A party may not call an expert witness to testify unless a written report has been procured from said witness. It is the party's responsibility to take reasonable measures, including the procurement of supplemental reports, to ensure that each such report adequately sets forth the expert's opinion. However, unless good cause is shown, all supplemental reports must be supplied no later than thirty days prior to trial. The report of an expert must reflect the expert's opinions as to each issue on which the expert will testify. An expert will not be permitted to testify or provide opinions on issues not raised in the expert's report.
All experts must submit reports. If a party is unable to obtain a written report from an expert, the party must demonstrate that a good faith effort was made to obtain the report and must advise the court and the opposing party of the name and address of the expert, the subject of the expert's expertise together with the expert's qualifications and a detailed summary of the expert's testimony. In the event the expert witness is a treating physician, the court shall have the discretion to determine whether the hospital and/or office records of that physician's treatment which have been produced satisfy the requirements of a written report. The court shall have the power to nevertheless exclude testimony of the expert if good cause is not demonstrated.
If the court finds that good cause exists for the non-production of an expert's report, the court shall assess costs of the discovery deposition of the noncomplying expert against the party offering the testimony of the expert unless, by motions, the court determines such payment would result in manifest injustice. These costs may include the expert's fee, the court reporter's charges and travel costs.
If the court finds that good cause exists for the non-production of a report from a treating physician, the court shall assess costs of the discovery deposition of the physician equally between the plaintiff and the party or parties seeking discovery of the expert. These costs may include the physician's fee, the court reporter's charges and travel costs.
Ohio. L.C.C.R. 8