The choice of the number 100 is arbitrary. I'm sure we can find some CTO or whatever you want at spot number 587 that makes 387k a year or whatever. Yes, the top 100 are medical officers, but the government has 17,000 employees that made more than 200k last year. They can't all be medical officers...

https://www.govexec.com/pay-benefits/2015/02/17000-federal-e...