KATY, Texas — A 49-year-old Texas woman was the biggest recipient of a Veterans Affairs' program to reimburse eligible out-of-pocket prescription expenses in the world.

Investigators would later learn that 49-year-old Tammy Wilson of Katy, Texas, defrauded the Department of Veteran Affairs (VA) of more than $640,000, according to the U.S. Attorney's Office.

Wilson, according to a federal indictment, is the widow of a military veteran who allegedly died of service-related injuries. This made her eligible to participate in the Civilian Health and Mental Program of the Department of Veterans Affairs (CHAMPVA) Program — a comprehensive health care program in which the VA reimburses for eligible out-of-pocket prescription expenses.

Federal prosecutors say Wilson submitted falsified prescription summaries between 2013 and 2017 and claimed to have paid more than $640,000 for prescription medications which was later reimbursed by the VA. The indictment alleges the pharmacies never dispensed the prescriptions that Wilson had claimed.

"During the course of the scheme, Wilson was the biggest recipient of CHAMPVA funds in the world, according to the charges," read a statement from the U.S. Attorney's Office in the Southern District of Texas.

A federal grand jury returned a three-count indictment on September 19, 2019, charging Wilson with one count each of mail fraud, health care fraud, and making a false statement relating to health care matters. She made her initial appearance before U.S. Magistrate Judge Nancy Johnson earlier today.

If convicted, she faces up to 20 years in federal prison and a possible fine not to exceed $250,000.