I have a question on what is the correct billing place of service if a patient is seen in the ER and taken to the operating room for an operation and is never admitted to the Hospital (Hospital A). After the patient has the operation the patient is then transferred to a different hospital (Hospital B). For the operation what is the correct place of service for billing- 23-ER or 22-Outpatient? Is there any documentation out there on this subject? Thank you in advance for any input. Annette