The key word is undocumented parents How many more had phony documents?
At Parkland specifically, probably not that many more, only because Parkland is a county/state hospital where the illegals have free access to health care. They don't have to steal someone's identity at Parkland to get treatment, like they do at other hospitals. Parkland - and by Parkland, I mean the Texas and US tax-payers - treats all comers.
I read a figure during the Obamacare debate about the amount of money hospitals have to write off due to identity fraud. I can't remember the exact number, but it was billions, not millions.
My brother is a physician, and the managing partner at a pretty good sized practice. One of the reasons they stopped accepting medicare patients is because of identity theft. It's rarely talked about in the media, precisely because so much of it is committed by illegals.