Pulse Oximetry

What code can you bill for pulse oximetry when it is needed during a four hour period following a bone marrow biopsy? (Roughly 60 times during the four hours) Is this considered followup for the procedure?

sorry

bundled into the procedure. For a four hour recovery I would assume anesthesia was used so all monitoring is included. Pulse ox only covered if nothing else is done at all except the pulse ox check.