Adult Immunization Status (AIS)

The percentage of members 19 years of age and older who are up-to-date on recommended  routine vaccines for influenza, tetanus and diphtheria (Td) or tetanus, diphtheria and acellular pertussis (Tdap), zoster and pneumococcal.

Why it Matters

Vaccines are recommended for adults to prevent serious disease, hospitalization and death. Specifically, the Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices (ACIP) recommends adults ages 19 and older receive an annual influenza vaccine and booster doses every 10 years of either tetanus and diphtheria (Td) or tetanus, diphtheria and acellular pertussis (Tdap) vaccine.1 ACIP also recommends routine zoster vaccination for adults ages 50 and older and pneumococcal vaccination for adults ages 65 and older. 1 Many adults are not fully vaccinated and improving adult vaccination is a national priority.2 For instance, the National Adult Immunization Plan outlines a set of actions needed to achieve optimal prevention of infectious disease and specifically recommends regular monitoring of recommended adult vaccines.2

*Developed with support from the Department of Health and Human Services (DHHS), Office of the Assistant Secretary for Health (OASH), National Vaccine Program Office (NVPO).


NCQA published a special report summarizing HEDIS measurement year 2020 results for eight measures that leverage electronic clinical data, including this measure. This report can be found here:


  1. Freedman M.S., Hunter P., Ault K., Kroger A. 2020. “Advisory Committee on Immunization Practices Recommended Immunization Schedule for Adults Aged 19 Years or Older — United States, 2020.” MMWR Morb Mortal Wkly Rep 2020;69:133–135. DOI:
  2. Williams W.W., P. Lu, A. O’Halloran, et al. 2017. “Surveillance of Vaccination Coverage among Adult Populations—United States, 2015.” MMWR Surveill Summ 66 (No. SS-11):1–28. DOI:
  3. U.S. Department of Health and Human Services National Vaccine Program Office. 2019. “National Adult Immunization Plan.”
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