Any company issuing or executing a motor vehicle liability policy or bond, both as defined in section thirty-four A of chapter ninety, which requests and makes a medical examination of a person injured in an accident involving a motor vehicle, shall, upon request of the injured party or his attorney, furnish said party or attorney with copies of reports of all medical examinations made by said insurer; provided, that such injured party shall, upon request of said insurer, furnish it with copies of reports of all medical examinations and treatment made by his attending physician or physicians.
Mass. Gen. Laws ch. 175, § 113J