Mr. Johnson met the couple, Earron Starks, 53, and Carlicha Starks, 44, through a woman he was having an extramarital affair with while working at a VA hospital in Mechanicsburg, W.Va.
Mr. and Ms. Starks ran Ekno Medical Supply and Collondale Medical Supply from 2009 to 2019.
The couple has pleaded guilty to paying kickbacks on $7 million worth of contracts to Florida VA facilities; after their arrest, they led officials to Mr. Johnson, 56.
In June 2019, the couple wore recording equipment and handed a binder full of $5,000 in cash to Mr. Johnson.
Mr. Johnson is at least the third Philadelphia VAMC employee to face corruption charges since 2020, according to Stars and Stripes.