jan crawford has more. >> reporter: more than 900,000 people signed up for aetna law in 15 states. but next year, the company says it will offer affordable care act coverage in only four of those states, effectively pulling out of 70% of the counties where it offered coverage and leaving one arizona county near phoenix without any insurers offering obamacare. aetna said it was a simple question of math. with obamacare enrollment numbers below projections, the company reported more than $430 million in los health care exchanges opened in january of 2014, in part because not enough healthy people are signing up. aetna is just the latest of the major national health insurers to announce a pullback. united health care and humana unveiled major cuts. >> this is a red flag for the future of obamacare. >> reporter: larry levitt is with the kaiser family foundation. >> this next open enrollment period will be critical. lot of the current concerns. >> reporter: an administration official said aetna's withdrawal does not change the fundamental fact that the obamacare marketplace will continu

jan crawford has more. >> reporter: more than 900,000 insurance under health care law in 15 states. but next year the company says it will offer affordable care act coverage in four of the states. effectively pulling out of 70% of the counties where it offered coverage. and leaving one arizona county near phoenix without any insurers offering obamacare. aetna said a simple question of math. numbers below prti company reported more than $430 million in losses since the health care exchanges opened in january of 2014. in part because not enough healthy people are signing up. aetna is just the latest of the major national health insurers to announce a pull back. united health care and humana unveiled major cuts. >> this is a red flag for the future of obamacare. >> larry leavitt with kietzer >> the next enrollment will be pivotal. if enrollment grows, concerns will fade away. but if enrollment stag nats. likely to trigger a debate. >> administration official said aetna's withdrawal does not change the fundamental fact that the obamacare marketplace will continue to bring quality covera

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