Health insurer Anthem says it's leaving Maine's health insurance exchange next year due to market volatility and uncertainty.

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The move announced Wednesday means Maine is down to two insurers offering plans on the exchange set up by former President Barack Obama's health care law. Anthem this year rolled back its presence in Nevada, California, Ohio, Wisconsin, Georgia and its home state of Indiana.

Anthem hinted its possible departure in June filings. Company spokesman Colin Manning cited a shrinking individual market and uncertainty over a health insurance tax and federal health care subsidies.

Congress has been mulling GOP proposals to repeal and replace the Affordable Care Act.

Anthem will reduce its health plan offerings and offer one off-exchange plan only available in Aroostook, Hancock and Washington counties.

Insurers faced a Wednesday deadline to commit to selling on federal exchanges.