It seems relatively unknown, but in the US you can enroll a child with chronic illness into Medicaid through the "Katie Beckett" [1] program, regardless of household income.
Unfortunately, that process is both annoying and semi long (takes a month or so). Part of the process involved applying for and getting denied medicaid coverage.
All this is to say, if you have a child with a severe long term illness/disability, you can get them extremely generous healthcare even if you are pulling in a large salary.
I've had to do this with my own child, so I know it's really rough. But please, take advantage and get your kiddo all the therapy/medical care they need.
Edit: I should note that not every state has this. Many (23) do. It looks like Indiana is one of the states that does not have it :(. States are required to have passed TEFRA. [2]