I have a Pathology group who has partnered with a Cytology Lab, the Cytology Lab currently does not have any contracts with the insurance companies. They have worked out an agreement with the Pathology group to bill under the Pathology groups INN EIN/NPI. What would be the correct way to bill the Cytology claim? My thought is that we would be the INN Pathology group in Box 33 with the Cytology Lab as the service location in box 32 with a POS code of 81. Or should we bill the Pathology group in box 32 and 33 with a POS 11 like they do with all their other claims? If anyone could shed some light on this it would be helpful.