Provider and place of service for Lab


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I am new to Lab and am trying to resolve some inquiries that I am baffled on. We are going to have a draw station in a separate suite location-not in but near our Medical group office, the specimens will be sent to our hospital lab to perform the tests, and then they are requesting that the medical group side will be billing.
I am trying to figure out the place of service-I do not think we will meet the qualifications of 81, do we use outpatient then? Also, I was not sure on the physician or medical director or lab director that should be on the claims (as we are set up in the medical group side as a group practice with group NPI).
Any help or direction would be greatly appreciated!:)