u.s. health insurer anthem inc antm.n say monday long offer obamacare plan nevada state exchange stop offer plan nearly half georgia counties next year move come republican senators last month fail repeal replace obamacare former president barack obama signature healthcare reform law create uncertainty program provide health benefit 20 million americans fund manage 2018. hundreds u.s. counties risk lose access private health coverage 2018 insurers consider pull market come months nevada say june residents 14 counties 17 state would access qualify health plan state exchange anthem decision leave state entirely increase number bare counties state nevada insurance commissioner barbara richardson say statement insurer still offer catastrophic plan purchase outside state exchange available consumers 30 years old low income anthem also say offer obamacare plan 85 georgia 159 counties say counties continue offer plan mostly rural counties would otherwise health insurance coverage residents say change impact anthem medicare advantage medicaid employer-based plan either state company say last week pull 16 19 price regions california 2018 offer obamacare options year anthem blame move part uncertainty whether trump administration would maintain subsidies keep cost u.s. president donald trump last week threaten cut subsidy payments make plan affordable lower-income americans help insurers keep premiums efforts repeal law sign predecessor president barack obama fail congress trump repeatedly urge republican lawmakers keep work undo obama affordable care act anthem pare back obamacare offer nevada georgia