I fell down the stairs and had a muscle spasm in my back. Had to go an ER. I had insurance that was considered good and it still cost me $350 for 10 minutes with the doctor and a bottle of muscle relaxers.
It's also about what we paid for my wife's shoulder. Which, like I said, is bad enough on its own.
On the top of that, he didn't charge you for what it was, but for what it wasn't and confirming it.
Take for instance if that muscle spasm actually lead to something darn serious, the doctor ruled that out, that's why he sent you back after 10 mins. For some weird reason (or counter-intuitive economic reasoning which everyone has got), if you had a serious problem, and the doctor had identified it in that 10 mins, then you'd be ok with that billing.
See it this way, if you're tech security contractor and the CEO calls you urgently to come take a look at suspicious behavior on his computer which he thinks might be a hacker hacking his computer, but it turns out to be a quite known windows bug, that doesn't mean you shouldn't charge him your regular fee if it was an actual hacking attempt. You're getting paid for being on call.