Therapy Referral vs Prior Authorization: The Difference

Last reviewed: October 7, 2026.

A referral is permission or direction for the client to see you, usually from a primary care provider or the plan. A prior authorization is the payer’s advance approval of specific services: named codes, a number of visits, and a date window. A plan can require one, both, or neither, and having a referral on file does not mean therapy has been authorized.

What each one actually answers

• Referral: who is sending the client and, often, which administrator or provider the plan expects to see them. HealthCare.gov describes a referral as a written order from a primary care doctor to see a specialist or get certain services.

• Prior authorization: whether the plan has approved the planned services before they happen. HealthCare.gov’s preauthorization definition notes that approval is not a promise the plan will cover the cost. Payers also publish their own lists; see, for example, Aetna’s precertification page.

On a claim the two are separate identifiers. A referral number and an authorization number go in different fields, and neither should be swapped for a payer’s provider number or claim number. When a referral routes a client to a behavioral-health administrator, it tells you where the claim goes. It does not tell you which billing NPI and tax ID that administrator recognizes for your practice, so confirm that separately before filing.

“I uploaded the referral. Is the client good to schedule?”

This is the question we get most often, and the honest answer is “not yet.” A referral sitting in your portal or EHR only proves you have the document. Before the first session, we confirm with the payer that it actually received the referral and that an authorization is on file, then record the authorization reference, the number of visits approved, and the start and end dates. On military and HMO-style plans, that confirmation can come back as a single approval covering a fixed visit count over most of a year. That count and window are what you schedule against.

What a prior authorization request needs from the clinician

Payers decide prior authorizations on clinical information, and only the treating clinician can supply it. When we file a request, the clinician usually needs to send:

• Diagnosis code(s) (ICD-10).

• The CPT code(s) to be authorized, such as 90834 or 90837.

• The requested frequency, total number of visits, and start and end dates.

• The initial assessment and treatment plan, plus recent progress notes for a continuing-care request.

For a new client, much of this exists only after the intake session, so the request is often filed right after the first visit. Your biller may not be able to see notes stored inside the EHR, so ask how they want the documents sent rather than assuming a shared chart reaches them.

Where prior authorizations go wrong in practice

• They do not reach backward. In our experience an authorization covers sessions from the approval forward. Sessions held before it was approved generally are not covered by it, so request it before the visits you need it for.

• A plan can start requiring one mid-treatment. We have seen a commercial plan begin requiring authorization for ongoing 60-minute sessions, with its review vendor setting a short deadline for clinical records and denying for untimely submission if they did not arrive. An urgent review was decided within a couple of business days once the records were in.

• The member ID has to be the one the plan uses. A Medicaid managed-care plan voided an approved authorization because the request carried the subscriber’s ID instead of the patient’s Medicaid ID. It had to be resubmitted with the corrected ID.

• It is not a contract. An approval for an out-of-network clinician, sometimes called a network gap exception or single case agreement, is tied to that clinician, the approved services, and the dates. It does not make the practice in network for other clients.

Checklist before the first session

1. Read the client’s plan type and card. HMO, EPO, military and Medicaid managed-care plans are where referral or authorization rules most often apply.

2. Ask the payer two separate questions: is a referral required, and is prior authorization required for this CPT code with this clinician?

3. If a referral is required, confirm the plan received it and record its number and expiration.

4. If authorization is required, gather the clinical items above and submit before the sessions you need covered.

5. Record the authorization reference, approved codes, visit count and date window, and set a renewal reminder well before either runs out.

Once an approval is in hand, read how to count authorization units versus visits so the remaining balance is tracked correctly. For why an electronic eligibility check can miss these requirements, see why verification of benefits is often wrong.

Frequently Asked Questions

Does a referral from the client’s doctor count as prior authorization?

No. The referral shows who sent the client. Prior authorization is a separate payer decision on specific codes, visits and dates, so confirm with the plan whether it is also required.

Can a prior authorization be backdated to cover sessions already held?

Usually not. Plan for approval to apply from the approval date forward and file before the sessions that need it.

What if the plan says no authorization is required?

Write down who said so, when, and for which code and clinician. A “not required” answer is not a coverage or medical-necessity decision, and requirements can change during the year.

Sources

• HealthCare.gov: Referral

• HealthCare.gov: Preauthorization

• Aetna: Precertification overview