A massive case of insurance fraud spearheaded by a chiropractor has ensnared seven defendants named in a pair of indictments. Riverside County prosecutors allege that $98 million was fraudulently billed to 18 insurance companies. More than $12 million was actually paid out. The charges stem from a workers’ compensation medical ‘mill’ that corrupted the workers’ compensation system, according to a statement from District Attorney Mike Hestrin.