HCPCS Level II A4305: Disposable Drug Delivery System, ≥50 ml/hr - OpenPayer

Summary & Overview

HCPCS Level II A4305: Disposable Drug Delivery System, ≥50 ml/hr

HCPCS Level II code A4305 identifies a disposable drug delivery system capable of delivering fluids at a flow rate of 50 ml or greater per hour. These devices are used to administer medications and large-volume infusions across inpatient, outpatient, ambulatory infusion, and home infusion settings. Nationally, this code matters because it standardizes billing for higher flow-rate disposable pumps that support chemotherapy, hydration, antibiotic infusions, and other therapies requiring sustained, higher-volume delivery.

Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical context for use of A4305, typical sites of service, and the operational billing elements tied to this equipment classification. The publication summarizes payer coverage patterns, common modifier usage, and where relevant policy updates may affect claims processing. It also outlines benchmarks and common billing considerations for infusion device supply lines.

This summary equips providers, billing professionals, and policy analysts with a practical reference to the purpose and billing context of HCPCS Level II code A4305 for national audiences.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareA4305HCPCS Level IIinfusion pumpsdurable medical equipmenthome infusiondrug delivery systeminfusion therapymedical billing

Billing Code Overview

HCPCS Level II code A4305 denotes a disposable drug delivery system with a flow rate of 50 ml or greater per hour. This code represents single-use infusion or pump devices designed to deliver medications or fluids at relatively high continuous flow rates.

Service type: Durable medical equipment/drug delivery device supplied for infusion therapy
Typical site of service: Hospital inpatient, hospital outpatient, ambulatory infusion centers, and home infusion settings where higher flow-rate disposable pumps are required

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult receiving continuous intravenous infusion of medications or fluids at high flow rates in an acute or post-acute setting. For example, a hospitalized patient with septic shock requires broad-spectrum vasopressors and large-volume fluid resuscitation through an infusion pump capable of delivering at least 50 mL/hour. The disposable drug delivery system coded as A4305 is used when a single-use infusion set or pump accessory with a flow rate of 50 mL or greater per hour is attached to an infusion pump for administration of IV antibiotics, vasoactive agents, parenteral nutrition, or continuous analgesia.

Clinical workflow: the admitting team orders continuous IV therapy. A registered nurse or infusion therapist selects the appropriate disposable drug delivery system A4305, primes the tubing, programs the infusion pump, and documents device lot number, start time, medication, rate, and site of administration. The device is replaced per facility policy, after contamination, or when therapy is completed. Billing staff assign A4305 for the disposable drug delivery system when the device meets the flow-rate specification and is furnished to the patient during the encounter.

Coding Specifications

Modifier	Description	When to Use
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Related Codes

HCPCS-A4580-CAST-SUPPLIES-PLASTER

HCPCS Level II A4580: Cast Supplies (Plaster)

HCPCS-A4342-INTRAURETHRAL-DRAINAGE-ACCESSORY-VALVE-REPLACEMENT

HCPCS A4342: Intraurethral Drainage Accessory with Valve, Replacement Only

HCPCS-A4671-DISPOSABLE-CYCLER-SET-DIALYSIS

HCPCS A4671: Disposable Cycler Set for Dialysis

HCPCS-A6245-HYDROGEL-WOUND-DRESSING-16-SQ-IN-OR-LESS

HCPCS A6245: Hydrogel Wound Dressing, Sterile, ≤16 sq. in.

HCPCS-A6507-COMPRESSION-BURN-GARMENT-FOOT-TO-KNEE-CUSTOM

HCPCS A6507: Foot-to-Knee Custom Compression Burn Garment

HCPCS-A4554-DISPOSABLE-UNDERPADS

HCPCS Level II A4554: Disposable Underpads, All Sizes

HCPCS-A4628-ORAL-OROPHARYNGEAL-SUCTION-CATHETER

HCPCS A4628: Oral and Oropharyngeal Suction Catheter

HCPCS-A6451-MODERATE-COMPRESSION-ELASTIC-BANDAGE-PER-YARD

HCPCS A6451: Moderate Compression Elastic Bandage, per yard

HCPCS-A6607-GRADIENT-COMPRESSION-TUBULAR-ABSORPTION-LAYER

HCPCS A6607: Gradient Compression Tubular Protective Absorption Layer

HCPCS-A5501-CUSTOM-MOLDED-DIABETIC-SHOE

HCPCS A5501: Custom Molded Therapeutic Shoe for Diabetes

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Taxonomy Code	Specialty	Notes
`338N00000X`	Critical Care Medicine	Manages patients who commonly require high-rate continuous infusion devices.
`207P00000X`	Interventional Cardiology	Places central venous or arterial access needed for infusion in some acute cardiac patients.
`208D00000X`	Emergency Medicine	Initiates high-flow infusion devices in emergency settings.
`163W00000X`	Vascular Surgery	Performs complex vascular access procedures that enable high-flow infusions.
`371K00000X`	Anesthesiology	Provides anesthesia care and vascular access in perioperative settings requiring infusion therapy.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`A41.9`	Sepsis, unspecified organism	Patients with sepsis often require high-rate fluid resuscitation and continuous vasopressor infusions delivered via high-flow disposable systems.
`I95.9`	Hypotension, unspecified	Persistent hypotension may prompt continuous vasopressor infusion at rates requiring `A4305` delivery systems.
`R65.21`	Severe sepsis with septic shock	Severe sepsis with shock commonly necessitates large-volume resuscitation and continuous medication infusions.
`Z45.2`	Encounter for adjustment and management of vascular access device	Follow-up encounters involving management or replacement of infusion delivery systems.
`T82.89XA`	Other complications of cardiac and vascular prosthetic devices, implants and grafts, initial encounter	Applicable when complications of access devices require replacement of disposable infusion components.
`E86.0`	Dehydration	Patients with significant dehydration may receive high-rate IV fluid therapy using `A4305` devices.
`K72.90`	Hepatic failure, unspecified without coma	Critically ill patients with hepatic failure may require continuous infusion support, including parenteral nutrition delivered via high-flow systems.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`36415`	Collection of venous blood by venipuncture	Peripheral IV access may be preceded by blood draws for baseline labs before high-rate infusion therapy.
`36410`	Therapeutic, prophylactic, or diagnostic injection (eg, IV push), single or initial substance/drug	Single IV medication boluses often accompany initiation of continuous infusion therapy; peripheral access may be used.
`36556`	Insertion of non-tunneled centrally inserted central venous catheter; age 5 years or older	Central venous access is commonly placed when high-flow continuous infusions are required and peripheral access is inadequate.
`36561`	Insertion of tunneled centrally inserted central venous catheter, with subcutaneous port or pump, for long-term infusion	Used when long-term continuous high-rate infusion requires a tunneled catheter and port system.
`96521`	Refilling and maintenance of portable infusion pump containing antineoplastic/infusion drug	Related to maintenance or refilling of infusion pumps used with disposable delivery systems like `A4305`.
`99231`	Subsequent hospital care, per day, for evaluation and management	Daily evaluation and management codes are used to document ongoing inpatient care of patients receiving continuous infusion therapy.