It was my understanding that this coding of each "component" separately only applies to the pediatric population, and even then, depending on whether or not certain counseling was provided during the visit or not. For the adult population, I believe it's still 90470 reported once for the initial injection, and 90471 reported as many times as there are additional "shots" (not "components").
If < 18, with counseling:
90460 Immunization administration through 18 years of age via any route of administration, with counseling by physician or other qualified health care professional; first vaccine/toxoid component,
90461 Each additional vaccine/toxoid component. (List separately in addition to code for primary procedure.)
If >=18yo, or < 18 but given without counseling:
90471 ? Immunization administration (including percutaneous, subcutaneous, intramuscular, or jet injections); one vaccine (single or combination vaccine/toxoid)
90472 - each additional vaccine (single or combination vaccine/toxoid)
90473 ? Immunization administration by intranasal or oral route; one vaccine (single or combination vaccine/toxoid)
90474 - each additional vaccine (single or combination vaccine/toxoid)
Sources:
http://bit.ly/u5mRMfhttp://bit.ly/gje50x