Sec. 252. "Nonprofit hospital corporation" means a corporation that:
(1) is organized and doing business under IC 23-17;
(2) is authorized by the corporation's charter to and does own and operate a hospital;
(3) is licensed under IC 16-21; and
(4) operates the hospital as a charitable or benevolent institution making the hospital's services available to persons unable to pay to the extent of the hospital's financial ability to do so.