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An anesthetized patient was placed in the prone position on the operating table and draped in the usual manner. An incision was made along the spinal column, from the area of the L1 to L5, and skin and subcutaneous tissues were pinned back to allow access to the L4-L2 vertebral spaces. A separate fascial incision was made to obtain morselized bone graft segments for arthrodesis procedure. Posterior arthrodesis was then performed along the L4-L2 vertebrae. No additional fixation or instrumentation was placed. Incision was then closed, stapled together, and dressed with a sterile dressing. What is the appropriate code for this procedure?
18.The physician performed a right and left heart catheterization with a left ventriculography on 58-year-old male patient. During catheterization, the patient participated in a physiologic exercise study in the form of a bicycle ergometry. How should you code for this service?
20.The patient presents to the laboratory for suspected heavy metal poisoning. The actual amounts of metals detected were not indicated. What laboratory code(s) are appropriate?