An official website of the United States government
A .mil website belongs to an official U.S. Department of Defense organization in the United States.
A lock (lock ) or https:// means you’ve safely connected to the .mil website. Share sensitive information only on official, secure websites.

News | April 19, 2022

Pre-Authorization and Medical Necessity for Prescription Drugs: What You Need to Know

By TRICARE Communications

Prescription drugs are tools meant to support your overall health. TRICARE has procedures to make sure you get the right prescription drug to treat your condition. You must sometimes work with your doctor to get approval for coverage of certain drugs. Two examples of this are pre-authorization (also known as prior authorization) and medical necessity.
 
“TRICARE uses pre-authorization and medical necessity to make sure your prescription drug is safe, effective, medically necessary, and cost effective,” said U.S. Public Health Service Cmdr. Teisha Robertson, a pharmacist with the Defense Health Agency’s Pharmacy Operations Division. “If you don’t get pre-authorization approval when it’s required, TRICARE may not cover your prescription. Without a medical necessity form, you’ll pay a higher cost for your prescription drug.”
 
Here are some facts about pre-authorization and medical necessity to help you through the process.
 
Pre-authorization
As outlined in the TRICARE Pharmacy Program Handbook, you may need pre-authorization for your prescription if it:  
Express Scripts, the TRICARE pharmacy contractor, sometimes needs more information from your doctor about your prescription before it can be covered by your plan. Express Scripts uses this information to help control costs. They also must make sure the medication is an effective treatment. Express Scripts works with your doctor on these reviews.
 
To find out if your prescription needs pre-authorization, you can go to the TRICARE Formulary Search Tool. Enter the name of your prescription drug in the search tool. If the drug requires pre-authorization, a form will be available for you to download by clicking “Coverage rules apply.” Otherwise, the form won’t appear.
 
Keep in mind, only your doctor can submit the form. They can do this online by following the instructions on the form. Express Scripts will update you on the status of your form. You can also log in to your Express Scripts account or Express Scripts mobile app at any time to check the status. Your approval will apply to network pharmacies, TRICARE Pharmacy Home Delivery, and military pharmacies.
 
Medical necessity
Some drugs require proof from your doctor of medical necessity. Your TRICARE plan has a list of generic and brand-name drugs that TRICARE covers. It’s called the formulary list. TRICARE also covers non-formulary drugs, but at a higher copayment. If evidence of medical necessity is approved for these drugs, you can get your non-formulary drug at the formulary cost, which will be a lower copayment. Medical necessity is also required for active duty service members to get the non-formulary drug at no cost.
 
How can you find out if your prescription drug needs medical necessity? You can find this by looking it up on the TRICARE Formulary Search Tool. As with pre-authorization, only your doctor can submit the form. Your medical necessity approval will apply to network pharmacies, TRICARE Pharmacy Home Delivery, and military pharmacies.
 
Keep in mind, coverage for some non-formulary drugs requires you to use home delivery. You can check the online search tool to confirm.
 
Find more information about pre-authorization and medical necessity on the TRICARE website. If you can’t find a form you need or have questions, reach out to Express Scripts.
 
Remember, you can always check the TRICARE Formulary Search Tool to see how much you’ll pay out of pocket for your prescriptions. You can also check out the TRICARE Pharmacy Program Handbook for everything you need to know about your pharmacy benefit.
 
Would you like the latest TRICARE news sent to you by email? Visit the TRICARE Subscriptions page today, and create your personalized profile to get benefit updates, news, and more.
 
An orthopedic boot with two crutches leaning back against it.

How to manage a third-party liability claim with...

News
Apr. 07, 2026

Recently injured? Whether it was a car accident or a slip on a wet floor, if someone else is at fault, federal...
Read More
Man and woman take a selfie in front of a lighthouse

Understanding the TRICARE claims process

News
Apr. 02, 2026

When you receive a service, medication, or treatment as part of your TRICARE benefit, filing a claim is the...
Read More
Man and woman draw on a piece of paper with a toddler in between them.

Q&A: Getting services through TRICARE’s Extended...

News
Mar. 31, 2026

Military families can have a wide range of needs—and TRICARE has special programs to serve them. One of these...
Read More
Pregnant woman sits in a doctor's office chair while speaking to a standing woman

Expecting a baby? Learn about TRICARE’s maternit...

News
Mar. 26, 2026

Pregnancy can be an exciting time. But it’s also a highly personal experience. Your maternity care choices can...
Read More
Female service member stands in the courtyard of a white building

Learn how to get care at overseas military hospi...

News
Mar. 24, 2026

Do you need to get care at a military hospital or clinic overseas? How you get care depends on whether you...
Read More
Mother and father playing with their child in a yard

TRICARE cost terms: What you need to know about ...

News
Mar. 17, 2026

Health care costs can feel confusing—but they don’t have to be. TRICARE uses specific terms to describe what...
Read More
Child stands in front of a bathroom sink and brushes her teeth.

Set your child up for a lifetime of healthy smiles

News
Mar. 13, 2026

Tooth decay is the most common chronic health problem affecting children in the U.S. today. When cavities...
Read More
Woman in dentist's chair smiles up at dentist who's wearing scrubs and gloves.

Coordinating other dental plan insurance with th...

News
Mar. 12, 2026

Do you or your spouse have another dental insurance plan in addition to the TRICARE Dental Program? Did you...
Read More

April 7, 2026

How to manage a third-party liability claim with TRICARE

Recently injured? Whether it was a car accident or a slip on a wet floor, if someone else is at fault, federal law allows TRICARE to seek payment of your medical costs from that third party. Checking for third-party liability after an accident ensures proper billing coordination, compliance with the law, and that medical costs are covered by whoever is responsible.

April 2, 2026

Understanding the TRICARE claims process

When you receive a service, medication, or treatment as part of your TRICARE benefit, filing a claim is the way your provider gets reimbursed for their services. If you pay for services up front, filing a claim is how you get reimbursed. Read more to learn about when you need to file your own claim, how to view claim information, and how you can appeal a denied claim.

March 31, 2026

Q&A: Getting services through TRICARE’s Extended Care Health Option

Military families can have a wide range of needs—and TRICARE has special programs to serve them. One of these programs is the Extended Care Health Option. ECHO is available to eligible active duty family members with special needs. It offers health care benefits beyond what other TRICARE plans offer.

March 26, 2026

Expecting a baby? Learn about TRICARE’s maternity care options

Pregnancy can be an exciting time. But it’s also a highly personal experience. Your maternity care choices can make a meaningful difference throughout pregnancy, delivery, and postpartum recovery. TRICARE covers a range of maternity care services and provider types. This coverage gives expecting mothers options while ensuring access to care.

March 24, 2026

Learn how to get care at overseas military hospitals or clinics

Do you need to get care at a military hospital or clinic overseas? How you get care depends on whether you live overseas or if you’re just visiting. This article explains how to get care at an overseas military hospital or clinic in both situations.

March 17, 2026

TRICARE cost terms: What you need to know about deductibles, catastrophic caps, and point-of-service fees

Health care costs can feel confusing—but they don’t have to be. TRICARE uses specific terms to describe what you pay and how your benefit works. You may see these terms on your explanation of benefits after getting care. Understanding them helps you plan ahead and avoid unexpected costs.

March 13, 2026

Set your child up for a lifetime of healthy smiles

Tooth decay is the most common chronic health problem affecting children in the U.S. today. When cavities aren’t treated, they create serious problems like pain and infections. Fortunately, you can prevent cavities completely through proper oral care. By following these useful strategies, you can help your child develop healthy dental habits that will benefit them throughout their life.

March 12, 2026

Coordinating other dental plan insurance with the TRICARE Dental Program

Do you or your spouse have another dental insurance plan in addition to the TRICARE Dental Program? Did you know you can use both? Not only could coordinating dental plans provide extra coverage, you could also lower out-of-pocket costs. If you’re wondering how to navigate your dental care between two plans, this article will explain what coordinating those plans means and point you to resources to answer your questions.

March 12, 2026

Easily manage your prescriptions with Express Scripts Pharmacy mobile app

Life is busy, so it’s important you have the prescriptions you need when you need them. The TRICARE Pharmacy Program, administered by Express Scripts, makes staying on top of your prescription drugs easy. How? Through the free Express Scripts Pharmacy mobile app. The app lets you locate TRICARE retail network pharmacies and securely manage your medications by ordering prescriptions, tracking orders, requesting and canceling refills, and completing other tasks.

March 11, 2026

Teledentistry under the TRICARE Dental Program

In our increasingly digital world, health care is evolving, and your dental care is no exception. Teledentistry offers a convenient and accessible way to receive dental care from the comfort of your own home. But what exactly is teledentistry, and what does it mean for you as a TRICARE Dental Program enrollee? Let's demystify teledentistry and clarify what’s covered under the TDP.