** Hygeia Healthcare Holdings 6078.HK rises 7% to HK$12.39; set for biggest one-day pct rise since September 19
** Stock hits highest since December 4; on course for third straight session of gains
** Medical services provider plans to repurchase shares in open market for not less than 300 mln yuan ($42.6 mln) to demonstrate confidence in its own business outlook, prospects
** Says current trading price does not reflect stock's intrinsic value or co's actual business prospects
** YTD, stock down 15.7%
($1 = 7.0424 Chinese yuan renminbi)
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))