When is it appropriate to bill for the professional component of a laboratory procedure when the patient is in a facility? Or is it appropriate? Or, are there some CPT's that modifier 26 applies (ex; surgical pathology CPT 88302) and some that don't? For example 85610 prothrombin time, isn't that 'read' by a machine and then the physician that sees the patient identifies what the value means. Would there be a professional component on 85610 while the patient is in the hospital?