In 2002 Corapi filed a "qui tam" False Claims Act lawsuit against Redding Medical Center cardiologist Chae Hyun Moon after Moon informed Corapi that year that he was in immediate need of triple bypass surgery, but then told Corapi that the procedure could wait three weeks. Corapi decided to seek other medical advice; his second doctor determined that he had perfectly clear arteries. Corapi ultimately went to the FBI and filed the suit that was the basis of an FBI raid and a multi-year investigation into Moon's practice.