(a) In all civil actions where damages for any medical or hospital expenses are claimed and are legally recoverable for personal injury or death, evidence that the plaintiff's medical or hospital expenses have been or will be paid or reimbursed shall be admissible as competent evidence. In such actions upon admission of evidence respecting reimbursement or payment of medical or hospital expenses, the plaintiff shall be entitled to introduce evidence of the cost of obtaining reimbursement or payment of medical or hospital expenses.
(b) In such civil actions, information respecting such reimbursement or payment obtained or such reimbursement or payment which may be obtained by the plaintiff for medical or hospital expenses shall be subject to discovery.
(c) Upon proof by the plaintiff to the court that the plaintiff is obligated to repay the medical or hospital expenses which have been or will be paid or reimbursed, evidence relating to such reimbursement or payment shall be admissible.
(d) This section shall not apply to any civil action pending on June 11, 1987.