Summary & Overview
HCPCS G0919: Influenza Immunization Ordered or Recommended
HCPCS Level II code G0919 documents that an influenza vaccine was ordered or recommended but could not be administered because the vaccine was not available at the time of the visit. Nationally, accurate use of this code matters for tracking preventive care delivery, vaccination outreach, and ensuring continuity of immunization efforts when patients must be referred to alternate providers or sites. Proper coding supports public health monitoring and payer recordkeeping of vaccine intent when administration is deferred.
This analysis covers major national payers including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a clear description of the code's clinical context, typical settings where it is used, and the administrative purpose it serves. The publication summarizes benchmarks and payer coverage patterns where available, highlights recent policy updates affecting documentation and billing for deferred vaccinations, and provides guidance on billing workflow implications and reporting considerations. Where detailed payer-specific coverage or modifier guidance is not provided, the report notes that data is not available in the input. The content is written for clinicians, billing professionals, and policy analysts seeking a concise national overview of HCPCS Level II code G0919 and its role in influenza immunization processes.
Billing Code Overview
HCPCS Level II code G0919 indicates an influenza immunization ordered or recommended (to be given at alternate location or alternate provider); vaccine not available at time of visit. This reflects a clinical encounter in which a provider documents that an influenza vaccine was ordered or recommended for the patient but the vaccine could not be administered during that visit because it was not available on site.
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Service type: Influenza immunization ordering/recommendation (administration deferred)
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Typical site of service: Ambulatory clinic, primary care office, urgent care, or any outpatient setting where the vaccine was not available at the time of the visit
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A patient presents to a primary care clinic during influenza season requesting routine preventive care. The clinician reviews immunization history and determines that influenza vaccination is indicated and documents informed consent. At the time of visit the clinic does not have the requested influenza vaccine in stock (supply chain limitation or cold‑chain issue), or the patient prefers to receive the vaccine at an alternate location (pharmacy, public health clinic) or from an alternate provider. The clinician documents the vaccine was ordered or recommended to be administered at an alternate location or by an alternate provider, including the vaccine formulation, indication, and recommended timeframe. The office records the recommendation in the medical record and may provide the patient with documentation or an order to present to the administering site. Billing uses HCPCS code G0919 to report that the influenza immunization was ordered or recommended but not administered at the visit because the vaccine was not available at the time of service. Typical workflow includes: review of immunization status, clinical decision and counseling, documentation of order/recommendation, communication or referral to the administering site, and follow‑up to confirm vaccination status for the patient’s chart.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service by the same physician on the same day of the procedure |