If false Medi-Cal Claims are written by a doctor before he actually sees the patient
to used at some future time, to make things more efficient perhaps, is that in and of itself illegal? He has them, he just has not submitted them yet, but they are ready to be sent.
It is critical you do not engage in any unlawful activity or speak to anyone other than an attorney while collecting evidence as a potential whistleblower. You need to consult with a healthcare attorney who can analyze if violations are truly occurring and what next steps to take. Many schemes exist - the latest I've read about involved a physician who would issue prescriptions for $6,000 wheelchairs, who would take a cut from the company that distributed them.