Summary & Overview
HCPCS G9763: HPV Immunization Gap for Adolescents
HCPCS Level II code G9763 documents an adolescent who did not complete the recommended HPV vaccine series between ages 9 and 13 — defined as either lacking two doses with at least 146 days between them or missing a three-dose series. Nationally, recording this gap is important for immunization tracking, quality measurement, and population health efforts to increase HPV vaccine coverage and prevent HPV-related cancers. Key payers included in the national context are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
This publication outlines what G9763 represents, why consistent documentation matters for preventive care and quality measurement, and how payers typically engage with adolescent immunization metrics. Readers will find an overview of clinical context for HPV vaccination timing and series completion, the service setting where this code is most commonly used, and the scope of payers addressed. Benchmark details, payer coverage patterns, and policy updates related to adolescent immunization quality programs are summarized for a national audience. Data not available in the input will be noted where applicable.
Billing Code Overview
HCPCS Level II code G9763 indicates that a patient did not receive at least two HPV vaccines spaced by at least 146 days or a complete three-dose series on or between the patient’s 9th and 13th birthdays. The service type reflected by this code is preventive vaccination status assessment / immunization gap identification. The typical site of service for encounters using this code is outpatient clinic or primary care setting, including pediatric and adolescent preventive care visits.
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Clinical & Coding Specifications
Clinical Context
A 12-year-old patient presents to a pediatric primary care clinic for a routine well-child visit. The electronic immunization record indicates the patient has not completed the HPV series: they have received only one HPV vaccine dose and more than 146 days have not elapsed since that dose, so they do not meet the criteria for a completed 2-dose series between ages 9 and 13. The clinical workflow includes verification of immunization history, review of eligibility for catch-up or accelerated schedules, documentation of shared decision-making with parent/guardian, administration of the HPV vaccine when appropriate, and coding for quality reporting or denominator/exclusion measures. Billing staff may assign G9763 to indicate the patient did not have at least two HPV vaccines (with at least 146 days between the two) or three HPV vaccines on or between the patient’s 9th and 13th birthdays. Typical sites of service are outpatient primary care clinics, pediatric offices, school-based health centers, and community vaccination clinics. Common accompanying tasks include vaccine counseling, consent documentation, vaccine administration in the same visit (if eligible), and scheduling follow-up doses.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when documenting that additional work or time was required for counseling or complex vaccine administration that exceeds typical visit resources. |