When you, the nurse or medical assistant spend time helping a patient with an inhaler demo or evaluation, keep in mind these things:
If you are providing separate education after the patient has received an inhalation treatment on the same day, you will be able to report 94664 twice, the second code appended with a ‘59’ modifier to indicate that the procedure was for teaching purposes.
The bottom line, documentation and medical necessity for the services performed. You are entitled to payment (about $16.00) for this service each time it is provided. The approved diagnosis would always be a respiratory code. As example: 493.01 Extrinsic asthma, with status asthmaticus or 493.22, chronic obstructive asthma.