The construction of the Himamaylan Emergency Hospital at Himamaylan, Negros Occidental was the pet project of the then late congressman Agustin M. Gatuslao started in the year 1958. The initial construction of the main hospital building, out-patient department, chief of hospital’s quarter and nurses’ dormitory on a 2.5-hectare lot was donated by the Gatuslao family and the construction was lasted for four (4) years.
June 8, 1962, the hospital was inaugurated and opened to the public with an annual budget of Seventy-Four Thousand Eight Hundred Ninety-Eight pesos (P74,898.00) and it started its operation as a 25-bed capacity hospital and an approved plantilla of 25 positions.
July 1, 1964, the hospital was renamed Occidental Negros South General Hospital serving southern Negros whose population were mostly workers from sugar industry.