ABSTRACT
Vaccination for Human Papillomavirus (HPV) is important to reduce rates of cervical and oropharyngeal cancer. We aimed to evaluate if a program to initiate HPV vaccination at 9 years improved initiation and completion rates by 13 years of age. Data on empaneled patients aged 9-13 years from January 1, 2021 to August 30, 2022 were abstracted from the electronic health record. Primary outcome measures included HPV vaccination initiation and series completion by 13 years of age. The secondary outcome measure was missed opportunities for HPV vaccination. In total, 25,888 patients were included (12,433 pre-intervention, and 13,455 post-intervention). The percentage of patients aged 9-13 with an in-person visit who received at least 1 dose of HPV vaccine increased from 30% pre-intervention to 43% post-intervention. The percentage of patients who received 2 doses of vaccine increased from 19.3% pre-intervention to 42.7% post-intervention. For the overall population seen in-person, initiation of HPV vaccination by age 13 years increased from 42% to 54%. HPV completion increased as well (13% to 18%). HPV vaccination initiation at 9 years of age may be an acceptable and effective approach to improving vaccination rates.