What Is Prior Authorization — and How Do You Appeal a Denial?

What Prior Authorization Means

Prior authorization — also called pre-authorization, pre-approval, or pre-certification — is a requirement that your health insurer approve a service, medication, or procedure before you receive it. If your insurer denies the prior authorization request, you receive a denial letter before any treatment has occurred.

Prior authorization denials are one of the fastest-growing insurance dispute categories in the United States. Physicians submit tens of millions of prior authorization requests annually, and a significant percentage are denied — many incorrectly.

Why Prior Authorization Denials Happen

Step therapy requirements not met

Many insurers require patients to first try and fail less expensive treatments before approving the prescribed medication or procedure. If the insurer believes you haven't completed these required steps, they will deny the authorization.

Not medically necessary determination

The insurer's reviewer — often using automated criteria — determined the requested service doesn't meet their guidelines for medical necessity.

Missing clinical documentation

The prior authorization request didn't include sufficient clinical information to support the medical necessity determination.

Off-label medication use

The requested drug is being prescribed for a use not in its approved labeling, even if the clinical evidence strongly supports it.

Administrative errors

The wrong procedure code was submitted, the request was submitted to the wrong department, or required forms were incomplete.

Step Therapy — Your Right to an Exception

Step therapy protocols require patients to try and faillower-cost treatments first. However, federal and most state laws provide forstep therapy exceptions when:

• The required drug was previously tried and failed for the patient
• The required drug is contraindicated or likely to cause adverse effects
• The required drug is not clinically appropriate for the patient's condition
• The patient is stable on the prescribed medication and switching would risk harm
• The required protocol would delay appropriate care for a serious or chronic condition

Request a step therapy exception explicitly in your appeal. Your physician must document the clinical rationale for the exception.

How to Appeal a Prior Authorization Denial

Act quickly

Prior authorization denials typically have shorter appeal windows than post-service denials. Urgent care situations may have deadlines as short as 72 hours.

Get your physician involved

Your ordering physician is the most important participant in a prior auth appeal. They need to provide a detailed letter of medical necessity explaining why the specific service or medication is required for your condition and why alternatives are not appropriate.

Request the clinical criteria used

Ask the insurer inwriting for the specific clinical guidelines used to make the determination. You have the right to this information.

Challenge the criteria

If the insurer used proprietary guidelines that differ from recognized medical society guidelines, cite the published clinical evidence that supports your physician's approach.

Request expedited review for urgent cases

If the denial involves care you need urgently, explicitly request expedited external review. Most states require expedited decisions within 72 hours for urgent prior authorization appeals.

How ClaimCompass Helps

ClaimCompass analyzes your prior authorization denial, identifies the specific grounds for appeal — including step therapy exception arguments and medical necessity challenges — and generates a formally written appeal letter citing the applicable clinical guidelines.

Upload your prior authorization denial at myclaimcompass.aifor a free analysis.

Frequently Asked Questions

Can I appeal a prior authorization denial before receiving treatment?

Yes — and you should, as quickly as possible. This is aprospective or pre-service appeal. The insurer must decide within 30 days forstandard requests and 72 hours for urgent requests.

What if I received care and then learned my prior auth was denied?

This is a post-service denial. You can still appeal — file a post-service internal appeal with your clinical documentation and request external review if the internal appeal is denied.

Does my doctor need to submit the appeal?

Not necessarily. You can file the appeal yourself with supporting documentation from your physician. However, having your physician involved — especially for a peer-to-peer review request — significantly strengthens the appeal.

What is a peer-to-peer review for prior authorization?

A peer-to-peer review is a direct conversation between your ordering physician and the insurer's medical reviewer. It is one of the fastest ways to overturn a prior authorization denial because the clinical discussion happens in real time.

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