What services are included in code 94644 and 94645 for continuous inhalation treatment with aerosol medication?


These CPT codes represent hourly charges for delivery of therapy. The initial hour code—94644—will include set-up time, device/supplies and medication. Each additional hour of therapy is represented by CPT code 94645. For less than one hour of treatment, neither code 94644 or 94645 should be reported.

If the service is performed for less than one hour, code 94640 may be reported. This code describes a treatment administered several times a day at short intervals (e.g., 10 minutes), whereas continuous inhalation treatment (94644, 94645) is administered for longer periods and then discontinued. A higher dosage of medication and different equipment are used.

Also note that CPT code 94644 uses the term “first hour,” and not “up to 1 hour.” This restricts its use to only procedures lasting 60 minutes. This also applies to the add-on code 94645.


CPT® copyright 2021 American Medical Association (AMA). All rights reserved.

Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.

CPT is a registered trademark of the American Medical Association.