HCA North Texas will buy Forest Park Medical Center's Frisco hospital for more than $96 million in what is expected to be the first in a string ownership changes for the ailing Dallas-based physician-owned system. The Irving-based subsidiary of the Hospital Corporation of America agreed to a cash purchase of $96.25 million in a deal expected to close by March 31. The hospital has been operating under Chapter 11 bankruptcy since last September, and the deal is subject to approval by a bankruptcy court judge. A hearing on that issue is scheduled for Feb. 18.