Ohio Rev. Code Ann. § 5165.522
(A) Except as provided in division (B) of this section, an exiting operator shall file with the department of medicaid a cost report not later than ninety days after the last day the exiting operator's provider agreement is in effect or, in the case of a voluntary withdrawal of participation, the effective date of the voluntary withdrawal of participation. The cost report shall cover the period that begins with the day after the last day covered by the operator's most recent previous cost report required by section 5165.10 of the Revised Code and ends on the last day the exiting operator's provider agreement is in effect or, in the case of a voluntary withdrawal of participation, the effective date of the voluntary withdrawal of participation. The cost report shall include, as applicable, all of the following: