** Shares of Niva Bupa Health Insurance Co Ltd NIVA.NS surge 10% to 89.22 rupees, eyes best day since early December
** Health insurer on Wednesday reported 31% growth in fourth-quarter profit, helped by a 25% rise in premium income
** Morgan Stanley calls NIVA's Q4 results "strong"
** Stock rose as much as 14.7% earlier in the day
** NIVA turns YTD positive, last up 5.8%
(Reporting by Nandan Mandayam in Bengaluru)
((Nandan.Mandayam@thomsonreuters.com; Mobile: +91 9591011727;))