By Peter Suarez, Esq., President, Vitale, Suarez & Associates, P.A. · Miami Lakes, Florida
A Medicare redetermination request is not a protest letter. It is the first filing in an evidentiary record that every later level will read, and it is the filing that decides whether recoupment starts on the 41st day or waits.
If you manage billing, compliance, or operations for a practice, clinic, laboratory, or facility that received a Medicare overpayment demand, you need to know four things before you draft anything: who decides the request, what the request must contain, how long you have to file it, and what the contractor does with the money while it decides.
In plain terms, a redetermination is the first level of appeal under the Medicare Part A and Part B process in 42 C.F.R. Part 405, Subpart I. The Medicare contractor named in your notice reviews its own initial determination. It is the level at which the record starts. The article on the Medicare overpayment appeal process shows how the five levels fit together.
Why the First Appeal Sets the Record for the Rest
Providers often treat the redetermination as a formality to get through before the real appeal. The rules do not support that view.
The reconsideration rule requires you to present the evidence and arguments that support your position, including any documentation the redetermination notice identified as missing (42 C.F.R. § 405.966(a)). Evidence you do not present before the notice of reconsideration cannot be considered later unless you show good cause (§ 405.966(a)(2)). The documentation that goes in at level one is the documentation that level two starts from.
By the time you reach the QIC, the first record is already written. A thin redetermination request does not only risk a loss at the first level. It leaves you rebuilding the file while the evidence cutoff approaches.
The request also controls the cash. Under 42 C.F.R. § 405.379(d)(1), a valid, timely redetermination request stops recoupment from starting. That is a different benefit from prevailing on the appeal, and it depends on the request being valid and on time, not on its merit.
What You Need Before You File
A redetermination request that starts without the underlying documents is a draft of an argument, not a filing. Gather the following before the first sentence is written. If your policy says every denial notice is calendared on receipt but the notice sits in a shared mailbox, the control exists on paper only.
- The notice itself, and proof of when you received it. The 120 days run from receipt of the notice of the initial determination, and the rule presumes receipt five calendar days after the date on the notice unless you show otherwise (42 C.F.R. § 405.942(a)). The envelope, portal record, or transmittal is the proof.
- The identity of the contractor named in the notice. The request goes to that contractor (42 C.F.R. § 405.944).
- The list of claims at issue. The beneficiary, the Medicare number, the services, and the dates of service for every claim the determination covers.
- The medical records and billing documentation for those claims. Complete, in the form the contractor can review, with the audit trail preserved.
- The reason you disagree. Stated claim by claim where the determination is claim by claim, and by methodology where the determination rests on a sample.
- The identity of the person filing. The party or its representative, and the authority to act.
If you are missing any of these, the missing item is the first task. A request filed on time with an incomplete record can protect the pause without protecting the argument.
What the Request Must Contain
Under 42 C.F.R. § 405.944, a request for redetermination is filed with the contractor named in the notice, in writing, and the rule prefers the standard CMS form. If you do not use the form, the request must still identify the beneficiary’s name, the Medicare number, the service or services and the date or dates of service, and the name of the party or its representative.
Those are the minimum identification elements the rule requires. They are not the whole of a good request. A request that identifies the claims and states only that you disagree gives the contractor nothing to evaluate. A request that identifies the claims, states the reason for each disagreement, and attaches the supporting records gives the contractor a record it can decide.
If several parties file timely requests on the same claim, the contractor consolidates them into one redetermination (42 C.F.R. § 405.944(c)). If more than one person in your organization could file, decide who files and send one request.
How to Build the Argument Section
The rule requires identification elements. It does not tell you how to persuade, and the contractor’s reviewer reads many requests that state only that the provider disagrees. The argument section is where your request separates from those.
Where the determination is claim by claim, tie each argument to the specific claim, the date of service, and the page of the record that supports it. A statement that the documentation supports medical necessity is a conclusion. A statement that points to the signed order, the visit note, and the date of each is a record.
Where the determination rests on a statistical sample, argue the methodology as well as the claims. A provider may believe it is defending a handful of charts when it is in fact defending the basis for a demand projected across many more claims. The request should say so, and it should preserve the methodological objections for the levels that follow.
Where the facts are contested, say what the record shows and no more. Do not characterize intent, do not explain internal practices that the records do not document, and do not offer reasons that you cannot support with a document. A request is part of the evidentiary file, and an explanation that goes beyond the records can become the next finding.
How to File a Medicare Redetermination Request
Step 1: confirm the deadline from the notice you hold
Identify the notice as the notice of an initial determination. Count 120 calendar days from the date you received it, using the receipt date you can prove (42 C.F.R. § 405.942(a)). If the only date you hold is the date on the notice, the rule presumes receipt five calendar days later, but the presumption can be rebutted only with evidence. The article on Medicare appeal deadlines covers the day count at each level.
Step 2: identify the contractor that issued the notice
The request goes to the contractor named in the notice. Do not send it to a different contractor or agency on the assumption that it will be forwarded. A request sent to the wrong agency in good faith is a situation the good-cause rule lists, but that is an argument for relief, not a safe harbor.
Step 3: assemble the evidence record
Collect the records for every claim at issue. Submit the evidence with the request. A later submission can extend the contractor’s decision period by up to 14 calendar days each time (42 C.F.R. § 405.950), and the documentation that the notice later identifies as missing becomes your burden at reconsideration.
Step 4: prepare the request in writing
Use the standard CMS form where possible. Include the identification elements the rule requires, state the reason for disagreement, and list the attached evidence. If the determination rests on a statistical sample, address the methodology as well as the claims. The articles on challenging the extrapolation methodology used in large-scale healthcare audits and on identifying statistical sampling errors are the next stops.
Step 5: file so the contractor receives it, and keep proof
The request is considered filed when the contractor receives it (42 C.F.R. § 405.942(a)(2)). Mailing on the last day is not filing on the last day. Keep the proof of when the contractor received it.
Step 6: calendar the next clocks
Calendar the contractor’s 60-day decision period, the 180-day reconsideration deadline that starts when you receive the redetermination notice, and the date on which recoupment can resume if the contractor affirms. Replace the calendar when the notice arrives. A deadline from the previous level does not carry forward.
The Contractor’s 60 Days
The contractor has 60 calendar days from receipt of a timely request to decide, and each later submission of evidence can extend that period by up to 14 calendar days (42 C.F.R. § 405.950). The text of § 405.950 reviewed for this article does not say what happens if the contractor misses the period. Do not plan on a default in your favor.
The practical effect is that completeness helps your timeline. A request that arrives with the full record gives the contractor less reason to extend, and every later submission can move the date.
What Recoupment Does While the Request Is Pending
A valid, timely request stops recoupment from starting (42 C.F.R. § 405.379(d)(1)). The pause is real, but it is not permanent. If the contractor affirms the determination, recoupment can resume on day 60 after the date of the redetermination notice, or after the notice of the revised amount in a partial affirmation (§ 405.379(e)). A valid, timely request for reconsideration stops it again (§ 405.379(d)(3)). Because the pause can resume on day 60, a reconsideration request filed after that day may preserve the appeal without preserving the pause.
The recoupment rule covers post-payment denials under Part A and Part B and certain Medicare Secondary Payer recoveries. It does not cover cost report overpayments, which follow a different path.
If the redetermination reverses the determination in whole or in part, the contractor must adjust the overpayment and the interest (§ 405.379(d)(8)). Amounts already recovered may be applied to other debts you owe to CMS or HHS before they are returned to you. A reversal on appeal does not always arrive as a check.
If the 120 Days Have Already Passed
The rule allows the contractor to extend the deadline for good cause, but only through a written request that explains the delay and meets the content rule in § 405.944 (42 C.F.R. § 405.942(b)). The rule lists examples: serious illness or the death of a close family member, destruction of important records, incorrect information from the contractor, a notice that was never received, and a good-faith request sent to the wrong agency.
A late request is not a courtesy. It is a separate argument that the record has to support, and it should say what happened and no more. The article on good cause for a late Medicare appeal covers what the contractor needs to see.
Do not confuse a late appeal with a reopening. A reopening is a different tool with different clocks, discussed in the article on Medicare claim reopening.
What Comes After the Redetermination
If the contractor affirms the determination, you have 180 calendar days from receiving the redetermination notice to request a reconsideration by a Qualified Independent Contractor, with the same five-day presumption of receipt (42 C.F.R. § 405.962). A good-cause extension for a late reconsideration request has to be filed together with the request. The article on Medicare reconsideration by the QIC covers that level.
Evidence is the thread between the two levels. The article on new evidence in a Medicare appeal covers what happens to documentation that arrives after the first record closes.
Common Provider Mistakes With a Redetermination Request
Filing Without the Record
A request that states disagreement without the supporting records can be timely and still lose. The reconsideration rule treats the evidence cutoff as a deadline of its own.
Treating the 120 Days as a Cushion
The 120 days are a filing limit, not a planning period. Recoupment can begin on day 41, so the useful work happens in the first weeks.
Sending the Request to the Wrong Place
The request goes to the contractor named in the notice. A request that reaches another agency is not filed until the contractor receives it.
Counting From the Wrong Date
The count starts on receipt, not on the date on the demand letter and not on the day someone in your office first read it. Keep the proof of when the notice arrived.
Making Informal Explanations That Become Admissions
A casual comment such as “the biller must have missed that,” “we documented it after the visit,” or “we have always submitted it this way” can later be cited as evidence of knowledge or systemic failure. Calls to the contractor, emails to the reviewer, and cover letters are part of the record. Your written response is part of the evidentiary record.
Checklist for the First Weeks After the Notice
The first response window matters. Find the notice. Date it. Identify the contractor. Calendar every clock. Route every contact through one person.
- On receipt. Record the date and method of receipt. Keep the envelope, portal record, or transmittal.
- Before day 41. File the request with the complete record if you can. A valid, timely request stops recoupment from starting.
- Before the filing deadline. Confirm the request goes to the contractor named in the notice, and keep proof of when the contractor received it.
- Throughout. Preserve the claim files, the medical records, the audit trail, and every communication with the contractor. Do not overwrite or backdate any record after the notice arrives. Corrections belong in a documented addendum.
- On the decision. Replace the calendar. The next deadline, the recoupment resumption date, and the evidence cutoff are all new.
When Counsel Should Be Involved
Some requests justify legal review before filing. If the determination rests on a statistical sample, if it arrives with a payment suspension, a records request, or a subpoena, or if the record has gaps you cannot close, the first filing shapes the rest of the matter. If counsel directs the review, communications about legal exposure may be better protected under the attorney-client privilege than informal email among billing and operations staff, where the privilege applies. These matters are described on the pages for Medicare and Medicaid overpayments and defense investigations, and the practice areas page lists the rest.
These rules are federal and apply wherever the demand originates.
The practical decision rule is simple: if the receipt date cannot be proved, if the evidence is not in the file when the request is filed, or if the cash plan assumes the pause lasts through the hearing, the appeal is not protected. Build the record before the next clock starts.
Frequently Asked Questions
What is a Medicare redetermination request?
It is the first level of appeal of a Medicare Part A or Part B overpayment determination, filed with the contractor named in the notice. The contractor reviews its own initial determination.
How long do you have to file a Medicare redetermination request?
You have 120 calendar days from receiving the notice of the initial determination (42 C.F.R. § 405.942(a)). The rule presumes receipt five calendar days after the date on the notice unless you show otherwise, so the receipt date you can prove is the date that counts.
What must a redetermination request include?
At minimum, the beneficiary’s name, the Medicare number, the services and dates of service, and the name of the party or its representative. The rule prefers the standard CMS form (42 C.F.R. § 405.944). A request that supports each disagreement with the records is stronger than one that meets only the minimum.
Does filing a redetermination request stop recoupment?
A valid, timely request stops recoupment from starting (42 C.F.R. § 405.379(d)(1)). If the contractor affirms, recoupment can resume on day 60 after the redetermination notice unless a valid, timely reconsideration request is pending.
How long does the contractor have to decide?
Sixty calendar days from receipt of a timely request, and each later submission of evidence can extend that period by up to 14 calendar days (42 C.F.R. § 405.950). The text reviewed for this article does not say what happens if the contractor misses it.
What if you miss the 120-day deadline?
The contractor may extend the deadline for good cause, but the request must be in writing and must explain the delay (42 C.F.R. § 405.942(b)). It is an argument that needs evidence, not a courtesy.
About the author. Peter Suarez is the President of Vitale, Suarez & Associates, P.A. in Miami Lakes, Florida, the firm founded in 1982 as The Health Law Offices of Anthony C. Vitale, P.A. He has worked in healthcare law at the firm for 38 years, first as a Florida Registered Paralegal and Office Administrator, and was admitted to The Florida Bar in 2025 after earning his J.D. from Florida International University College of Law. He also holds a B.A. in Business Administration, magna cum laude, from Florida International University. He played an integral role in a three-week federal trial involving a physician charged with conspiracy to unlawfully dispense and distribute controlled substances. He is a member of the American Health Law Association, the American Bar Association, the Dade County Bar Association, and the Cuban American Bar Association. Learn more about the firm.
This article is for general information purposes only and should not be taken as legal advice for any individual case or situation. Reading it, or corresponding with us through this site, is not intended to create and does not create an attorney-client relationship. Federal and Florida healthcare regulations change frequently, and how any rule applies depends on the specific facts of your arrangement, your payor contracts, and your jurisdiction. Vitale, Suarez & Associates, P.A. is based in Miami Lakes, Florida and represents clients in Florida. If you have received an audit notice, records request, subpoena, civil investigative demand, or overpayment demand, speak with a licensed attorney before you respond.
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