CPT® Code 90666

The CPT® Code 90666 refers to the influenza virus vaccine specifically formulated for pandemic situations. This vaccine is a split virus type, which means it is created from inactivated virus particles that have been chemically disrupted to enhance the immune response. The formulation is preservative-free, indicating that it does not contain the preservative thimerosal or contains only trace amounts of it. This is particularly important for individuals who may have sensitivities to preservatives. The vaccine is administered via intramuscular injection, which is a common route for delivering vaccines to ensure effective absorption into the bloodstream. The pandemic formulation of the influenza vaccine is distinct from interpandemic strains, as it is designed to address new influenza strains that can lead to widespread illness and mortality due to a lack of pre-existing immunity in the population. The production process involves using embryonated chicken eggs to grow the virus, which is then harvested, inactivated, concentrated, and purified to create a safe and effective vaccine. This vaccine is crucial during pandemic outbreaks when the influenza virus can spread rapidly and cause significant health impacts.