Sarah Monroe once had a relatively comfortable middle-class life.

She and her family lived in a neatly landscaped neighborhood near Cleveland. They had a six-figure income and health insurance through her job. Then, four years ago, when Monroe was pregnant with twin girls, something started to feel off.

"I kept having to come into the emergency room for fainting and other symptoms," recalled Monroe, 43, who works for an insurance company.

The babies were fine. But after months of tests and hospital trips, Monroe was diagnosed with a potentially dangerous heart condition.

It would be costly. Within a year, as she juggled a serious illness and a pair of newborns, Monroe was buried under more than $13,000 in medical debt.

Part of the reason: Like tens of millions of Americans, she had a

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