Peer-to-Peer Review for Prior Authorization: What Providers Need to Know Before the Call

What is a peer-to-peer review?

A peer-to-peer review is a clinical discussion between the treating or requesting clinician and a clinician involved in a health plan's utilization-management process. It gives the treating clinician a chance to clarify the patient's condition, explain why the requested service is medically necessary, and address information that may have been missing or misunderstood during the original prior authorization review.

What it does not represent is a universal second chance after every prior authorization denial.

Whether a peer-to-peer discussion is available, when it must occur, who can participate, and whether the discussion can change the determination all depend on the patient's plan and the payer's process. Current payer guidance shows how much this varies. Aetna describes peer-to-peer review as a conversation in which the provider can share more information about the patient's course of treatment with an Aetna clinical reviewer, and notes that the option is not available for Texas members. WellSense states expressly that peer-to-peer discussions do not replace the formal appeal process.

For revenue cycle and authorization teams, that distinction matters. The first task after an adverse determination is not simply to "schedule a P2P." It is to determine what procedural option is actually available for that case.

What happens during a peer-to-peer review?

The point of a peer-to-peer discussion is clinical. The requesting clinician should expect to explain the patient's presentation, prior treatment, diagnostic findings and the medical rationale for the requested service. The payer reviewer may explain the clinical criteria applied to the request or identify documentation that was missing from the initial submission.

Aetna's dispute guidance says the treating physician should be prepared to discuss clinical information about the patient's condition that supports the medical necessity of the requested service. It adds that documentation for reviews or appeals may include patient history, physical examination findings, diagnostic test results, treatment plans and responses to previous treatment.

That makes a P2P fundamentally different from an ordinary payer status call. The clinician is not calling merely to ask why an authorization was denied. The useful part of the conversation is the ability to connect the payer's rationale to the patient's clinical record.

Is peer-to-peer review the same as an appeal?

No. The two processes may occur at different stages and carry different procedural rights. A peer-to-peer discussion is generally a clinician-to-clinician conversation within the payer's utilization-management process. An appeal is a formal request to review an adverse benefit or coverage determination under the applicable plan rules.

A P2P therefore should not be treated as a substitute for checking the appeal deadline. That point has become particularly important in some Medicare Advantage workflows. Wellcare announced that, effective August 17, 2026, pre- and post-decision P2P discussions no longer result in reconsideration of inpatient and post-acute care authorization determinations, across all Wellcare health plans including Medicare Advantage and D-SNP plans. Any reconsideration now runs exclusively through the formal appeals process. Priority Health's peer-to-peer policy similarly labels post-denial P2Ps for Medicare inpatient urgent or emergent admissions and long-term acute care hospital requests "informational only."

The operational rule is simple:

Never assume that scheduling a peer-to-peer preserves or replaces an appeal right.

Check both processes independently. If the denial is ultimately appealed, our guide to writing an insurance appeal letter covers the next step.

When should a provider request a peer-to-peer?

A P2P is most useful when the problem is genuinely clinical and a clinician can add context that was not apparent from the record reviewed initially.

Examples can include:

• the documentation did not make the severity of the patient's condition obvious;
• the payer applied criteria without information about failed conservative treatment;
• imaging, laboratory results or prior treatment history were omitted;
• the requested site or intensity of care requires additional clinical justification;
• the treatment plan differs from the typical pathway for a clinically important reason.

A peer-to-peer is less likely to solve a problem that is fundamentally administrative.

If the wrong member ID was submitted, the authorization went to the wrong entity, the requested CPT code was incorrect, or the request never reached the appropriate utilization-management vendor, the first step is usually to fix or route the underlying administrative problem.

Clinical discussion cannot repair bad transaction data.

The P2P window may be much shorter than the appeal window

Authorization teams should treat the P2P deadline as its own operational clock. There is no safe national deadline to memorize.

UnitedHealthcare's appeals page says the review request time frame depends on case type and any applicable state guidelines, and states that inpatient cases must be submitted within 3 business days and outpatient cases within 21 calendar days from the posted denial. The same page also notes that most reviews need to be requested within 24 hours of a coverage denial, although this varies by plan and state. WellSense publishes a different rule: requests must be made within 30 calendar days of the determination date.

Those numbers should not be generalized to other plans, and even a single payer's guidance can carry more than one timeframe. Instead, capture the deadline from the denial notice, provider portal or current payer policy as soon as the adverse determination arrives.

An authorization work queue that simply says "P2P needed" is incomplete. At minimum, it should identify:

• payer and product;
• authorization or case number;
• date of determination;
• P2P request deadline;
• appeal deadline;
• scheduling method;
• clinician who must participate;
• denial reason;
• clinical criteria or policy cited;
• records already supplied;
• additional evidence to discuss or submit.

Read the denial before scheduling the call

A common operational mistake is scheduling the physician before the team has established exactly what needs to be discussed.

Start with the adverse determination. Under CMS's Interoperability and Prior Authorization final rule (CMS-0057-F), impacted payers must provide a specific reason for denied prior authorization decisions beginning in 2026. Impacted payers include Medicare Advantage organizations, state Medicaid and CHIP fee-for-service programs, Medicaid managed care plans, CHIP managed care entities and Qualified Health Plan issuers on the Federally Facilitated Exchanges. The requirement does not apply to prior authorization decisions for drugs, and it does not cover every U.S. health plan.

Where it applies, that reason should become the starting point for preparation.

Ask:

What criterion did the payer believe was not satisfied?

Then:

What fact in the patient's record addresses that criterion?

The difference between those questions is the difference between an improvised P2P and a prepared one.

What should the clinician have before the peer-to-peer?

The precise record depends on the case, but preparation should usually include the clinical facts needed to address the denial rationale rather than the entire chart indiscriminately.

Useful material may include:

• the denial or non-affirmation notice;
• payer policy or criteria referenced in the decision;
• relevant history and examination findings;
• diagnostic or imaging results;
• prior treatments and the patient's response;
• contraindications to alternative treatments;
• operative or treatment plan;
• dates that matter to urgency;
• documentation submitted with the original authorization;
• new documentation that was not available during the first review.

CMS makes a similar point for prior authorization requests under its WISeR model, a CMS Innovation Center model that adds prior authorization for selected services in Traditional Medicare in participating states. The WISeR FAQ says comprehensive supporting clinical information, such as recent visit notes, relevant lab or imaging results, medical necessity rationale, prior treatment history and current treatment plans, should be included for the service requested, as needed. (For more on WISeR, see AI is now on both sides of prior authorization.)

The goal is not volume. It is relevance.

Separate the scheduling work from the clinical work

P2P operations often involve two very different types of labor. The administrative team may need to identify the correct payer, locate the case, obtain the denial rationale, determine whether P2P is available, find the deadline, schedule the reviewer and assemble documentation.

The clinician's role should be concentrated on the part only the clinician can do: discussing the medical rationale. That separation becomes increasingly important at scale. A physician spending ten minutes on a clinical conversation is one thing. A physician spending another half hour locating a phone number, waiting for transfers and reconstructing a missing authorization record is another. The best authorization workflows therefore treat P2P preparation as a structured handoff, not simply an appointment on a physician's calendar. The same principle applies across prior authorization follow-up more broadly, and it is why our orthopedic prior authorization guide argues for keeping peer-to-peer review human while automating the status work around it.

Document what happened after the call

A completed P2P should produce a usable operational record.

Record:

• date and time;
• payer;
• reviewer name or identifying information when available;
• treating clinician;
• authorization or case number;
• issue discussed;
• additional evidence provided;
• outcome;
• any new authorization number;
• approved codes, units, dates or level of care;
• follow-up requirement;
• appeal or resubmission deadline if the determination was unchanged.

Do not reduce the outcome to "P2P completed."

An approval that cannot later be reconciled to the claim is not an operationally complete authorization.

Likewise, if the payer leaves the decision unchanged, the revenue cycle team needs to know what procedural path remains and when it closes. For Medicare Advantage in particular, appeals are worth pursuing: see Medicare Advantage denials for what federal oversight has found about overturn rates.

Peer-to-peer review works best as a narrow clinical escalation

The practical purpose of a P2P is narrower than its name sometimes suggests.

It is not simply "calling the payer again." It is an opportunity, when the payer and plan allow it, to put a treating clinician into the utilization-management discussion and address the clinical basis of an authorization decision.

That makes the best workflow:

1. identify the exact adverse determination;
2. verify whether P2P is available and what it can accomplish;
3. protect any independent appeal deadline;
4. prepare the clinical issue before involving the clinician;
5. document the outcome in a form that downstream authorization and billing teams can use.

The details will vary by payer. The discipline should not.

FAQ

Can a peer-to-peer review overturn a prior authorization denial?

Sometimes, but not always. The answer depends on the payer, plan and stage of review. Some processes permit reconsideration after the clinical discussion, while others treat post-denial P2P as informational only and require a formal appeal to seek reversal.

Who usually participates in a peer-to-peer review?

Typically a treating or requesting clinician and a clinical reviewer associated with the payer's utilization-management process. For Medicare Advantage, federal rules require that an expected adverse medical-necessity decision be reviewed by a physician or other appropriate health care professional with expertise appropriate to the services at issue, before the plan issues the decision. The same regulation says that reviewer need not, in all cases, be of the same specialty as the treating physician (42 CFR 422.566(d)). Payers' own rules about who may request or attend a P2P vary, so verify whether the payer requires the ordering physician, another licensed clinician or a specific practitioner type.

Does requesting a P2P extend the appeal deadline?

Do not assume that it does. P2P and appeal timelines should be tracked separately unless the applicable plan documentation explicitly says otherwise.

Sources

All retrieved October 5, 2026.

• Aetna, "Prior authorization guidelines": https://www.aetna.com/individuals-families/prior-authorization-guidelines.html
• Aetna, "Dispute process" (September 22, 2025): https://www.aetna.com/insights/dispute-process.html
• WellSense Health Plan, "Prior Authorization" (updated September 14, 2026): https://www.wellsense.org/providers/prior-authorization
• UnitedHealthcare, "Appeals": https://www.uhcprovider.com/en/claims-payments-billing/appeals.html
• Wellcare, "Peer-to-Peer Decision Discussion Updates" (updated October 1, 2026): https://www.wellcare.com/en/providers/medicare-bulletins/peer-to-peer-decision-discussion-updates
• Priority Health, "Peer-to-peer reviews policy for medical authorizations" (updated February 2026): https://priorityhealth.stylelabs.cloud/api/public/content/f5c1392f893840d1a412199a04ef9e62?v=d5e0fb8c
• CMS, "CMS Interoperability and Prior Authorization Final Rule (CMS-0057-F)" fact sheet (January 17, 2024): https://www.cms.gov/newsroom/fact-sheets/cms-interoperability-and-prior-authorization-final-rule-cms-0057-f
• CMS Innovation Center, "WISeR Model Frequently Asked Questions" (modified September 22, 2026): https://www.cms.gov/priorities/innovation/files/document/wiser-model-frequently-asked-questions
• 42 CFR 422.566, Organization determinations: https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-422/subpart-M/section-422.566