They usually ask for $50 upfront, but yes, they will see you without being insured. As pertaining to the other answer, on occasion there is a code issue depending on the insurance company, so calling back would be advisable. They will refund billing errors if you've already paid but still attempt to rectify it. It's a pain, but with as many insurance companies as they deal with, it does happen from time to time. If you were charged thousands (emergency room, yes, if you needed that level of care, though, an urgent care would've sent you by self or by ambulance to the ER), your insurance more than likely paid nothing and you need to call them. It's usually not the UC but the billing language your insurance company tries to use to get out of paying.
If you like paying a lot of money. I went with insurance for a simple diagnosis and was billed over $1000 because they dont operate or bill like an urgent care despite disguising as one.
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