Ohio Rev. Code Ann. § 3307.39
(B) The board may make a monthly payment to each recipient of service retirement, or a disability or survivor benefit under the STRS defined benefit plan who is enrolled in coverage under part B of the medicare program established under Title XVIII of "The Social Security Amendments of 1965," 79 Stat. 301 (1965), 42 U.S.C.A. 1395j, as amended, and may make a monthly payment to a recipient of benefits under an STRS defined contribution plan who is eligible for that insurance coverage if the monthly payments are funded through the plan selected by the recipient. The payment shall be the greater of the following: