A peer to peer review insurance process is one of the most effective but underutilized tools available for overturning insurance denials. When your health insurance company denies a claim or a prior authorization based on medical necessity, your treating physician can request a direct conversation with the insurer’s medical director or reviewing physician. This doctor-to-doctor dialogue can resolve disputes that written appeals alone sometimes cannot.
Despite its effectiveness, many patients and even some physicians are unaware that peer to peer review insurance processes exist or how to initiate them. Understanding how peer-to-peer reviews work, when to request one, and how to prepare gives you a significant advantage in challenging a denial. The information here is general and educational — it is not legal or medical advice, and the exact rules depend on your specific plan, your state, and whether your coverage is a fully insured plan, a self-funded employer plan governed by ERISA, or a government program such as Medicare or Medicaid.
What Is a Peer-to-Peer Review?
A peer-to-peer review — often abbreviated P2P — is a phone conversation between your treating physician and the insurance company’s physician reviewer. The purpose is to discuss the clinical merits of a denied service, treatment, medication, or procedure. Your doctor explains why the service is medically necessary for your specific condition, and the insurer’s reviewer can ask questions, request clarification, or reconsider the denial based on the additional clinical context provided during the call.
It helps to be precise about what a P2P is and is not, because it is easy to confuse with the formal appeal. A peer-to-peer is an informal, physician-to-physician clinical discussion, frequently offered at the prior-authorization stage or right after a denial. A formal appeal is a written, procedurally defined request for the plan to reconsider its decision, with legally mandated timelines and, ultimately, the right to an independent external review. The P2P is the conversation; the appeal is the paperwork. Understanding that difference is the single biggest thing that separates this article from our companion guides on appeals.
Peer-to-peer reviews are typically available for denials based on medical necessity, which are among the most common types of insurance denials. They are not usually the right tool for administrative denials — such as a missing prior authorization, an eligibility problem, or a coding error — which are better resolved through correction and resubmission. The review can occur at the prior authorization stage before treatment, or after a claim has been denied following the service.
In many states, insurers are required to offer peer-to-peer reviews upon request, at least for certain kinds of decisions. Even where not mandated by law, most major insurers maintain a process for scheduling them. Federal rules that require medical-necessity decisions to be made by qualified health professionals create a natural framework for this type of physician-level dialogue.
Who Initiates a Peer-to-Peer Review?
This is the most important practical point, and it is where patients most often get stuck: a peer-to-peer review is almost always initiated by the provider, not by you. The call must take place between physicians (or, in some cases, between the treating clinician and a same-specialty reviewer), so it is your doctor’s office that contacts the insurer and schedules the discussion. You cannot usually pick up the phone and conduct a P2P yourself.
What you can do is drive the process. As soon as you receive a medical-necessity denial, call your treating physician’s office, tell them you want to pursue a peer-to-peer review, and provide a copy of the denial letter — including any reference or authorization number and the deadline printed on it. Ask specifically who in the practice handles P2P requests, and follow up to confirm the call was scheduled. Your persistence often determines whether the review actually happens, because busy practices do not always prioritize these calls without a nudge from the patient.
When to Request a Peer-to-Peer Review
The ideal time to request a peer-to-peer review is as soon as possible after a medical-necessity denial. Many insurers set short windows for scheduling the call — sometimes only a handful of business days after the initial denial. If the denial involves a pre-service authorization for upcoming treatment, urgency is especially important to avoid treatment delays.
Peer-to-peer reviews are most effective when the denial appears to be based on incomplete information, a misunderstanding of the clinical situation, or an overly rigid application of clinical criteria. If your doctor believes the insurer’s reviewer did not have access to all relevant records or misinterpreted the medical evidence, a direct conversation can clear up the confusion more efficiently than a written appeal alone.
They are also valuable for complex cases where the clinical nuances are difficult to convey through medical records alone. Conditions with subjective symptoms, evolving treatment protocols, or comorbidities that complicate the clinical picture often benefit from the opportunity for real-time discussion between physicians.
How to Prepare for a Peer-to-Peer Review
Preparation is the key to a successful peer-to-peer review. Your physician should approach the call as a clinical consultation, not a casual conversation. Before the call, your doctor should review the denial letter and the specific clinical criteria the insurer applied; compile all relevant medical records, including recent test results and imaging; prepare a concise summary of your diagnosis, treatment history, and the rationale for the denied service; and identify specific clinical guidelines or published research that support the treatment recommendation.
Your doctor should be ready to explain why the denied treatment is the appropriate next step given your specific clinical history. If conservative treatments have been tried and failed, this history should be documented and ready to discuss. If the insurer’s clinical criteria differ from widely accepted standards of care, your doctor should be prepared to address the discrepancy.
Some physicians bring a written outline to the call to ensure they cover all key points. This is particularly helpful for complex cases where multiple clinical factors support the treatment recommendation. The goal is to provide the insurer’s reviewer with enough specific clinical information to justify reversing the denial.
What Happens During the Call
The peer-to-peer review typically lasts around 15 to 30 minutes. Your treating physician presents the clinical case for the denied service, and the insurer’s physician reviewer asks questions and discusses the applicable criteria. The conversation is clinical in nature and focuses on whether the treatment meets the insurer’s medical-necessity standards for your specific situation.
The insurer’s reviewer may overturn the denial during or shortly after the call if the clinical information is persuasive. In some cases, the reviewer may request additional documentation before making a final decision. If the denial is upheld after the peer-to-peer review, you still have the right to pursue a formal written appeal.
It is important to note that you, as the patient, are generally not part of the peer-to-peer call. This is a conversation between physicians. However, you can and should stay in close communication with your doctor’s office about the scheduling, preparation, and outcome of the review.
Tips for Maximizing Success
Choose the right physician for the call. The doctor who is most familiar with your condition and the denied treatment should make the call. If you are seeing multiple specialists, the one whose expertise is most directly relevant to the denial should participate. A specialist generally carries more weight than a primary care physician when discussing a specialty-specific treatment. Where state law allows, you can also ask that the insurer’s reviewer be a physician in the same or a similar specialty.
Timing matters. Request the peer-to-peer review promptly after the denial. The sooner the conversation happens, the fresher the clinical details are and the sooner a potential reversal can occur. Delays can also push you closer to appeal deadlines, reducing your options if the peer-to-peer review is unsuccessful.
Document the call. Your physician should note the date, time, duration, the name and specialty of the insurer’s reviewer, the topics discussed, and the outcome. If the denial is upheld, this documentation becomes part of your appeal record and demonstrates that you pursued every available avenue. For more on building a strong appeal, see our guide on how to successfully appeal an insurance denial.
Peer-to-Peer Reviews and the Formal Appeal Process
A peer-to-peer review does not replace the formal written appeal. If the peer-to-peer review results in an overturn, the denial is resolved and the claim is processed. If the denial is upheld, you still have the full appeal process available to you, including written internal appeals and, if those fail, an independent external review.
In fact, having a documented peer-to-peer review that did not result in an overturn can strengthen your written appeal. Your appeal letter can reference the peer-to-peer conversation and explain why the insurer’s position remains incorrect despite the additional clinical context provided during the call. This shows the reviewer that you have been thorough and persistent in presenting your case.
One caution about timing: in many plans a peer-to-peer review does not count as a formal level of appeal, and your window to file a written appeal — often around 180 days from the denial under federal rules for many plans — typically continues to run during and after the peer-to-peer process. Do not let the peer-to-peer review consume so much time that you miss your written appeal deadline. Confirm the exact deadline on your denial notice and in your plan documents, because it varies by plan and situation. For templates and formatting guidance, see our appeal letter and appeal letter sample guides.
State Requirements for Peer-to-Peer Reviews
Several states have enacted laws requiring insurers to offer or conduct peer-to-peer reviews under certain circumstances. These laws vary in their specifics, including which types of denials qualify, the timeline for scheduling the review, and the qualifications required of the insurer’s reviewing physician.
Some states require that the insurer’s reviewer be a physician with the same or a similar specialty as the treating physician requesting the review. Others require that the review occur within a specific number of business days of the request. Keep in mind that self-funded employer plans are governed primarily by federal ERISA rules rather than state insurance law, so state P2P mandates may not apply to them. Contact your state insurance department — you can find it through the NAIC directory — to learn about peer-to-peer review requirements in your state, and check your plan documents to see which rules govern your coverage.
Frequently Asked Questions
Can I as the patient request a peer-to-peer review?
You can ask your physician to request one, but the actual call must be between physicians. Your role is to facilitate the process: inform your doctor about the denial, provide a copy of the denial letter, and encourage your doctor’s office to schedule the review promptly. Stay in contact with the office to learn the outcome.
What if the insurer refuses to schedule a peer-to-peer review?
If the insurer refuses, document the refusal in writing and include it in your formal written appeal. In states that require peer-to-peer reviews, a refusal may constitute a regulatory violation that you can report to your state insurance department. Even without a state mandate, an insurer’s refusal to engage in clinical dialogue can be cited as evidence that the denial was not based on a thorough review.
Does a peer-to-peer review delay my treatment?
It can, which is why scheduling the review quickly is important. For urgent situations, ask your physician to request an expedited peer-to-peer review and to emphasize the clinical urgency. Federal rules require expedited decisions for urgent pre-service care to be made quickly — often within about 72 hours — but the exact timeframe depends on your plan. If the treatment is truly urgent and delay would cause harm, your doctor should communicate this clearly to the insurer.
What if my doctor is too busy for a peer-to-peer review?
This is a common challenge. Physician time is limited, and scheduling a call with the insurer can be difficult. Explain to your doctor’s office how important the review is to your care and coverage. Some offices designate specific staff or set aside scheduled times for peer-to-peer calls. If your primary treating doctor cannot participate, ask whether another physician in the practice with relevant expertise can handle the call.
How is a peer-to-peer review different from an appeal?
A peer-to-peer review is an informal, doctor-to-doctor phone discussion of medical necessity, usually offered before or alongside the formal process. An appeal is the formal, written request — with defined deadlines and the eventual right to an independent external review — that the plan must process under federal and state rules. The P2P can resolve a denial quickly, but it does not replace your appeal rights, and it usually does not stop your appeal clock from running.
Making the Most of This Opportunity
A peer to peer review insurance process offers a direct, efficient path to resolving medical-necessity denials. It allows your physician to present your clinical case in a way that written records sometimes cannot fully capture. Work closely with your doctor to ensure the call is well-prepared and well-timed, and follow up with a formal written appeal if the denial is upheld. Our healthcare policy guide covers the broader regulatory landscape, and our articles on denied insurance claims and insurance disputes offer strategies for the full range of coverage challenges. The peer-to-peer review is one tool in a larger toolkit; use it wisely alongside the other options available to you.
The Bottom Line
A peer-to-peer (P2P) review is a doctor-to-doctor phone discussion where your treating physician argues the medical necessity of a denied service directly with the insurer’s physician reviewer. It is usually initiated by the provider, so ask your doctor’s office to request one promptly after a medical-necessity denial and hand over the denial letter. P2P reviews often happen before or alongside the formal appeal and generally do not pause your appeal deadlines, so track those dates. Preparation — the right physician, the right records, the right guidelines — makes a reversal much more likely, and even an unsuccessful P2P can strengthen a later written appeal. This is general information, not legal or medical advice; check your plan documents and state rules.
Sources
- HealthCare.gov — appealing a health plan decision, internal appeals and external review (healthcare.gov)
- Centers for Medicare & Medicaid Services (CMS) — coverage determinations and appeals (cms.gov)
- U.S. Department of Labor — ERISA claims procedures for group health plans (dol.gov)
- National Association of Insurance Commissioners (NAIC) — state insurance department directory (naic.org)