Ohio Rev. Code § 4503.15
Owners and lessees of motor vehicles who are residents of this state and hold an unrevoked and unexpired license duly admitting them to the practice of medicine in this state, upon application, accompanied by proof of the issuance to the applicant by this state of a license issued pursuant to section 4731.14 of the Revised Code authorizing the person to engage in the practice of medicine, upon complying with the motor vehicle laws relating to registration and licensing of motor vehicles, and upon payment of the regular license fee, as prescribed under sections 4503.04 and 4503.10 of the Revised Code, and the payment of an additional fee of ten dollars, which shall be for the purpose of compensating the bureau of motor vehicles for additional services required in the issuing of license plates under this section, shall be issued a validation sticker and license plates, or a validation sticker alone when required by section 4503.191 of the Revised Code, for passenger cars and other vehicles of a class approved by the registrar. Such license plates, in addition to the letters and numbers ordinarily inscribed thereon, shall be inscribed with the word "physician."
R.C. § 4503.15