G8482 Influenza Immunization | HCPCS Reimbursement

HCPCS Level II code G8482 denotes documentation that an influenza immunization was administered or previously received. This code is used to record immunization status for patients and to support public health reporting, quality measurement, and clinical workflows. Nationally, accurate capture of influenza immunization status is important for population immunization tracking, preventive care quality measures, and Medicare and commercial payer reporting programs.

Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of what the code represents, typical settings where it is used, and the clinical context for reporting influenza immunization status. The publication also outlines common modifiers associated with the service line and notes when additional documentation is typically required.

This summary provides actionable reference material for billing staff, compliance teams, and clinical coders seeking to ensure consistent reporting of influenza immunization status across outpatient and ambulatory settings. Data not available in the input will be identified where relevant.

Billing Code Overview

HCPCS Level II code G8482 indicates Influenza immunization administered or previously received. This service represents documentation that a patient has received an influenza vaccine either during the current encounter or prior to it.

Service type: Immunization administration / immunization status reporting
Typical site of service: Outpatient clinics, physician offices, pharmacies, community vaccination sites, and other ambulatory care settings

Data not available in the input.

Clinical Context

A 68-year-old patient presents to a primary care clinic during influenza season to receive an inactivated influenza vaccine. The patient has chronic obstructive pulmonary disease and diabetes mellitus, and the nurse verifies immunization history, documents informed consent, screens for contraindications (e.g., severe allergic reaction to prior influenza vaccine or egg allergy per current guidance), and administers the vaccine intramuscularly in the deltoid. The clinician documents date of administration, vaccine type/manufacturer, lot number, CVX code, route, site, and any adverse reaction observed. The encounter may occur at a physician office, community clinic, retail pharmacy, or long-term care facility; billing uses HCPCS Level II code G8482 to indicate influenza immunization administered at the encounter or previously received (for reporting immunization status). Typical workflow steps include registration and insurance eligibility check, clinical screening, vaccine administration by a licensed vaccinator, documentation and reporting to the immunization registry as required, and billing for the visit and vaccine using the appropriate codes and modifiers when applicable.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work required to provide the vaccine or related counseling is substantially greater than usual (rare for single vaccine administration).

Taxonomy Code	Specialty	Notes
`207Q00000X`	Family Medicine	Most common setting for adult influenza immunization administration.
`207R00000X`	Internal Medicine	Primary care internal medicine physicians frequently administer vaccines.
`363A00000X`	Public Health and General Preventive Medicine	Community clinic and public health departments provide mass influenza immunization.
`364S00000X`	Nurse Practitioner	Nurse practitioners in outpatient and community settings commonly administer vaccines.
`363L00000X`	Registered Nurse	Registered nurses perform screening and administration in clinics and pharmacies.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z23`	Encounter for immunization	Primary diagnosis code used to indicate administration of a vaccine, including influenza.
`J44.9`	Chronic obstructive pulmonary disease, unspecified	Common comorbidity that increases priority for influenza vaccination.
`E11.9`	Type 2 diabetes mellitus without complications	Chronic condition associated with higher influenza complication risk; prompts vaccination.
`Z91.01`	Allergy to eggs	Relevant to screening for influenza vaccine contraindication or precaution depending on vaccine type.
`Z98.890`	History of prior immunotherapy, other	Documentation of prior immunizations or relevant immunologic history when reporting immunization status.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`90460`	Immunization administration through 18 years of age via any route, first vaccine/toxoid component; includes counseling when performed	If the patient is a child, this code captures vaccine administration with counseling; for adults, not applicable.
`90461`	Immunization administration through 18 years of age, each additional vaccine/toxoid component	Additional components when multiple pediatric vaccines are given at the same visit.
`90471`	Immunization administration (single vaccine) for person 3 years or older, intramuscular or subcutaneous	Commonly used for adult influenza vaccine administration when billing CPT rather than HCPCS.
`90472`	Each additional vaccine (same visit)	Used when more than one vaccine is administered in the same encounter for patients 3 years or older.
`99213`	Office or other outpatient visit for the evaluation and management of an established patient, typically 15 minutes	Used when a significant E/M visit is performed at the same encounter as vaccine administration and documentation supports separate E/M billing.

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Summary & Overview

HCPCS G8482: Influenza Immunization Administered or Previously Received