HCPCS G0313: Immunization Counseling for Patients Under 21, 16–30 mins

HCPCS Level II code G0313 denotes face-to-face immunization counseling by a physician or other qualified health care professional for patients under age 21 when vaccines are not administered on the same date of service. The code captures counseling encounters of approximately 16–30 minutes devoted to vaccine education, informed consent discussion, and addressing caregiver or patient concerns. Nationally, such encounters are relevant for documenting preventive care communication and for Medicaid and other payer billing where separate counseling is recognized.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what the code represents, typical sites of service, and the clinical context in which it is used. The publication summarizes common modifiers reported with this code, notes payer coverage patterns where available, and outlines related billing considerations and documentation themes clinicians and billing staff should be aware of. The content provides policy and operational context relevant to billing, claims adjudication, and clinical workflows for ambulatory immunization counseling encounters. Data not available in the input is noted where applicable.

Billing Code Overview

HCPCS Level II code G0313 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 21. The code denotes a counseling visit lasting 16–30 minutes focused on vaccine education, risk/benefit discussion, and answering caregiver or patient questions when the actual immunization is deferred or scheduled for a different encounter.

Service type: Immunization counseling visit
Typical site of service: Outpatient clinic, pediatric or family medicine office, community health center, or other ambulatory care settings where counseling occurs separate from vaccine administration.

Clinical Context

A 15-year-old adolescent presents to a primary care clinic for a school-required vaccine discussion but declines or postpones immunization on that visit. The clinician performs a focused counseling session lasting approximately 16–30 minutes to review vaccine-preventable disease risks, benefits and risks of the recommended vaccine series (for example HPV, meningococcal, or Tdap), address caregiver and patient questions, review contraindications and precautions, and develop a follow-up plan for vaccine administration. The encounter occurs in an outpatient clinic or school-based health center and is documented in the medical record with time spent, medical decision-making elements, informed refusal or deferral discussion, and a planned date or location for vaccine administration (if known). Payers for which Medicaid-specific billing of G0313 applies are billed for counseling only because the vaccine is not given on the same date of service.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier	Use when no modifier applies to the service.
`22`	Increased procedural services

Taxonomy Code	Specialty	Notes
`207Q00000X`	Family Medicine	Primary clinicians who provide adolescent and pediatric immunization counseling.
`207L00000X`	Pediatrics	Pediatricians commonly provide vaccine counseling for patients under 21.
`363A00000X`	Nurse Practitioner	Nurse practitioners in outpatient clinics and school-based health centers frequently provide counseling and vaccine planning.
`363LF0000X`	Physician Assistant	Physician assistants who participate in preventive care and immunization counseling.
`3336C0002X`	Public Health Nurse	Public health clinicians in community or school settings providing immunization counseling and education.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z23`	Encounter for immunization	Primary diagnosis code used to indicate an immunization encounter or counseling related to vaccination planning.
`Z71.89`	Other specified counseling	Used when counseling focuses on preventive health topics such as vaccine education and decision-making.
`Z91.012`	Patient's refusal of vaccination	Applied when a patient or guardian refuses vaccination after counseling; documents refusal as part of medical record.
`R68.89`	Other general symptoms and signs	May be used when counseling addresses non-specific symptoms or concerns that affect vaccine decision-making.
`Z00.129`	Encounter for routine child health examination without abnormal findings	Used when counseling occurs as part of a routine adolescent preventive visit where vaccination is discussed but deferred.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`90460`	Immunization administration through 18 years of age with counseling by physician or other qualified health care professional; first vaccine/toxoid component, can include counseling when vaccine is administered on same date	Performed when the vaccine is administered on the same date with counseling; contrasts with `G0313` which is used when vaccine is not given same day.
`90461`	Immunization administration through 18 years of age with counseling; each additional vaccine/toxoid component	Used for additional vaccine components on same-day administration when counseling is performed.
`99401`	Preventive medicine counseling and/or risk factor reduction intervention(s) provided to an individual; approximately 15 minutes	May be used for counseling related to prevention in some payer settings; `G0313` is Medicaid-specific for immunization counseling when vaccine not given.
`99402`	Preventive medicine counseling; approximately 30 minutes	Applicable when counseling intensity/time approaches 30 minutes and payer rules permit; used alongside preventive counseling workflows.
`G0008`	Administration of influenza virus vaccine	Example of a vaccine administration code that could be billed separately when vaccine is given on a different date than the counseling session.

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Summary & Overview