What Is a Peer-to-Peer Review? How Your Doctor Can Fight Your Denial

A peer-to-peer review is one of the most powerful tools available for overturning an insurance denial — and many patients do not even know it exists. It allows your treating doctor to speak directly with the insurer's medical reviewer to make the case for why your treatment should be covered. Here is how it works and how to make it count.

The Simple Definition

A peer-to-peer review (also called a physician-to-physician review or P2P) is a phone conversation between your treating doctor and the insurance company's medical director or reviewing physician. The purpose is to discuss your specific case — why your doctor ordered the treatment, why it is medically necessary, and why the insurer's denial criteria do not apply to your situation.

The word "peer" means the conversation happens between physicians (or other qualified clinicians), not between you and the insurer. Your doctor advocates on your behalf in a clinical discussion that goes beyond what written records can convey.

When Can You Request a Peer-to-Peer Review?

A peer-to-peer review can be requested in several situations:

• After a Prior Authorization Denied: How to Appeal" class="auto-link">prior authorization denial: Before the service is provided, when the insurer refuses to pre-approve treatment
• After a claim denial based on medical necessity: When the insurer says the treatment you already received was not medically necessary
• During concurrent review: When the insurer wants to stop covering ongoing treatment (like ending coverage for a hospital stay)
• As part of the internal appeal process: Many insurers offer P2P as part of the first-level appeal

Many states require insurers to offer a peer-to-peer review opportunity before finalizing a medical necessity denial. Even in states that do not mandate it, most insurers will accommodate P2P requests because they are an efficient way to resolve disputes.

Why Peer-to-Peer Reviews Work

Peer-to-peer reviews have a significantly higher success rate than written appeals alone. Here is why:

Clinical nuance gets lost in paperwork. Written medical records and utilization review criteria are necessarily simplified. Your doctor can explain the full clinical picture — why your case is different from the typical patient, why alternatives will not work for you specifically, and what the consequences of non-treatment would be.

Real-time dialogue allows for clarification. The insurer's reviewer can ask questions and your doctor can respond immediately. Misunderstandings that might persist through rounds of written appeals can be resolved in minutes.

It puts a human face on the denial. A physician speaking to another physician about a real patient creates a different dynamic than a faceless review of paperwork. The reviewing physician is more likely to carefully consider the clinical reasoning when hearing it directly from the treating physician.

The reviewer may not have had complete information. Many denials happen because the reviewer did not receive all relevant medical records or did not understand a critical clinical detail. The P2P conversation can fill these gaps.

How the Process Works

Here is what happens step by step:

1. Your doctor's office calls the insurer and requests a peer-to-peer review. The request should be made promptly after the denial — some insurers impose time limits (typically 5 to 10 business days).

   Fighting a denied claim?
   ClaimBack generates a professional appeal letter in 3 minutes — citing real insurance regulations for your country. Get your free analysis →

2. The insurer schedules the call. This may happen immediately, within 24 hours for urgent cases, or within a few business days for routine cases. Some insurers require the call to be scheduled in advance, while others connect the physicians directly.

How This Affects Your Appeal

To maximize the chances of a successful peer-to-peer review:

1. Ask your doctor to request the P2P promptly. Time limits apply. The sooner your doctor calls, the better.

2. Get the denial criteria first. Before the P2P call, request the specific clinical criteria the insurer used to deny the claim. Your doctor needs to know exactly what standard they are arguing against.

3. Help your doctor prepare. Encourage your doctor (or their staff) to have the following ready for the call:

   • Your complete medical record and treatment history
   • The specific denial criteria they need to address
   • Current clinical practice guidelines from relevant medical societies (e.g., NCCN for cancer, APA for psychiatry)
   • Published medical literature supporting the treatment
   • A clear explanation of why alternatives are not appropriate for your specific case
   • Documentation of any prior treatments tried and why they failed

4. Ask your doctor to take notes. Your doctor should document what was discussed, what the reviewer said, and the outcome. These notes become part of the record and are valuable if further appeals are needed.

5. Request the reviewer's qualifications. Many states require the reviewing physician to be licensed in the same specialty as your treating physician. If a general internist is reviewing a denial of a complex neurosurgical procedure, this is a problem you can raise.

6. Follow up in writing. After the P2P call, your doctor should send a written summary to the insurer confirming what was discussed and any commitments the reviewer made. This creates a paper trail.

What If the Peer-to-Peer Review Does Not Work?

If the P2P does not overturn the denial, you still have options:

• File a formal internal appeal with additional supporting evidence. The P2P conversation may reveal exactly what additional documentation or arguments are needed.
• Request external review through an IROs) Explained" class="auto-link">Independent Review Organization. An external reviewer evaluates the case independently.
• File a complaint with your state insurance department if you believe the review was not conducted fairly or the reviewer was not qualified.

Regulations That Protect You

• State utilization review laws: Many states require insurers to offer peer-to-peer review before finalizing medical necessity denials. Check your state's requirements through your state insurance department.
• ERISA, 29 CFR 2560.503-1: Requires a full and fair review of denied claims, which includes the opportunity to present evidence and arguments
• ACA, 45 CFR 147.136: Establishes internal and external appeal rights that complement the P2P process
• AMA advocacy: The AMA has advocated strongly for peer-to-peer review rights as an essential safeguard in the utilization review and prior authorization process

Try ClaimBack

If your claim has been denied for medical necessity and you want to prepare for a peer-to-peer review or a written appeal, start your free claim analysis with ClaimBack. We help you understand the denial criteria and generate a professional appeal letter that your doctor can use as a reference for the P2P conversation.

Related Reading

• How to Request a Peer-to-Peer Review and Win
• Insurance Peer-to-Peer Review: What It Is and How to Use It
• How to Request a Peer-to-Peer Review for Insurance Denials
• Cost of Independent Medical Review: What Patients Actually Pay
• What Is Independent Medical Review (IMR)? A Deep Dive