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.
 
Different types of dental floss, toothbrushes, bottles, and a syringe on a light blue background

Floss daily for a healthier smile

News
Dec. 17, 2025

While you brush your teeth every day, that’s only part of good dental care. Your toothbrush misses the tight...
Read More
Dentist uses dental equipment on a patient in a white room

TRICARE Dental Program orthodontic coverage: Wha...

News
Dec. 17, 2025

Do you or your child need braces? Do you wonder if the TRICARE Dental Program covers orthodontic care? Here’s...
Read More
Image of woman sitting on sofa on laptop. Text reads: "Participants needed for virtual tricare.mil usability study. Learn if you qualify." TRICARE logo

Give your feedback on tricare.mil: Service membe...

News
Dec. 17, 2025

Would you like to help tricare.mil become even more helpful to you and your family members? Do you have ideas...
Read More
Woman looks at a laptop while she sits at a table.

Access virtual mental health care with TRICARE

News
Dec. 11, 2025

Did you know that you can get virtual mental health services with TRICARE? These options are a great way to...
Read More
Dentist uses a dental pick and a mirror to examine a patient's teeth.

Getting care through TRICARE’s Active Duty Denta...

News
Dec. 09, 2025

Maintaining dental health is a critical part of overall force readiness. Are you on active duty but live far...
Read More
TRICARE logo; How to file claims with TRICARE for Life

How to file claims with TRICARE For Life

News
Dec. 04, 2025

If you have TRICARE For Life, you’ll get health care from Medicare providers. There are certain times you may...
Read More
DHA logo. Text reads: "We are proud to be a grade A facility. Fall 2025: Leapfrog Hospital Safety Grade: A."

18 military hospitals receive Leapfrog's highest...

News
Dec. 03, 2025

The Defense Health Agency announced 18 military hospitals received an "A" rating in the Leapfrog Hospital...
Read More
TRICARE Open Season 2025 Ends Soon! Nov. 10-Dec. 9; Calendar on a phone screen

TRICARE Open Season ends Dec. 9: Last chance to ...

News
Dec. 02, 2025

TRICARE Open Season ends Tuesday, Dec. 9. Now is the time to review your TRICARE coverage for 2026.
Read More

Dec. 17, 2025

Floss daily for a healthier smile

While you brush your teeth every day, that’s only part of good dental care. Your toothbrush misses the tight spaces between your teeth where plaque builds up, and decay can take hold. Flossing fills this gap by getting into those hard-to-clean places. When you floss correctly, you remove harmful plaque and protect your gums from disease. This guide shows you the right way to floss so you can maintain a healthy smile.

Dec. 17, 2025

TRICARE Dental Program orthodontic coverage: What you need to know

Do you or your child need braces? Do you wonder if the TRICARE Dental Program covers orthodontic care? Here’s what you need to know about getting straighter teeth through the TRICARE Dental Program.

Dec. 17, 2025

Give your feedback on tricare.mil: Service members and family members needed for next phase of usability study

Would you like to help tricare.mil become even more helpful to you and your family members? Do you have ideas that will improve the look and content of the website? The Defense Health Agency Usability Lab needs participants to give feedback on how TRICARE conveys benefit information to tricare.mil users.

Dec. 11, 2025

Access virtual mental health care with TRICARE

Did you know that you can get virtual mental health services with TRICARE? These options are a great way to get care when you can’t visit a provider’s office in person. Virtual mental health visits take place through secure technology platforms.

Dec. 9, 2025

Getting care through TRICARE’s Active Duty Dental Program

Maintaining dental health is a critical part of overall force readiness. Are you on active duty but live far away from your nearest military dental clinic? Or do you need dental care that your military dental clinic can’t provide? You should know that TRICARE offers the Active Duty Dental Program. This program allows active duty service members to get care through civilian providers under certain circumstances.

Dec. 4, 2025

How to file claims with TRICARE For Life

If you have TRICARE For Life, you’ll get health care from Medicare providers. There are certain times you may need to file your own claims with WPS Government Services, the TFL contractor. Here’s what you need to know about when to file claims when you have Medicare and TFL.

Dec. 3, 2025

18 military hospitals receive Leapfrog's highest Hospital Safety Grade

The Defense Health Agency announced 18 military hospitals received an "A" rating in the Leapfrog Hospital Safety Grade assessment for fall 2025. These high grades reflect DHA’s commitment to transparency and continuous improvement in providing high-quality care to its patients. 

Dec. 2, 2025

TRICARE Open Season ends Dec. 9: Last chance to change your health plan for 2026

TRICARE Open Season ends Tuesday, Dec. 9. Now is the time to review your TRICARE coverage for 2026.

Nov. 24, 2025

Review your FEDVIP dental and vision coverage during Federal Benefits Open Season

Do you want dental or vision coverage along with your TRICARE health plan? Coverage through the Federal Employees Dental and Vision Insurance Program may be a good choice for you. Here’s what you need to know about FEDVIP and how to sign up during Federal Benefits Open Season, which runs from Nov. 10 through Dec. 8 this year.

Nov. 21, 2025

Defense Health Agency patients and families are our highest priority

The Defense Health Agency continues to fully cooperate with the ongoing criminal investigation being conducted by the Army Criminal Investigative Division regarding a military medical provider working at the Carl R. Darnall Army Women’s Health Center. Our first concern is for the patients and families affected by this situation. We know this news has created concerns and questions from our patients and our military community. Our patients and their families remain our highest priority as we respond to this situation.