Summary & Overview
HCPCS J1644: Heparin Sodium Injection, per 1000 Units
HCPCS Level II code J1644 denotes injection of heparin sodium, billed per 1000 units. As a commonly used parenteral anticoagulant, heparin is central to inpatient and outpatient management of thromboembolic conditions and procedural anticoagulation protocols. Accurate coding for J1644 matters nationally because it affects drug utilization reporting, clinical documentation for anticoagulation therapy, and claims adjudication for hospitals, outpatient facilities, and professional providers.
Key payers considered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise review of what J1644 represents clinically and operationally, payer coverage patterns and common billing practices, benchmarks for utilization and unit reporting, and relevant policy or claim edits that influence reimbursement and claims processing. The publication also outlines typical sites of service where J1644 is used and practical considerations for aligning drug units with clinical dosing.
Data not available in the input is noted where specific fields (associated taxonomies, ICD-10 pairings, or related codes) were not provided.
Billing Code Overview
HCPCS Level II code J1644 describes Injection, heparin sodium, per 1000 units. This code represents administration of unfractionated heparin measured in 1000-unit increments and is used to report the drug product itself when billed under a professional or facility claim.
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Service type: Parenteral anticoagulant medication administration (drug supply)
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Typical site of service: Hospital inpatient, hospital outpatient, emergency department, ambulatory surgery centers, and other settings where injectable anticoagulant therapy is provided
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Clinical & Coding Specifications
Clinical Context
A typical patient is an adult receiving anticoagulation management in an outpatient infusion clinic, emergency department, or inpatient ward who requires therapeutic or prophylactic heparin administration. For example, a 68-year-old patient with acute deep vein thrombosis presents to the emergency department with unilateral leg swelling and positive ultrasound; the treating physician orders an initial bolus and subsequent subcutaneous or intravenous heparin infusions. Nursing documents the medication as J1644 billed per 1000 units, records dose, route (intravenous push, continuous IV infusion, or subcutaneous), and monitors activated partial thromboplastin time (aPTT) or anti-Xa levels. Typical workflow: physician order → medication preparation by pharmacy or nurse (dose calculated by weight) → administration (bolus and/or infusion or scheduled subcutaneous injections) → monitoring labs and vital signs → documentation and billing of units administered using J1644 per 1000 units with appropriate modifiers for setting or circumstances.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
JW | Drug wastage discarded | When billing requires reporting of discarded portion of multi-dose vial per payer rules |