Summary & Overview
HCPCS C9057: Injection, Cetirizine Hydrochloride 1 mg
HCPCS Level II code C9057 denotes an injectable formulation of cetirizine hydrochloride, 1 mg. As an HCPCS Level II code for a specific drug administration, it identifies billing for the medication itself when administered by a clinician rather than for the administration service alone. Nationally, drug-specific HCPCS codes matter for accurate drug reimbursement, inventory tracking, and formulary management across payers and care settings.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield plans, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn how C9057 is positioned in billing workflows, the clinical context for injectable cetirizine as an antihistamine option, and what benchmarks and policy considerations typically apply to HCPCS drug codes: reimbursement categorization, site-of-service implications, and payer coverage patterns. The publication summarizes available benchmarks where provided, highlights policy or coding updates affecting drug-specific HCPCS codes, and outlines operational considerations for facilities and billing departments handling injectable pharmaceuticals.
Data not available in the input for modifiers, associated taxonomies, ICD-10 diagnoses, related codes, and detailed service line breakdowns.
Billing Code Overview
HCPCS Level II code C9057 represents injection, cetirizine hydrochloride, 1 mg. This code describes a pharmaceutical injectable formulation of cetirizine hydrochloride at a 1 mg dose.
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Service type: Drug administration (injectable antihistamine)
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Typical site of service: Ambulatory clinics, outpatient infusion centers, emergency departments, and other facility settings where injectable medications are administered
Data not available in the input for modifiers, associated taxonomies, ICD-10 diagnoses, related codes, and service line.
Clinical & Coding Specifications
Clinical Context
A 45-year-old patient with a history of chronic allergic rhinitis and intermittent urticaria presents to an outpatient infusion clinic for administration of a prescribed intramuscular or subcutaneous injection of cetirizine hydrochloride, dosed per physician order as 1 mg per injection (HCPCS level II code C9057). The typical workflow begins with nurse triage and verification of allergy history and vital signs, confirmation of the medication order in the electronic health record, and assessment for contraindications such as known hypersensitivity to cetirizine or relevant excipients. The nurse performs standard medication reconciliation and explains the procedure and potential adverse reactions to the patient. After hand hygiene and appropriate site selection (commonly deltoid or anterolateral thigh for intramuscular injections; upper outer arm or thighs for subcutaneous injections), the nurse prepares the syringe, verifies dose using two patient identifiers, and administers the injection. Post‑administration monitoring for 15–30 minutes for immediate hypersensitivity or injection‑site reactions is typical. Documentation includes the medication name and dose (cetirizine hydrochloride 1 mg), lot number, route, site, time, administering clinician, and any immediate adverse events. Billing uses C9057 to report the single unit injection of cetirizine hydrochloride; additional services such as observation, evaluation, or separate procedural services may require reporting with appropriate CPT or HCPCS modifiers as clinically indicated.
Coding Specifications
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