@TonyStark Here's one. This isn't an ACA plan. There's an early paragraph that's a bit misleading. It says that 1 in 7 claims are denied and then gives the figure of ACA plan denials that aren't appealed.

We need more socialized health care, not less.

The United States government funds the development of drugs, then the drug companies turn around and make huge profits on them. If they decide your treatment is too expensive, they can deny it and try to make you pay out of pocket like they did with Christopher McNaughton. He was facing nearly a million dollars of denied claims for his ulcerative colitis and a lapse in his care could have left him with no treatment that would have worked. UnitedHealthcare kept denying his claims and decided to pay for a drug that was four times the cost of the original one his doctors wanted because it matched their arcane rules.

Medicare for All won't solve everything but it would be an improvement.

https://www.propublica.org/article/unitedhealth-healthcare-insurance-denial-ulcerative-colitis