One insurer is staying in Pinal County, Arizona, and that means the county has avoided becoming the only one in the country to lack an exchange under the Affordable Care Act.

The Associated Press reports that Blue Cross Blue Shield of Arizona had been debating whether to pull out of Pinal County's marketplace, citing rising costs; other insurers have already made their exit. But in the end the company decided to stay, although its rates will increase by 51 percent in 2017.

Jeff Stelnik, senior vice president of sales, strategy and marketing for Blue Cross Blue Shield of Arizona, was cited in the article saying that most of the premium increase would be offset by new subsidies that will become available to Arizona residents next year. That said, he also warned that the company still has reservations about the financial viability of the exchanges.