Often a nurse or medical assistant helps a patient with an inhaler demo or evaluation, but whenever coding it, you must keep these three areas in mind: the type of device used, documentation requirements, and qualifying modifiers. Follow these four tips from our experts to understand why some payers might deny payment for the service — and what you can do to win deserved dollars.

1. Categorize the Diskus Correctly

Many physician offices use the Advair Diskus for their patients, which is an aerosol generator. “An aerosol generator is a device that produces airborne suspensions of small particles for inhalation therapy,” explains Peter Koukounas, owner of Hippocratic Solutions medical billing service in Fairfield, N.J. If the nurse or medical assistant taught someone to use an Advair Diskus — or any other diskus — you should report 94664 (Demonstration and/or evaluation of patient utilization of an aerosol generator, nebulizer, metered dose inhaler or IPPB device).

The physician starts a patient with asthma (493.00, Extrinsic asthma; unspecified or 493.20, Chronic obstructive asthma; unspecified) on Advair. A nurse then teaches the patient how to use the Diskus. According to CPT guidelines, you should report 99201-99215 for the office visit (depending on whether you’re treating a new or established patient). Then report 94664, but don’t append a modifier, says Alan L. Plummer, MD, professor of medicine, Division of Pulmonary, Allergy, and Critical Care at Emory University School of Medicine in Atlanta.

CMS transmittal R954CP indicates that modifier 25 (Significant, separately identifiable E/M service by the same physician on the same day of the procedure or other service) applies only to E/M services performed with procedures that have a global fee period. Code 94664 does not have a global fee period, which is why you don’t automatically include modifier 25.

Despite what CMS guidelines might…