All medical insurance plans regulated under the Affordable Care Act have an out of pocket maximum per year. This can be as high as $18K.
https://www.healthcare.gov/glossary/out-of-pocket-maximum-li...
https://www.healthcare.gov/glossary/out-of-pocket-maximum-li...
Frankly negotiated prices should just be illegal. They should just provide prices for services. Insurers should have plans on how much they’ll cover you, but they don’t change any pricing. The hidden bullshit smoke and mirrors producing fraudulent pricing that may or may cover you depending on a million different reason is as far from market competition as it gets.