MUMBAI : Health insurance segment, which has seen strong growth over the last five years, will continue to witness a higher double-digit growth in the medium term helped by low penetration, according to a report.During FY15-FY20, the segment expanded by a compound annual growth rate (CAGR) of 20 per cent.“We expect the sector to grow at higher double digits in the medium term, with private players growing even faster as they have been gaining market share over public sector firms and also because of the increase in premium prices due to medical inflation," India Ratings and Research said in a report.The agency said it is essential for insurers to maintain adequate buffers over the regulatory minimum so as to be prepared for any unforeseen.