Question: Georgia Subscriber Answer: In the case of FluMist, a one component vaccine, 90460 (Immunization administration through 18 years of age via any route of administration, with counseling by physician or other qualified health care professional; first or only component of each vaccine or toxoid administered) would be the correct code to use. If it was a nurse-only "flu clinic" encounter, 90473 (Immunization administration by intranasal or oral route; 1 vaccine [single or combination vaccine/toxoid]) would be the correct code. Code +90474 (...each additional vaccine [single or combination vaccine/toxoid]) would only be accurate if there was another vaccine given as a nurse-only visit at the same encounter.