Went tp the er cause doctor wasn't open please estimate my bill?

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I went to the ER tonight because I had abdominal pain and a very black stool that i thought was blood. They did blood tests and a test on the stool I brought in. I do have Blue Cross Blue Shield. I thought it was an emergency because I could have internal bleeding. How much do you think my bill will be? Can the insurance company refuse to help scene it turned out I was ok?

Went tp the er cause doctor wasn't open please estimate my bill?