Andrew returned for his follow up visit last week with increased pain and edema in his right knee and was scheduled for an arthroscopy. He presents to the surgical center today for a right knee diagnostic arthroscopy with synovial biopsy. Anesthesia is being performed on this 72-year-old male patient by a CRNA with medical supervision by a physician. Other than osteoarthritis, Andrew has essential hypertension, which is well-controlled. Postoperatively the patient was placed in a prefabricated canvas longitudinal knee immobilizer. CPT: 29870 Anesthesia: 01320+ 99100 Concurrent Care Modifier: -OX Physical Status Modifier: P2 HCPCS: L1830