OPEN MINDS The Behavioral Health & Social Service Industry Analyst Industry News Columbia Healthcare Corporation, based in Louisville, and HCA Hospital Corporation of America, based in Nashville, have merged to create one of the largest health care systems in the country. The new company, Columbia/HCA Healthcare Corporation will own 190 hospitals with 42,000 beds in 26 states, according to and article, "Columbia/HCA-Hospital Merger Creates Health Giant," by Laura Buterbaugh that appeared in the October 21, 1993 issue (p.15) of Medical Tribune. Officials of both companies estimate . . .