Summary & Overview
HCPCS C9456: Isavuconazonium Sulfate Injection, 1 mg
HCPCS Level II code C9456 denotes administration of isavuconazonium sulfate, 1 mg — a parenteral antifungal agent used for systemic fungal infections. This code is important nationally for accurate billing of intravenous antifungal therapy delivered in outpatient infusion centers, hospital outpatient departments, and clinic settings. Precise coding affects clinical documentation, payer adjudication, and aggregate spending on high-cost antifungal medications.
Key payers in this review include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical context, common sites of service, and how payers typically classify and reimburse parenteral antifungal drugs. The publication also summarizes benchmarking metrics where available, notes common billing considerations, and highlights recent policy updates relevant to infusion and outpatient drug administration.
This piece is designed for coding professionals, revenue cycle managers, pharmacists, and clinicians who need a national-level practical reference for documenting and billing C9456. Data not available in the input is clearly indicated where applicable.
Billing Code Overview
HCPCS Level II code C9456 represents an injection of isavuconazonium sulfate, 1 mg. The service involves administration of an antifungal prodrug used in systemic antifungal therapy.
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Service type: Parenteral antifungal medication administration
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Typical site of service: Outpatient infusion center, hospital outpatient department, or clinic-based injectable therapy setting
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Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with invasive fungal infection such as invasive aspergillosis or mucormycosis who requires systemic antifungal therapy. The patient often presents to an inpatient infectious disease service or to an ambulatory infusion center after hospital discharge for continued intravenous therapy. A clinician (infectious disease physician or hospitalist) documents the indication, dosage, and route; a pharmacist compounds the intravenous formulation; and a registered nurse administers the medication via peripheral IV or central venous access. Billing uses the HCPCS Level II code C9456 to report administration of isavuconazonium sulfate measured per milligram. Common workflow steps include medication order entry, pharmacy preparation and compounding of the labeled dose, verification of dose and concentration, nursing administration with monitoring for infusion reactions, and documentation of dose administered in the medical record. Typical sites of service are acute inpatient hospital, hospital outpatient infusion center, and skilled nursing facility when parenteral therapy is required after discharge.
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 | Use when a distinct E/M visit is provided the same day as administration and meets E/M documentation criteria |