In California, the insurance company is entitled to a proportionate share if the proceeds are insufficient to compensate the victim fully. For example, if you suffered $100,000 in damages but only recovered $50,000, then the health insurance company would be entitled to 50% of the amount they paid.
However, this changes based on the language of your health plan, if your employer provided the health plan, and if your employer funds the plan.
Before settling any accident claim, you may want to consult an experienced car accident attorney to determine whether or not reimbursement from your health insurance company will wipe out your settlement, leaving you with no compensation.