HCPCS G0312: Immunization Counseling for Patients Under 21, 5–15 Minutes

HCPCS Level II code G0312 covers short immunization counseling encounters provided by a physician or other qualified health care professional when a vaccine is not administered on the same date of service for patients under age 21. Nationally, this code identifies a focused preventive counseling service aimed at improving vaccine uptake and documenting professional time spent addressing immunization concerns separate from administration. It matters to payers and providers because it recognizes counseling as a billable service when vaccination is deferred or scheduled for another visit.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical context for G0312, typical sites of service, and how the code is categorized for billing. The publication also summarizes common modifiers associated with outpatient professional services, notes where input data is unavailable, and outlines areas where policy guidance or reimbursement practice commonly affects use of this code. This national-level overview is intended to inform billing staff, compliance officers, and clinical leaders about the purpose and application of G0312 in ambulatory preventive care workflows.

Billing Code Overview

HCPCS Level II code G0312 describes immunization counseling by a physician or other qualified health care professional when the vaccine(s) is not administered on the same date of service for patients under age 21. The service is defined for a counseling session lasting 5 to 15 minutes and is used for Medicaid billing purposes.

Service Type: Immunization counseling / preventive counseling visit

Typical Site of Service: Outpatient clinic, physician office, or other ambulatory setting where counseling is provided without vaccine administration on the same day.

Clinical Context

A caregiver brings a 14-year-old adolescent to a primary care clinic for a counseling visit about human papillomavirus (HPV) vaccination after earlier declining the shot at a school-based program. The visit is scheduled solely to discuss vaccine risks, benefits, and address parental concerns; the vaccine is not administered during this encounter. A pediatrician or nurse practitioner spends approximately 10 minutes providing age-appropriate education, reviewing vaccine schedule, documenting informed refusal or deferred consent, and arranging follow-up immunization appointments. The clinical workflow includes: intake and verification of immunization record, focused vaccine counseling by a qualified health care professional, documentation of counseling content and time spent, and scheduling for vaccine administration on a subsequent date. Billing uses G0312 for Medicaid reporting when the immunization counseling occurs for patients under age 21 and the vaccine is not given the same day, with time typical of 5–15 minutes.

Coding Specifications

Modifier	Description	When to Use
`25`	Significant, separately identifiable E/M service by the same physician on the day of a procedure	Use when a distinct E/M visit occurs the same day as another service (rare for `G0312` because vaccine not given same day).

Taxonomy Code	Specialty	Notes
`208000000X`	Pediatrics	Pediatricians commonly provide vaccine counseling for patients under 21.
`207Q00000X`	Family Medicine	Family physicians counsel adolescents and young adults about immunizations.
`363A00000X`	Nurse Practitioner	NPs frequently perform vaccine counseling and patient education.
`246Q00000X`	Physician Assistant	PAs commonly provide counseling and immunization planning in primary care.
`208000000U`	Adolescent Medicine (subspecialty of Pediatrics)	Specialists in adolescent medicine provide targeted counseling for teenage patients.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z23`	Encounter for immunization	Commonly used to indicate a visit for vaccine counseling, planning, or administration; appropriate when counseling about immunizations occurs.
`Z71.89`	Other specified counseling	Used to capture counseling encounters that are not otherwise specified, including vaccine counseling when appropriate.
`Z00.129`	Encounter for routine child health supervision without abnormal findings	Applies when counseling occurs during routine well-child or adolescent visits for vaccine discussion.
`Z02.5`	Encounter for examination for admission to resume work after absence	Less common; included when counseling relates to immunization requirements for school or activities.
`R69`	Illness, unspecified	Occasionally used when counseling is provided during a visit without a more specific diagnosis; not ideal but sometimes billed in practice.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`99401`	Preventive medicine counseling and/or risk factor reduction intervention; approximately 15 minutes	May be used when broader preventive counseling is provided and payer allows; complements vaccine-specific counseling when scope includes risk-reduction.
`99402`	Preventive medicine counseling and/or risk factor reduction intervention; approximately 30 minutes	Use if counseling extends beyond the brief immunization discussion into more comprehensive preventive 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 or only component of each vaccine/toxoid component	Use when vaccine administration occurs on the same date; not reported with `G0312` because `G0312` is for counseling when vaccine is not administered that same day.
`90461`	Immunization administration through 18 years of age via any route of administration, with counseling by physician or other qualified health care professional; each additional component	Used in conjunction with `90460` for multiple vaccine components when administration occurs that same day.
`G0008`	Administration of influenza vaccine, including counseling, for Medicare beneficiaries	Related as an administration code for immunizations in other payer contexts; `G0312` is specific to counseling without same-day administration for Medicaid under age 21.

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Summary & Overview