I need help....I'm a relatively new coder. Been working for an Internal Medicine office for over a year now. When I had first started, the office manager told me never to code carpal tunnel syndrome unless there was a positive EMG in the patient's chart. This was never an issue until now - I have a patient who the Dr. believes has CTS based on his exam findings (positive Phalen's, positive Tinel's). He is insisting on using the CTS code. Can I use the CTS dx without an EMG or must there be a positive nerve conduction study in order to effectively prove the diagnosis? PLEASE HELP.