What? what do you mean it is not covered?

I filed with my insurance, the most important insurance company in North Carolina, and the treatment was... denied. What do you mean denied? My son needs help, ABA is a proven treatment, IT WORKS! Well, the insurance company told me that it only works for some individuals, it is not a therapy certain to work, besides it is kind of experimental...
Well, if you have cancer--God forbid-- doesn't the treatment work only sometimes?
So what's the difference here?
The problem is that there are 1 in 90 children in the US who are diagnosed with Autism and there are certainly not 1 in 90 who are diagnosed with : leukemia, diabetes or any other kind of life threatening disease. So, naturally, it is in the insurance company best interest to not cover a treatment that more rather than less children will need.
There I was, left to pay Andrew's treatment with the cost of 30,000$ a year. His therapists estimated he might need between 3-4 years depending on his progress.
Once again, I was devastated and this time, I was enraged too.