Mich. Comp. Laws § 500.3159
In a dispute regarding an insurer's right to discovery of facts about an injured person's earnings or about his history, condition, treatment and dates and costs of treatment, a court may enter an order for the discovery. The order may be made only on motion for good cause shown and upon notice to all persons having an interest, and shall specify the time, place, manner, conditions and scope of the discovery. A court, in order to protect against annoyance, embarrassment or oppression, as justice requires, may enter an order refusing discovery or specifying conditions of discovery and may order payments of costs and expenses of the proceeding, including reasonable fees for the appearance of attorneys at the proceedings, as justice requires.
MCL 500.3159