Does a confirmed Chapter 13 stop any creditor on the petition from filing a complaint for fraud for the same debt with the Department of Insurance?

The creditor missed its opportunity to object to the plan, and this fact can be used as a defense to the fraud allegations. However, it's just a defense; it probably won't be enough to get the case dismissed. You need to hire a lawyer to represent you in this case.

11 USC sec 362 stays civil actions to collect debts and enforce contracts, it does not stay criminal or administrative actions which are not directed to collecting debts (such as your action to revoke your license). Bankruptcy and the automatic stay are Federal law and are generally exempt from regulation by state statutes. An objection or adversary proceeding based on fraud in the bankruptcy court only goes to the issue of whether the debt is dischargeable in the bankruptcy. Not whether the debt is civil or criminal fraud under state law. Now there is always an issue of debtor harassment by a stayed creditor. If there really isn't any evidence to support the charge at the state DOI, then you should notify the creditor that the only rationale purpose for this action is obviously to force you to repay a dischargeable debt and that you will seek sanctions from the bankruptcy court. Bankruptcy court has a big advantage over state court because if you win, the creditor has to pay your legal costs There is also the possibility of a defamation case in state court. If the creditor lied to the DOI - and you can prove it (since complaints are generally in writing, this should be easy to ascertain), you can sue them for libel.

Bankruptcy does not prevent a creditor from filing a criminal complaint against a debtor. Bankruptcy only deals with the discharge of civil debt, not criminal offenses. See 11 USC sec 523 for further information about the relationship between bankruptcy and the criminal justice system.

If the plan was confirmed and the debt included in the plan, then it cannot be revived by any administrative hearing. That said, fraudulent conduct evidence can be heard and the discharge of the debt would not excuse fraud if proven.

You need an attorney, and the correct place for the fraud protest should have been in an adversary action in the bankruptcy, The fact that it was not made in that proceeding would generally be a defense and preclude any other action in any other forum for the debt. I would need the details, however, to render a firm opinion.