Summary & Overview
HCPCS G2163: Influenza Vaccine Received During Seasonal Measurement Window
HCPCS Level II code G2163 documents that a patient received an influenza vaccine during the seasonal measurement window—from July 1 of the year before the measurement period through June 30 of the measurement period. This designation is used primarily for immunization reporting and quality measurement tied to seasonal flu prevention efforts. Nationally, accurate capture of influenza vaccination events affects public health monitoring, payer quality measures, and performance reporting for preventive care programs.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of how the code maps to seasonal vaccination reporting, the typical service settings where the code is used (ambulatory clinics, physician offices, pharmacies), and which payers accept or track this HCPCS code for quality measures. The publication also outlines related benchmarks and policy context relevant to seasonal influenza immunization capture, and notes where input data is not available. This summary is intended for national audiences involved in medical billing, quality measurement, and immunization program management.
Billing Code Overview
HCPCS Level II code G2163 indicates that a patient received an influenza vaccine on or between July 1 of the year prior to the measurement period and June 30 of the measurement period. This code documents administration within the specified seasonal measurement window.
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Service type: Influenza vaccination administration as part of seasonal immunization reporting
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Typical site of service: Ambulatory settings including physician offices, clinics, pharmacies, and other outpatient sites where routine immunizations are provided
Clinical & Coding Specifications
Clinical Context
A 72-year-old patient arrives at a primary care clinic during an annual visit in October. The clinician reviews the patient’s preventive care needs and documents that the patient has not yet received an influenza vaccine for the current season. The nurse verifies immunization history, confirms there are no contraindications (eg, severe egg allergy or history of Guillain-Barré syndrome related to previous influenza vaccine), and administers the appropriate influenza vaccine. The clinic documents administration date and vaccine lot number in the medical record and in the state immunization registry. For quality measurement and reporting, this encounter qualifies when the influenza vaccine was administered on or between July 1 of the year prior to the measurement period and June 30 of the measurement period, consistent with measure timing. Typical workflow steps include pre-visit medication and allergy review, vaccine consent and education, vaccine administration by nursing staff, documentation of vaccine type/lot/site, and billing using the influenza vaccine HCPCS Level II code G2163 for reporting the measure-defined administration window.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Rarely used for vaccine administration; only if substantial additional work beyond typical vaccine administration is documented |