Defendant appeals as of right from an order of summary disposition granted in favor of plaintiff pursuant to MCR 2.116(C)(9) and (10).
i
Plaintiff was involved in an automobile accident on April 13, 1982. Upon the recommendation of Dr. Roberto Williams, the internist who examined plaintiff on the day of the accident, plaintiff was hospitalized from April 14 through April 30, 1982, from May 4 through May 21, 1982, and again from June 1 through June 18, 1982. Plaintiff also received outpatient physical therapy from May 24 through May 28, 1982. Plaintiff’s medical expenses amounted to $25,059.29.
Defendant, with whom plaintiff had contracted for full comprehensive medical expenses under a no-fault policy of insurance, received itemized billings for plaintiff’s medical expenses by July 7, 1982, but refused to pay them. Defendant’s refusal *185 was based on a second examination, on July 10, 1982, performed by an orthopedic surgeon of defendant’s choosing, Dr. Mitchell C. Poliak. From this second examination, plus Dr. Poliak’s evaluation of Dr. Williams’ report together with plaintiffs medical records submitted by November 18, 1982, Dr. Poliak opined that hospitalization and much of the testing performed on plaintiff had been unnecessary.
Plaintiff sued defendant on February 7, 1983, for failure to pay his medical expenses. The trial court granted summary disposition in favor of plaintiff pursuant to MCR 2.116(C)(9) and (10) as to defendant’s claim that it should not have to pay the medical expenses because the treatment was unnecessary and the expenses therefore unreasonable, ruling that defendant’s claim was not a valid defense to a contract action and that only damages were at issue. Defendant conditionally waived a jury trial. The trial court heard evidence on the issue of damages and awarded plaintiff $25,059.29 in medical expenses plus twelve percent judgment interest, but declined to award plaintiff penalty interest or attorney fees. Defendant appeals as of right. Plaintiff cross-appeals.
ii
On appeal, defendant attacks the trial court’s finding that defendant’s failure to state a valid defense warranted a grant of summary disposition pursuant to MCR 2.116(C)(9). Defendant relies on MCL 500.3107; MSA 24.13107 to argue, based on Dr. Poliak’s second evaluation, that defendant had stated a valid defense in its argument that services rendered to plaintiff were not "reasonably necessary” and hence could not have resulted in "reasonable charges” triggering its liability for pay *186 ment of benefits under the no-fault act, MCL 500.3105; MSA 24.13105.
We disagree with this contention. The reasonableness of medical expenses cannot be used as a defense to liability in a no-fault accident case. Strong policy considerations support this position, since an accident victim would be held to an impossible standard of medical knowledge if required to determine that his or her doctor’s orders were "reasonably necessary” before accepting treatment. Therefore the defense of reasonableness as to plaintiffs medical expenses was legally insufficient — so untenable that no factual development would have prevented plaintiffs right to recovery —and the trial court properly granted summary disposition pursuant to MCR 2.116(C)(9).
Karaskiewicz v Blue Cross & Blue Shield of Michigan,
Defendant also argues that summary disposition should not have been granted pursuant to MCR 2.116(0(10) because the dispute over the reasonableness of plaintiffs medical expenses constituted á genuine issue of material fact.
The disagreement over the reasonableness of the medical expenses did not constitute a genuine issue of material fact. Defendant never, disputed that plaintiff was treated by Dr. Williams for injuries arising from the accident of April 13, 1982, or that plaintiff was billed $25,059.29 for his medical care, and defendant never argued that the charges for these services were excessive. As plaintiffs no-fault insurer, defendant was liable for payment of benefits for plaintiffs injuries, because such injuries arose "out of the ownership, operation, maintenance or use of a motor vehicle,” MCL 500.3105(1); MSA 24.13105(1). Defendant was required to pay such benefits within thirty days of
*187
receiving "reasonable proof’ of injury and amount of loss, failure to pay giving rise to a rebuttable presumption of unreasonable refusal or undue delay. MCL 500.3142(2); MSA 24.13142(2);
Bradley v
DAIIE,
As there was no issue of liability, there were no genuine issues of material fact except as to the amount of damages, and the question of reasonableness went not to the issue of liability but to the issue of damages. However, defendant waived the right to a jury trial on the issue of damages, thereby precluding a jury fact finding as to the reasonableness of plaintiffs expenses. See
Nelson v DAIIE,
m
Defendant also argues that the trial court abused its discretion by excluding evidence that plaintiffs medical bills had already been paid by Blue Cross/Blue Shield. We disagree.
The evidence was barred by the collateral source rule.
Blacha v Gagnon,
IV
On cross-appeal, plaintiff argues that he is entitled to receipt of twelve percent penalty interest pursuant to MCL 500.3142(2); MSA 24.13142(2). We agree.
Although the trial court found that plaintiff had a valid contract with defendant, that plaintiff’s medical expenses were reasonable, and that defendant had refused to pay those expenses, the court refused to award penalty interest. Such refusal was error, since the only basis for denying penalty interest would have been plaintiff’s failure to submit reasonable proof of injury and the amount of loss sustained.
Bradley, supra
at 50;
Cook v DAIIE,
v
Plaintiff also argues on cross-appeal that the trial court erred by denying his request for attorney fees. We disagree. A bona fide factual uncertainty precludes the characterization of defendant’s conduct as unreasonable refusal or unreasonable delay warranting the imposition of attorney fees under MCL 500.3148(1); MSA 24.13148(1);
Liddell v DAIIE,
Affirmed as to defendant’s issues on appeal. Affirmed as to plaintiff’s issue of attorney fees on cross-appeal. Reversed as to plaintiff’s issue of penalty interest, and remanded to the trial court for computation of such interest in conformity with this opinion.
Affirmed in part, reversed in part, and remanded.