Four people have been convicted in Houston of conspiring to defraud the Medicare program out of $5.2 million over a three-year period.

A Justice Department statement identifies the four convicted Wednesday as 46-year-old Ezinne Ubani, 45-year-old Caroline Njoku and 47-year-old Terrie Porter, all of Houston, and 55-year-old Mary Ellis of Missouri City.

The federal jury in Houston acquitted 62-year-old Estella Joseph of Houston, all after a 15-day trial before U.S. District Judge Nancy Atlas.

Sentencing is scheduled for July 20-21. Ubani and Ellis could receive up to 20 years in prison, Njoku could get up to 15 years in prison, while Porter could get up to 10 years in prison.