I have recently started working at a home health company and am doing some coding. My question is the sequence of the dx codes. If I am looking at it from the home health agency perspective, would the primary code be the "reason" for the home health or therapy the patient is receiving? For instance we had a patient that had vertigo and muscle weakness, and also a UTI. She was receiving physical therapy. However, the company had sent this chart out to an outside coding company and they came up with the UTI as the primary diagnosis. I did not see how that would be appropriate. I would think the vertigo and then muscle weakness would be the first two codes as this was the reason for the therapy. What do you think?