Ask Dr. Z

After right heart catheterization, patient was placed on oxygen mask (15L of oxygen for 10 min) and measurements were repeated. We queried the physician to clarify if any drugs were administered (inhaled or infused) to support 93463. He said they use inhaled NO. Here is his response after we asked him to amend his documentation: “There was no NO in this case; the point I am trying to make is that O2 is inhaled gas that can be used for vasoreactivity testing. I think 100% oxygen should be considered the same as NO.” Can you please advise?