Story highlights Humana says it's leaving the insurance marketplace in 11 states, including Tennessee

Currently, there's only one insurer option as part of Obamacare in 73 of 95 counties

(CNN) Melissa Nance was born and raised in Tennessee. But the native of Blount County, near Knoxville, says she'll move if she has to.

"It's that or die," said Nance, 45. "So what else would you do?"

Nance has an incurable form of cancer called chronic lymphocytic leukemia. Since her diagnosis in 2015, she has gone through chemotherapy and survives on continual treatment. Her immune system is weak, and she often finds herself in the doctor's office with an infection. She keeps a basket full of prescriptions in her living room because "there are too many medications to fit in her bathroom cabinet."

To pay for all of that, Nance is insured by Humana through the Affordable Care Act's marketplace exchange. It's coverage she says she was grateful to have after years of being denied because of her pre-existing condition.

But just last month, Louisville-based Humana said it's pulling out of all 11 states where it sells individual policies, both on the Obamacare exchange and outside it. It cited an "unbalanced risk pool," meaning too few healthy people on its rolls, hurting business.

Read More