Many folks harp about how government insurance doesn't pay enough, and there is some validity to that argument, but without cost controls or other guardrails, the patient is always caught between the payer (private insurance) and the provider. Both are attempting to maximize their profits, the former through "cost plus" accounting, the latter at point of sale/purchase/care.
This might or not be helpful, depending on circumstances: https://www.cms.gov/nosurprises/consumers/new-protections-fo...
Tangentially, this is why global/nomad/world traveller health insurance typically excludes the US specifically from coverage and visitors to the US in many cases will fly home for urgent medical emergencies vs receiving care in country; the economics are simply unpalatable.
[1] https://www.quora.com/Why-would-a-doctor-go-out-of-network-p...
[2] https://www.consumerfinance.gov/rules-policy/medical-debt/
(intimately familiar with the inside mechanics of private insurance from patient advocacy work)