Ohio Rev. Code Ann. § 3923.241
(A) Notwithstanding section 3901.71 of the Revised Code, any public employee benefit plan that provides that coverage of an unmarried dependent child will terminate upon attainment of the limiting age for dependent children specified in the plan shall also provide in substance both of the following:
(1) Once an unmarried child has attained the limiting age for dependent children, as provided in the plan, upon the request of the employee, the public employee benefit plan shall offer to cover the unmarried child until the child attains twenty-six years of age if all of the following are true:
(2) That attainment of the limiting age for dependent children shall not operate to terminate the coverage of a dependent child if the child is and continues to be both of the following:
(C) Nothing in this section shall do any of the following:
(E) As used in this section, "health benefit plan" has the same meaning as in section 3924.01 of the Revised Code and also includes both of the following: