(A) For each member who is contributing to the member-directed plan under section 145.85 of the Revised Code, the public employees retirement system shall credit to a retiree medical account a portion of the employer contribution under section 145.86 of the Revised Code. The portion of employer contribution to be credited shall be determined by the board.

(B) The rights of a member participating in the member-directed plan to reimbursement under a retiree medical account shall be governed exclusively by the provisions of the "public employees retirement system of Ohio retiree medical account." The member shall vest in amounts accumulated in the retiree medical account as provided in the "public employees retirement system of Ohio retiree medical account."