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.
 
A person typing on a laptop with their left hand while holding a mug in their right hand.

Find a TRICARE provider near you

News
Jun. 18, 2026

The first step in getting healthcare is to know where to go. TRICARE has many resources to help you find the...
Read More
A person's legs in dark pants and socks in a kitchen, surrounded by cardboard boxes. "Kitchen" is written on one of the boxes.

Moving with TRICARE: A game plan for success

News
Jun. 16, 2026

When you move, keeping organized is key. Between the boxes and bubble wrap, take time to make sure your...
Read More
Woman holds yellow envelope package.

TRICARE offers home delivery for prescription drugs

News
Jun. 11, 2026

TRICARE has an easy way for prescription drugs to come right to your doorstep: TRICARE Pharmacy Home Delivery...
Read More
Three service members smile while walking together

Take charge of your health: men’s preventive ser...

News
Jun. 09, 2026

When’s the last time you went to the doctor for a check-up? Now’s a great time to check in on your health and...
Read More
Picture of a man standing behind a woman as they smile

Understanding TRICARE deductibles: What you need...

News
Jun. 04, 2026

Have you ever heard the word "deductible" and wondered what it means? You aren’t alone. Healthcare cost terms...
Read More
"CHECK IT OUT! www.tricare.mil/publications;" Screenshots of the TRICARE Plans Overview Fact Sheet

Get to know your TRICARE health plan with the TR...

News
Jun. 02, 2026

Learn about your TRICARE health plan today with a simple tool that makes it easy. The TRICARE Plans Overview...
Read More
A dentist demonstrates toothbrush technique on a dental model.

The important connection between diabetes and or...

News
May. 27, 2026

According to the Centers for Disease Control and Prevention, about 12 out of every 100 Americans have...
Read More
Overhead picture of three lunchboxes full of healthy food

Snacking your way to a healthier mouth

News
May. 27, 2026

You may be flossing and brushing regularly, but did you know the snacks you eat also play a significant role...
Read More

June 18, 2026

Find a TRICARE provider near you

The first step in getting healthcare is to know where to go. TRICARE has many resources to help you find the right healthcare provider for you and your family. Depending on your plan, you’ll get care from a military hospital or clinic or a civilian provider.

June 16, 2026

Moving with TRICARE: A game plan for success

When you move, keeping organized is key. Between the boxes and bubble wrap, take time to make sure your TRICARE benefits are ready to come along. Here are a few steps you can follow on your journey from getting ready to arriving at your new location.

June 11, 2026

TRICARE offers home delivery for prescription drugs

TRICARE has an easy way for prescription drugs to come right to your doorstep: TRICARE Pharmacy Home Delivery. It's a convenient and simple way to get up to a 90-day supply of your prescriptions.

June 9, 2026

Take charge of your health: men’s preventive services covered by TRICARE

When’s the last time you went to the doctor for a check-up? Now’s a great time to check in on your health and learn about the men’s health and preventive services that TRICARE covers. TRICARE covers a range of screenings and services designed to keep you healthy at every stage of life.

June 4, 2026

Understanding TRICARE deductibles: What you need to know

Have you ever heard the word "deductible" and wondered what it means? You aren’t alone. Healthcare cost terms can be tricky, but we’re here to make them easy to understand. A deductible is a set amount of money you must pay out of pocket before TRICARE starts to pay for your care. Knowing your deductible is the first step in planning your family's healthcare budget.

June 2, 2026

Get to know your TRICARE health plan with the TRICARE Plans Overview Fact Sheet

Learn about your TRICARE health plan today with a simple tool that makes it easy. The TRICARE Plans Overview Fact Sheet is your go-to resource for understanding what you and your family members can expect when getting care with your health plan.

May 27, 2026

The important connection between diabetes and oral health

According to the Centers for Disease Control and Prevention, about 12 out of every 100 Americans have diabetes. However, many people underestimate how important their oral health is in managing their diabetes.

May 27, 2026

Snacking your way to a healthier mouth

You may be flossing and brushing regularly, but did you know the snacks you eat also play a significant role in the state of your dental health? Frequent snacking on certain foods can expose your teeth to harmful acids and sugars, leading to cavities and gum disease.

May 26, 2026

Take charge of your skin health: How TRICARE supports skin cancer screening and treatment

As summer approaches and outdoor activities increase, it’s essential to protect your skin from harmful ultraviolet rays. TRICARE is committed to supporting your skin health by covering skin cancer exams and providing resources for prevention and treatment.

May 22, 2026

Maintaining oral health during pregnancy

Pregnancy brings many changes to your body, and your mouth is no exception. Hormonal shifts, morning sickness, and changes to diet can all affect your oral health. The good news is that dentists can provide safe, effective care throughout your pregnancy.