Navigating Prior Authorization for Outpatient Surgery

It's your insurance company's approval before a procedure

Prior authorization (also called pre-authorization or pre-cert) is a requirement from your insurance company that a procedure be reviewed and approved before they'll agree to cover it. Without it, they may deny the claim entirely — even if the procedure is medically necessary and covered under your plan.

Insurers use it to control costs and confirm medical necessity

The stated purpose is to ensure that procedures are medically appropriate and that less invasive options have been considered. The practical effect is that it creates a step that delays care and generates denials — some legitimate, many not. It's worth understanding the process so you're not caught off guard.

Not every procedure requires it — but many do

Routine colonoscopies often don't require authorization. Most orthopaedic surgeries do. Spine procedures, joint replacements, and anything involving an implant almost always require it. Your surgeon's office should know what requires authorization for your specific insurance plan.

Your surgeon's office typically submits the request

The authorization request is submitted by the ordering physician's office, not by you. They provide the diagnosis codes, procedure codes, clinical notes, and any supporting documentation. Your job is to confirm it's been submitted and is in progress.

Turnaround is typically 3–10 business days for non-urgent requests

Standard authorization requests take anywhere from 3 to 10 business days. Urgent or expedited reviews can be faster. If your surgery is scheduled within a week and authorization hasn't been submitted, flag it immediately.

You should receive a determination letter

Your insurance company will send you (and your provider) a determination letter approving or denying the request. Keep this letter. If the procedure is approved, note the authorization number — you may need it at the facility on surgery day.

Authorization is not a guarantee of payment

An approved prior authorization means the insurer agreed the procedure is medically appropriate. It does not guarantee they'll pay the full claim — that depends on your plan's benefit design, whether providers are in-network, and whether the actual procedure matches what was authorized.

Denials are common — and frequently overturned on appeal

Initial denial rates for prior authorization requests vary by procedure and insurer, but they're not rare. More importantly, appeal success rates are substantial. A denial is not the end of the process.

Get the specific denial reason in writing

The determination letter should state why the request was denied — lack of medical necessity, missing documentation, experimental designation, or other reasons. This tells you exactly what the appeal needs to address.

Your surgeon can submit a peer-to-peer review request

Your doctor can request a peer-to-peer review — a direct conversation between your surgeon and the insurance company's medical reviewer. This is often the fastest and most effective way to overturn a denial. Ask your surgeon's office to initiate this.

File a formal appeal with clinical documentation

If peer-to-peer doesn't resolve it, file a formal internal appeal. Your surgeon should provide a detailed letter of medical necessity, relevant clinical notes, imaging reports, and any published clinical guidelines supporting the procedure.

You have the right to an external review

If your internal appeal is denied, you can request an external independent review — a review by a third party not affiliated with your insurer. External reviews overturn insurer decisions more often than people expect. Under the ACA, this right is federally protected for most insurance plans.

Don't schedule surgery until authorization is confirmed

A common mistake is scheduling surgery and assuming authorization will follow. If authorization is denied or delayed, you may end up cancelling a procedure the day before — or worse, having a procedure that isn't covered. Confirm the authorization number before confirming your surgery date.

Verify the authorization covers the specific facility

Authorization is often facility-specific. If your authorization was issued for one ASC and the surgery gets moved to a different one, you may need a new authorization. Always verify.

Keep records of every interaction

Document the date, time, and name of every person you speak to about authorization. Keep copies of all letters, fax confirmations, and reference numbers. If a dispute arises later, this documentation is invaluable.