Peer-to-peer review: how to turn a prior authorization denial around
A denial is not a verdict. A large share of denials are overturned when someone challenges them, and the peer-to-peer review is the fastest way to make that challenge. This guide covers what a peer-to-peer review is, why it works, how to prepare so the call is short and successful, and what to do when it does not go your way.
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Last reviewed: June 2026.
A denial is not a verdict. It feels like one, because it arrives as a flat no after your team did the work, and the easy response is to write the case off and move on. That instinct is expensive. A large share of denials are overturned when someone challenges them, and the peer-to-peer review is the fastest way to make that challenge. It is a phone call between your physician and the payer's reviewer, and most practices either skip it or walk into it unprepared. Both are unforced errors.
This guide covers what a peer-to-peer review is, why it works, how to prepare so the call is short and successful, and what to do when it does not go your way.
The short version
- A peer-to-peer review is a physician-to-physician call that often overturns a denial faster than a formal appeal, and most challenged denials are eventually overturned.
- Preparation decides the outcome: have the denial reason, the cited criterion, your supporting documentation, and the specific approval you are requesting in front of you.
- Sort denials first, then route clinical denials to a peer-to-peer and administrative denials to a clean resubmission.
What is a peer-to-peer review?
A peer-to-peer review, often called a P2P, is a conversation between the physician who ordered a service and a clinical reviewer at the payer, usually a physician, about a denied or pending prior authorization. The purpose is to let the ordering physician explain the clinical rationale directly, in a way a form cannot capture, and give the payer's reviewer the context to approve the request.
It sits between the initial denial and a formal written appeal. It is faster than an appeal and often resolves the case in a single call, which is why it belongs early in your denial response, not as a last resort.
Why do payers offer peer-to-peer, and why do practices skip it?
Payers offer P2P because it is efficient for them too. A short call with the ordering physician resolves cases that would otherwise become appeals, complaints, and regulatory friction. For the practice, the call is a chance to put clinical judgment in front of a human reviewer who can say yes.
Practices skip it for predictable reasons. The call has to happen in a narrow window, often within a few days of the denial. It pulls a physician out of clinic for a scheduled call. And without preparation it feels like a coin flip, so it gets deprioritized. Each of those is a workflow problem, not a reason the tool does not work.
What does the denial math say about challenging?
The case for picking up the phone is in the numbers.
| Metric | Figure | Source |
|---|---|---|
| Denied claims eventually paid after appeal | Up to 70% | Premier |
| Medicare Advantage denials overturned on appeal | About 57% | Health Affairs |
| Denied claims that are never resubmitted or appealed | About 65% | Industry / AHA |
| Physicians reporting prior authorization delays harm care | 94% | AMA |
| Cost to rework a single denied claim | $25 to $118 | HFMA |
Read the first and third rows together. Most challenged denials are overturned, and most denials are never challenged. The peer-to-peer is how you move a case from the second group into the first.
How do you prepare for a peer-to-peer call?
Preparation is the whole game. Before the call, assemble four things.
The payer's stated denial reason and the exact coverage criterion it cited, so you are arguing the specific point, not the case in general. The clinical evidence that meets that criterion: the documented conservative care with dates, the imaging or labs, the guideline support. A two-sentence clinical summary the physician can lead with, so the call opens with the strongest point. And the specific approval you are asking for, named by code and duration, so the reviewer can act without a second call.
The physician should have all of this in front of them when the call starts. A P2P fails most often not because the care was wrong but because the physician was handed the call cold and had to reconstruct the case live. The supporting documentation should already meet the standard we describe in our guide to the medical necessity letter.
Stop letting P2P windows lapse
If your team is letting peer-to-peer windows lapse because nobody owns the prep, that is recoverable revenue walking out the door. Book a demo to see how the prep and scheduling get handled before the window closes.
What should you say, and not say, on the call?
Lead with the clinical rationale tied to the payer's own criterion. Reference the specific guideline or policy language that supports the request. Be concise, because the reviewer is working a queue and a focused case is a persuasive one. Ask directly for the approval you want.
Avoid arguing the policy itself, which the reviewer cannot change on the call. Avoid vague appeals to clinical judgment without the documentation to back them. And avoid treating the reviewer as an adversary, because the goal is to give a fellow physician the basis to say yes, not to win a debate.
What happens if the peer-to-peer upholds the denial?
A P2P that goes against you is not the end. It is the setup for a stronger formal appeal, because you now know exactly which criterion the payer is standing on and can build the written appeal around it. Document what was said, escalate to a formal appeal with the specific evidence the reviewer found lacking, and use the appeal-letter structure we cover in our guide to appeal letter templates. The data says persistence pays, since most denials that are appealed are eventually overturned. Knowing why prior authorizations get denied in the first place helps you preempt the next one.
Where peer-to-peer matters most, and where it does not
P2P returns the most for practices with high volumes of clinically complex, frequently denied services: imaging, procedures, devices, infusions, and higher levels of behavioral health care. When the denial is about clinical nuance the form could not capture, a physician-to-physician call is the right tool.
It matters less for denials that are administrative rather than clinical, a missing code, an eligibility error, a wrong plan, where the fix is a corrected resubmission, not a clinical conversation. Spending physician time on a P2P for an administrative denial is effort misapplied. Sort denials by type first, then route the clinical ones to P2P. If the underlying problem is speed rather than denials, start with our guide to speeding up prior authorization for specialists.
How Linear Health supports the peer-to-peer workflow
Linear Health flags denials by reason as they come in, so clinical denials that warrant a P2P are separated from administrative ones that need a resubmission. For the clinical ones, it assembles the denial reason, the cited criterion, and the supporting documentation into one place before the call, and tracks the P2P window so it does not lapse. The physician walks into the call prepared instead of cold. Customers see up to 80 percent less manual time across the authorization and denial workflow, which includes not losing cases to missed P2P windows. The timing pressure is real, as our guide to how long prior authorization takes makes clear.
“I used to dread peer-to-peer calls because I was reconstructing the case while the reviewer waited. Now the denial reason, the criterion, and my documentation are in front of me before I dial. The call takes four minutes and I win most of them, because I am answering the exact point they raised.”
Frequently asked questions
How long do I have to request a peer-to-peer review?
The window varies by payer but is often only a few business days after the denial. Because it is short, the practical risk is letting it lapse. Track the deadline the moment a denial arrives.
Who conducts the peer-to-peer call on the practice side?
The ordering physician, or another physician familiar with the case. Payers generally require a physician-to-physician conversation, so a coordinator cannot conduct the clinical portion of the call.
Is a peer-to-peer the same as an appeal?
No. A peer-to-peer is an informal physician-to-physician call that often resolves the denial quickly. An appeal is a formal, usually written, request for reconsideration. P2P comes first and is faster; the appeal is the next step if the P2P does not succeed.
What is the success rate of peer-to-peer reviews?
There is no single published rate, but the broader pattern is clear: most denials that are challenged through P2P or appeal are eventually overturned, while most denials are never challenged at all. Preparation raises your odds on any individual call.
Can automation help with peer-to-peer reviews?
Yes, on the preparation and tracking, not the clinical conversation. Automation can sort clinical from administrative denials, assemble the case file for the call, and prevent the P2P window from lapsing. The physician still conducts the call.
Medically reviewed by Dr. Charles Sweet, MD, MPH.
Sami scaled Simple Online Healthcare to $150M and built a multi-specialty telehealth clinic across 20 specialties and all 50 states. Connect on LinkedIn.
