** Shares of health insurer Humana HUM.N rise 1.9% to $287.14 premarket

** Co reports Q3 adj. profit of $3.24/shr vs analysts' average estimate of $2.82/shr – data compiled by LSEG

** HUM's quarterly revenue of $32.65 bln beats expectations of $32.01 bln

** Co's quarterly medical cost ratio - percentage of premiums spent on medical care - of 91.1% rises from 89.9% a year earlier

** Annual Medicare Advantage membership outlook now driven by stronger retention and better sales, co says

** Up to last close, stock up ~11% YTD

(Reporting by Sahil Pandey in Bengaluru)

((Sahil.Pandey@thomsonreuters.com))