Patient admitted to hospital procedure @ outpatient facility

Would you bill "place of service" as inpatient hospital (21) or outpatient facility (22) for the following scenario:

Doctor was consulted for a patient admitted to the hospital. The decision was made to perform a pain management procedure. The patient was then taken to the Pain Clinic at the hospital which is normally considered an outpatient facility.

Please advise - thank you.

Patient admitted to hospital procedure @ outpatient facility