Was $10k before or after the insurance negotiated discount? Pre-discount prices mean nothing: I had the same tests ordered twice (needed the results urgently), once through my PCP/HMO and once paid to a walk-in doctor's office in cash. The cash price was $700. My PCP claimed a price of insurance $3500, who then negotiated it down to a "discounted" $710. So the worst of both worlds would have been a high deductible plan.
The way you have those loopholes and you have to watch out for them else you're on the hook for thousands of dollars is nuts. I mean, sure, you _might_ get a good deal or you might get completely screwed. This is absolutely not normal or fair. A society of gotcha's induces a lot of inefficiency. And as much as the US sometimes rails against inefficiency, it seems it's only a problem when you're not used to it.