Question: Is it true that if the physician performs continuous inhalation treatment (94644) for less than an hour that we can report 94640? We can't find any CMS directives on this topic. Codify Subscriber Answer: In absence of CMS guidance, you should look to the AMA's instructions in the CPT® manual, as well as the corresponding specialty society, for advice. CPT® notes the following: Because of the parenthetical note below 94644, you are free to report 94640 for inhalation services that last less than an hour. Keep in mind, however, that most payers will not reimburse 94640 in the facility setting, so it would be rare to report this code in an emergency department. This the American Association of Respiratory Care, which publishes the following document on its website: https://www.aarc.org/wp-content/uploads/2014/10/aarc-coding-guidelines.pdf.