She got a $911,400 bill for treatment that was supposed to be free. The autism-therapy industry is booming—and so are the billing abuses.

Insurers warn of fraud and exorbitant charges from providers, including one that stuck a parent with a surprise $911,400 bill.

Insurers warn of fraud and exorbitant charges from providers, including one that stuck a parent with a surprise $911,400 bill.

Insurers warn of fraud and exorbitant charges from providers, including one that stuck a parent with a surprise $911,400 bill.