Allergenic Extracts and Medicare Billing

Introduction to Allergenic Extracts

The American Academy of Allergy, Asthma, and Immunology (AAAAI) and other professional guidelines recommend that allergen extract potency decreases over time, with the rate of potency loss influenced by multiple factors including storage temperature, presence of stabilizers, concentration, proteolytic enzymes, and storage volume 1, 2.
The expiration dates for allergen extracts are established based on stability studies conducted by manufacturers, and these dates should not be exceeded, as stated by the American College of Allergy, Asthma, and Immunology (ACAAI) and the Joint Council of Allergy, Asthma, and Immunology (JCAAI) 3, 4.

Storage temperature is critical - allergen extracts should be stored at 4°C (refrigerated) to minimize potency loss, as higher temperatures accelerate deterioration, according to the American Academy of Allergy, Asthma, and Immunology (AAAAI) 2, 5.
More dilute concentrations of allergy immunotherapy extracts (diluted greater than 1:10 vol/vol) are more sensitive to temperature effects and lose potency more rapidly than concentrated extracts, as noted by the American College of Allergy, Asthma, and Immunology (ACAAI) 6, 7.
The expiration date of any allergen mixture should not exceed the expiration date of the earliest expiring constituent in the mixture, as recommended by the Joint Council of Allergy, Asthma, and Immunology (JCAAI) 1.

The AAAAI/ACAAI/JCAAI guidelines explicitly state: "Extracts beyond the expiration date of the manufacturer are to be discarded", emphasizing the importance of adhering to expiration dates 8, 3.
Manufacturers conduct stability studies with standardized extracts under various conditions, and the resulting expiration dates are based on these studies, as required by regulatory guidelines 4.
Professional guidelines require that "The manufacturer's expiration dates must be followed" as part of proper allergen extract preparation, according to the American Academy of Allergy, Asthma, and Immunology (AAAAI) and the American College of Allergy, Asthma, and Immunology (ACAAI) 8.

Using expired extracts could lead to unpredictable patient responses due to unknown potency, as warned by the American Academy of Allergy, Asthma, and Immunology (AAAAI) 1.
Potential treatment failure due to subtherapeutic dosing is a concern when using expired extracts, as noted by the American College of Allergy, Asthma, and Immunology (ACAAI) 2.