Peer to Peer Insurance Review: A Behavioral Health Playbook

A peer to peer insurance review is a phone call between your treating clinician and the payer's medical director to argue medical necessity after a denial or adverse concurrent-review determination. This playbook gives you a pre-call checklist, level-of-care talking points grounded in ASAM 4th Edition criteria, and the documentation steps that turn a favorable call into an approved authorization.

What does a peer-to-peer review in insurance involve?

A peer-to-peer review is a phone conversation between the treating clinician and a medical director or contracted reviewer at the payor, held after an adverse determination, denial, or concurrent-review cutoff. The goal is to argue medical necessity case-by-case and overturn the decision before a formal appeal is filed.

Who speaks on each side of the call

On your side, it should be the clinician most involved in the patient's care: the UR nurse, treating psychiatrist, or program medical director. On the payor's side, it is a physician or licensed reviewer, often one who never read the full chart before issuing the determination. Ask for the reviewer's name, credentials, and the criteria set they applied at the start of every call.

Where P2P fits in the denial timeline

Many plans, including Medicare Advantage and Medicaid managed care plans, offer a peer-to-peer discussion with the plan's medical director or reviewer, but the window to request it is set by each plan's policy, and some plans close it once an appeal has been filed (Wellcare provider bulletin). Commercial payors follow similar patterns, but authorization windows and P2P deadlines differ by plan, which is why tracking them per payor matters. Miss the window and your only path is a written appeal. For how this plays out specifically in SUD and mental-health levels of care, see peer-to-peer review in behavioral health.

When does a payer require a peer-to-peer review for insurance?

Payers typically require a peer-to-peer review in four situations: after an initial concurrent review denial, after a continued-stay denial, when they propose a level-of-care downgrade (residential to PHP, PHP to IOP), and when you request out-of-network coverage or a single-case agreement. The trigger is usually a denial letter or an adverse determination notice, and it names the deadline for requesting the call.

P2P after a concurrent review denial

A concurrent review denial mid-stay is the most common trigger. The payor reviewer has decided current documentation no longer supports the ASAM level of care, and the P2P is your window to argue medical necessity before the denial finalizes. Watch the authorization window in the denial letter; missing it can forfeit your call. Grounding your argument in ASAM 4th Edition dimensions is covered in our guide to ASAM criteria and insurance authorization.

P2P before formal appeal vs as a condition of appeal

Some payors offer the P2P as an optional step before you file a formal appeal; others make it a required condition, meaning your appeal is rejected if you skip the call. Read the determination notice carefully, because the distinction changes your timeline and who on your team needs to be available.

How does peer-to-peer review differ from concurrent review and appeals?

UR staff run all three processes, and mixing them up costs days you cannot spare. Concurrent review is the ongoing authorization work during treatment: you submit clinical updates to justify continued stay at each level of care. A peer-to-peer review is a single clinician-to-clinician call after an adverse determination, where your provider argues medical necessity directly with the payor's reviewer. An appeal is the formal written process that follows if the call does not overturn the denial, and it runs on a deadline set by the payor or your state, often as short as 30 or 60 days.

Treat the P2P call as evidence gathering for a possible appeal: document the reviewer's name, criteria cited, and stated rationale. Tracking those outcomes across payors is where manual tracking breaks down, and it is the gap CriteriaIQ addresses in behavioral health utilization review software.

How do you prepare for a peer-to-peer review call?

Pre-call checklist

Pull the denial letter first and read the criteria the reviewer cited, not just the CARC code. Then assemble the chart in the order the reviewer will ask for it: the most recent ASAM-based assessment, nursing notes from the last 72 hours, the treatment plan, and medication administration records. Confirm the reviewer's name, credential, and the exact call window, because missing the window can convert a reversible denial into a final one. Brief the treating clinician on what the denial letter says before the call starts.

Choosing who speaks on the call

The treating clinician should speak, not the UR coordinator, whenever possible. Reviewers respond to the person who can speak to the patient's clinical course from direct knowledge, not secondhand summaries. If the clinician is unavailable, pick the clinician with the most chart contact, and have the UR nurse stay on the line to capture the reviewer's name, callback number, and stated rationale verbatim.

Matching your documentation to the criteria the reviewer will use

Preparation for a peer-to-peer review is chart assembly against the reviewer's criteria, not a general rehearsing of the case. Open the criteria the payor cited, whether ASAM 4th Edition dimensions or a plan-specific medical necessity policy, and map one chart item to each dimension the reviewer will probe. For a residential level-of-care denial, that usually means an explicit statement on the risk of continued use without 24-hour structure, the failed step-down or lower level of care, and the length of stay justification tied to measurable treatment goals. If a dimension lacks a supporting note, write an addendum before the call rather than hoping the reviewer reads past the gap. A single missing assessment or delayed note is enough to trigger an automatic denial, so the checklist exists to close those gaps while the denial is still reversible, and tools like CriteriaIQ RCM flag which criteria are unmet on the Kipu EMR charts you already run even though the mapping itself remains your work regardless of the system. For more on the documentation side of UR, see Steven Cavan's author page.

What should you say during an insurance peer-to-peer review?

Opening the call

Lead with the reference number, the member ID, and the level of care under request. State your name, credential, and role, then confirm the reviewer's name and that they are licensed in a comparable specialty. Ask upfront whether they have the chart in front of them and which denial reason code they are upholding. That last question shapes the whole call.

Arguing medical necessity dimension by dimension

Structure your argument on the six ASAM dimensions, because that is the framework most payor medical-necessity policies reference. Walk each dimension with a concrete chart artifact: the ASAM dimension assessment in your intake note, the most recent nursing assessment, urinalysis results, and the treatment plan showing active goals. For residential, tie your length-of-stay request to dimensional risk, not to the patient's preference or bed availability. The ASAM Criteria dimensional framework is the standard to cite by name when the reviewer pushes back on level of care. If concurrent review is your bottleneck, the same dimension-by-dimension evidence carries over, as covered in Concurrent Review in Behavioral Health.

Questions to ask the payor reviewer

Close with direct questions: what specific documentation would change the determination, which dimension the reviewer finds insufficient, and whether a partial authorization is on the table. Get the reviewer's determination window and fax number for supplemental records before hanging up.

How do you document and follow up after a peer-to-peer review?

What to record from every call

Log five data points before you hang up: the reviewer's full name and NPI, call date and time, the payer reference number for the review, the reviewer's stated determination, and any clinical criteria they cited. Enter this directly into the case note in Kipu, not a side spreadsheet, so the authorization timeline stays attached to the chart. If the reviewer asked for an additional document, log that as a task with a due date tied to the authorization window.

Getting the outcome in writing

A verbal approval is not an approval until it arrives in writing. Ask the reviewer on the call to issue the written determination, then confirm it appears in the payer portal or by fax within your payer's stated turnaround. If an overturned denial is not confirmed in writing by the next business day, calendar the appeal deadline immediately and treat the verbal outcome as unconfirmed.

Feeding P2P outcomes into your appeal or reauthorization

Reference the reference number and reviewer NPI in any appeal letter or reauthorization service request form, so the payer connects the new request to the prior call. If the P2P upheld the denial, pull the specific CARC/RARC language into your appeal and address the reviewer's stated medical necessity objection directly. Track each outcome against your denial rate and A/R aging so repeated payer-specific objections surface in your concurrent review prep.

What are common reasons peer-to-peer reviews fail to overturn denials?

Most failed P2P calls trace back to five things: the wrong person on the line, a documentation gap, an argument about tone instead of criteria, no reference number captured, and no written follow-up. Behavioral health UR staff already juggle dozens of concurrent cases across payors with different medical necessity standards, so these failures compound quickly.

Documentation gaps that sink the call

A missing nursing note or a late assessment hands the payer's reviewer an easy denial: if the chart does not show medical necessity on the date of the call, ASAM 4th Edition criteria cannot be argued from memory. Confirm the service request form, current ASAM level-of-care justification, and length-of-stay data are in the chart before dialing.

Process failures on the provider side

Arguing that the denial "feels wrong" instead of walking criterion by criterion rarely works. Always capture the call reference number and reviewer name, then send a written summary the same day. If no one owns follow-up, an approved extension can quietly expire inside the authorization window.

How do you run P2P calls at scale across multiple payors?

Standardizing your P2P workflow

When one UR nurse manages dozens of concurrent cases, ad-hoc preparation is what breaks. Build one checklist and one documentation template you use for every peer-to-peer insurance review, regardless of payor: level of care, ASAM dimensions, length of stay, and the specific medical necessity language the payor's policy uses. Track each payor's authorization window and P2P deadline in one place, not in a shared inbox where a request can sit unread until the window closes.

Where tracking tools help and where they stop

Spreadsheets work until two payors change criteria the same week. UR tooling like Ritten or Behave Health handles parts of this workflow, and Kipu Health and Sunwave Health touch adjacent RCM functions. CriteriaIQ maps your documentation to payor criteria and tracks authorization timelines inside Kipu or BestNotes, but it does not place the call or argue your case. Your clinical judgment still wins or loses the P2P.

FAQ

What is a peer-to-peer review in insurance?

It is a scheduled phone call between your treating clinician and a medical director at the payor, held after an adverse determination. The clinician argues medical necessity case-by-case. If the call succeeds, the denial is overturned before you ever file a formal written appeal. Both commercial plans and Medicare Advantage use this process.

How do I prepare for a peer-to-peer review call?

Read the denial letter first and identify the exact criteria the reviewer cited. Assemble the chart to match: the latest ASAM assessment, recent nursing notes, the treatment plan, and medication records. Confirm the reviewer's name, credential, and call window, then brief the treating clinician on the denial's stated rationale before dialing.

Can a peer-to-peer review be denied?

The call itself is not denied, but the reviewer can uphold the original determination, meaning the denial stands. Calls most often fail when the wrong person speaks, the chart has a documentation gap, the argument ignores the cited criteria, or no one captures the reference number and written outcome afterward.

Who can do a peer-to-peer review for insurance?

The clinician most involved in the patient's care should make the call: the treating psychiatrist, program medical director, or UR nurse with direct chart knowledge. A UR coordinator can schedule it, but payor reviewers respond best to someone who can discuss the clinical course firsthand. Have a second staff member stay on the line to log details.

What happens if the peer-to-peer review doesn't overturn the denial?

You proceed to a formal written appeal, which runs on a payor or state deadline, sometimes as short as 30 or 60 days. Reference the call's reference number and reviewer NPI in the appeal letter, quote the reviewer's stated objection, and address it directly with supporting documentation before the deadline expires.