944, a redetermination request must include:

• The beneficiary's name.

• The Medicare number.

• The specific service or item and date of service.

• The name and signature of the party or the party's representative.

For overpayments, also include the demand letter, the accounts receivable number, and a clear statement that you are appealing the overpayment. If a representative files on your behalf, make sure the representation is properly documented. Incomplete requests may not be validated in time to stop recoupment.

Section 935 Interest

What It Is

Section 1893(f)(2)(B) of the Social Security Act provides that if a provider's overpayment determination is reversed at the ALJ level or a later level, Medicare pays interest on the amounts recouped. CMS's manual explains how MACs calculate this interest for each 30-day period and how it is paid after favorable decisions.

Which Payments Qualify

CMS's manual explains that Section 935 interest applies only to overpayments recovered through involuntary recoupment under the limitation on recoupment provisions. MAC guidance has explained that if a provider pays an overpayment by check, under an extended repayment schedule, or through immediate offsets it requested, Section 935 interest does not apply.

Strategic Implications

This creates a trade-off for providers with strong appeals and the ability to absorb recoupment:

• Paying voluntarily avoids interest owed to Medicare if the provider loses, and may be necessary for cash flow planning.

• Allowing involuntary recoupment after the QIC decision may preserve the right to Section 935 interest if the provider wins at the ALJ level or later.

The right choice depends on the strength of the appeal, the size of the overpayment, the provider's financial position, and the expected time to decision. Consider discussing the decision with financial advisors and counsel.

Interest Owed by the Provider

Separately, interest owed by the provider to Medicare continues to accrue on unpaid overpayments under 42 CFR 405.378, beginning on Day 31, whether or not an appeal is filed. CMS's fact sheet confirms that interest accrues regardless of appeal status. If the provider wins, the overpayment and associated interest are adjusted.

Excluded Categories

CMS identifies categories that prevent standard recoupment, including:

• A requested or approved extended repayment schedule.

• An appeal of an overpayment subject to the limitation on recoupment, in redetermination or reconsideration status.

• Bankruptcy.

Understanding these categories helps providers use the right tools to delay recoupment.

Combining Rebuttal, Appeal, and ERS

Providers often use more than one tool:

• Rebuttal for administrative errors, submitted within 15 days.

• Redetermination for substantive disagreements, filed within 30 days to stop recoupment.

• Extended repayment schedule for undisputed amounts, or for amounts that may be recouped after the QIC decision.

For example, a provider might submit a rebuttal identifying a calculation error, file a redetermination for claims it disputes, and request an ERS for the portion it does not dispute.

Monitoring Recoupment

• Confirm that the MAC validated your appeal and placed the overpayment in appeal status.

• Review remittance advice for provider-level adjustments that indicate recoupment.

• Watch for remark codes associated with the limitation on recoupment, such as N469.

• Contact the MAC promptly if recoupment occurs on an overpayment that should be protected.

• Track when the QIC decision is issued, since recoupment may begin afterward.

A Step-by-Step Section 935 Checklist

1. Log the demand letter the day it arrives and note its date.

2. Calculate Day 15, Day 30, Day 40, Day 41, and Day 120.

3. Review the claims and identify administrative errors and substantive disagreements.

4. Prepare and submit any rebuttal by Day 15.

5. Prepare a complete redetermination request with all required elements and supporting evidence.

6. Submit the redetermination electronically, if possible, so it is received and validated well before Day 30.

7. Confirm with the MAC that the overpayment is in appeal status.

8. Monitor remittance advice to confirm recoupment has not begun.

9. When the redetermination decision arrives, calculate the 60-day reconsideration deadline.

10. File the reconsideration within 60 days and notify the MAC as required.

11. Plan for recoupment after the QIC decision, including whether to request an extended repayment schedule.

12. If continuing to the ALJ, track recouped amounts so Section 935 interest can be verified if you win.

How RAC Discussion Periods Fit In

For overpayments identified by Recovery Audit Contractors, providers may have an opportunity to discuss findings with the RAC before or after the demand letter is issued. A discussion with the RAC is not an appeal and does not trigger the limitation on recoupment. If you are pursuing a RAC discussion, still file a timely redetermination within 30 days of the MAC's demand letter if you want to prevent recoupment.

Working With Your MAC

MACs process thousands of overpayments and appeals, so clear communication helps:

• Use the MAC's portal or esMD to submit appeals when possible, so receipt dates are documented.

• Reference the accounts receivable number and demand letter date in every communication.

• Ask the MAC to confirm that the appeal was validated and the overpayment placed in appeal status.

• Keep records of every call, including the date, time, representative name, and reference number.

• Escalate promptly if recoupment occurs on a protected overpayment.

Section 935 and Different Types of Overpayments

The limitation on recoupment generally applies to claim-based fee-for-service overpayments that can be appealed through the redetermination process. Other types of overpayments may follow different rules:

• Certain Part A cost report overpayments are not subject to the limitation and may follow different recoupment schedules. CMS has issued instructions aligning the default recoupment date for certain cost report overpayments with the Day 41 schedule used for claim overpayments.

• Overpayments in bankruptcy are handled under bankruptcy rules.

• Overpayments identified during payment suspensions may involve separate procedures.

Read your demand letter carefully, because it states whether the overpayment is subject to the limitation on recoupment.

Common Mistakes

• Treating a rebuttal as an appeal.

• Filing the redetermination on Day 30 by mail and having it arrive late.

• Submitting an incomplete redetermination that the MAC cannot validate in time.

• Missing the 60-day reconsideration window and losing protection at Level 2.

• Assuming recoupment protection continues at the ALJ level.

• Not considering how voluntary payments affect Section 935 interest.

• Forgetting that interest owed to Medicare continues during appeals.

• Not monitoring remittance advice for unexpected recoupment.

Key Dates at a Glance

• Day 15: Rebuttal deadline. A rebuttal does not stop recoupment.

• Day 30: Redetermination must be received and validated to prevent recoupment on Day 41. Last day to pay in full without interest.

• Day 31: Interest begins.

• Day 41: Standard recoupment begins unless excluded.

• 60 days after the redetermination decision: Reconsideration deadline to continue limiting recoupment.

• After the QIC decision: Recoupment may begin.

• After a favorable ALJ or later decision: Recouped amounts are refunded, and Section 935 interest may be paid on involuntarily recouped amounts.

Who Should Be Involved

• Billing and reimbursement staff to review claims and amounts.

• Clinical and coding reviewers to evaluate the merits of the denials.

• Finance leaders to model recoupment and consider ERS options.

• Compliance staff to evaluate broader implications.

• Legal counsel for large, extrapolated, or investigation-related overpayments.

A Hypothetical Example

A hospital receives a demand letter dated March 1 for a $400,000 overpayment resulting from a RAC review of inpatient claims. It identifies that $15,000 of the overpayment relates to claims that were already adjusted and repaid. On March 10, it submits a rebuttal identifying those claims with supporting documentation. On March 20, it files a redetermination for the remaining claims through the MAC portal and confirms validation. Recoupment does not begin on Day 41.

The redetermination is unfavorable for most claims. The hospital files a reconsideration within 60 days, continuing the limitation. After the QIC upholds most of the overpayment, recoupment begins. The hospital decides to allow recoupment rather than entering an ERS, because its cash position can absorb it and it believes its ALJ appeal is strong. When the ALJ later reverses a large portion of the overpayment, the MAC refunds the recouped amounts and pays Section 935 interest on those amounts.

Frequently Asked Questions

Does a rebuttal stop recoupment?

No. CMS states that a rebuttal is not an appeal and does not stop recoupment.

How do I stop recoupment?

File a valid redetermination that is received and validated within 30 days of the demand letter. Then file a reconsideration within 60 days of the redetermination decision to continue protection.

Does Section 935 protect me at the ALJ level?

No. The limitation on recoupment applies during the first two appeal levels. However, Section 935 interest may be paid if you win at the ALJ level or later on amounts involuntarily recouped.

Will I get money back if recoupment started before I filed my appeal?

If you file after Day 30, recoupment stops once the appeal is validated, but amounts already recouped are not refunded until the redetermination is decided.

Does interest stop while I appeal?

No. Interest owed to Medicare continues to accrue during appeals.

Can I file a rebuttal and a redetermination at the same time?

Yes. A rebuttal can address administrative errors while a redetermination challenges the substance of the overpayment. Do not let a rebuttal delay your redetermination.

What if the MAC does not validate my redetermination by Day 30?

Contact the MAC immediately. If your request was received on time but not validated, ask the MAC to correct its records. Keep proof of the date your request was received.

Does Section 935 apply to self-reported overpayments?

Self-reported overpayments are handled under the 60-day report and return rule rather than the contractor demand and appeal process. Discuss your specific situation with your MAC and counsel.

Conclusion

Section 935 gives providers meaningful protection against recoupment while they appeal Medicare overpayments, but only if they use it correctly. The 15-day rebuttal is valuable for correcting administrative errors, but it does not stop recoupment. The real protection comes from filing a valid redetermination within 30 days of the demand letter and a reconsideration within 60 days of the redetermination decision. After the QIC decision, recoupment may begin, but Section 935 interest may be paid if the provider later wins on involuntarily recouped amounts. By understanding these rules, filing on time, monitoring recoupment, and weighing the trade-offs of voluntary payment, providers can protect both cash flow and appeal rights.

How HealthBridge Can Help

HealthBridge is a healthcare management consulting firm that helps providers analyze overpayment demands, prepare rebuttals and timely redeterminations, maintain recoupment protection through the first two appeal levels, evaluate ERS and payment strategies, and track Section 935 interest on favorable decisions. If you need help protecting your payments while you appeal, please get in touch with us. We will be happy to help you with this topic.

References

• Centers for Medicare & Medicaid Services. Medicare Overpayments (MLN006379). https://www.cms.gov/Outreach-and-Education/Medicare-Learning-Network-MLN/MLNProducts/downloads/overpaymentbrochure508-09.pdf

• Centers for Medicare & Medicaid Services. Medicare Financial Management Manual, Chapter 3, Section 200, Limitation on Recoupment (935). https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/fin106c03.pdf

• Centers for Medicare & Medicaid Services. CMS Manual System, Pub. 100-06, Transmittal 311 (Limitation on Recoupment Updates). https://www.cms.gov/regulations-and-guidance/guidance/transmittals/2019downloads/r311fm.pdf

• Centers for Medicare & Medicaid Services. CMS Manual System, Pub. 100-06, Transmittal 12509 (Limitation on Recoupment and 935 Interest). https://www.cms.gov/files/document/r12509fm.pdf

• Centers for Medicare & Medicaid Services. Section 935 Recoupment Training Materials. https://www.cms.gov/Research-Statistics-Data-and-Systems/Monitoring-Programs/Recovery-Audit-Program/Downloads/Section935Recoupment.pdf

• Federal Register. Medicare Program; Limitation on Recoupment of Provider and Supplier Overpayments, Final Rule (September 16, 2009). https://www.govinfo.gov/content/pkg/FR-2009-09-16/pdf/E9-22166.pdf

• Electronic Code of Federal Regulations. 42 CFR 405.372, Proceeding for Suspension of Payment. https://www.ecfr.gov/current/title-42/section-405.372

• Electronic Code of Federal Regulations. 42 CFR 405.374, Opportunity for Rebuttal. https://www.ecfr.gov/current/title-42/section-405.374

• Electronic Code of Federal Regulations. 42 CFR 405.378, Interest Charges on Overpayment and Underpayments. https://www.ecfr.gov/current/title-42/section-405.378

• Electronic Code of Federal Regulations. 42 CFR 405.379, Limitation on Recoupment of Provider and Supplier Overpayments. https://www.ecfr.gov/current/title-42/section-405.379

• Electronic Code of Federal Regulations. 42 CFR 405.944, Place and Method of Filing a Request for a Redetermination. https://www.ecfr.gov/current/title-42/section-405.944

• U.S. Social Security Administration. Social Security Act, Section 1893, Medicare Integrity Program. https://www.ssa.gov/OP_Home/ssact/title18/1893.htm