Good startup idea would be to work with medical practices to use AI to automate the disputing of the "downcoding" by insurers.
You would have to leverage the law (if you have one) that involves the state resolving the dispute because otherwise the automated disputes would probably be dropped on the floor. The insurance company has the leverage because they're actually in possession of the money and the contract that gives them stupidly high discretion on how much to pay out.
Doing nothing but flipping the burden, doctors get paid whatever they invoice and insurance have to claw it back would make a lot of this stonewalling bullshit go away. But with an openly corrupt government paid by insurance it'll never happen.