The answer: "I don't know"
How can you not know what the cost of a routine procedure like that is? If a simple thing like that can't be give a cost what hope do we have?
Edit: If anyone is curious, $580 but my insurance covered it.
Were I inclined toward cynicism, I'd say that the purpose of the complexity is to make it impossible for anybody to figure out where the money is going, or who is actually gouging whom. Somebody is gouging us, but we'll never know who, and everybody can claim it's somebody else.
In my view, the only way to get to the bottom of where the money is going, is to manage the whole thing. This may be why nationalized systems cost so much less. The people who are gouging would stick out like a sore thumb.
For things like moles, a big chunk is the pathologist's professional fee, as well as the technical fees for whatever additional studies may be needed. "It's just a mole" can become "I'm very sorry, but you have melanoma, we'll be excising most of your cheek on Tuesday."
How is the doctor supposed to responsibly recommend treatment if they don't have the faintest idea of what it costs? If you need some kind of drug in the doctor can think of to that would probably work just fine, would it be really useful if the doctor knew that one was $1/pill in the other was $45/pill? If the difference in the price for the patient ends up being significant maybe that should be something to take into account.
However if you set up the system so that the doctors never actually know what it costs…