Froelich drew blood and gave allergy shots without proper credentials or sanitation, authorities say.
There was no reported injury to any of the 4,000 patients who were administered the treatments.
Froelich pleaded guilty to wire fraud in October of 2008 and testified at the trial last fall of Dr. Hartley Thomas, of Valparaiso, Ind., who was the only defendant who went to trial among the 10 individuals, including four physicians, who were charged in a 34-count indictment in February of 2007. Thomas was convicted but died before sentence was imposed.
The allergy business, American Institute of Allergy, operated for about seven years in the Midwest and Southwest.
Several physicians were allegedly involved in the scheme, allowing Froelich and other to bill insurance companies for service under their names without actually supervising the medical procedures.
