Ohio Rev. Code Ann. § 3937.28
(A) A notice of cancellation of a policy of medical malpractice insurance shall not be issued by any licensed insurer unless it is based on one of the following grounds:
(B) The notice of cancellation required by this section shall be in writing, be mailed both to the insured at the insured's last known address and to the insured's agent, and contain all of the following: