Summary & Overview
HCPCS A4222: Infusion Supplies for External Pump Cassette or Bag
HCPCS Level II code A4222 represents infusion supplies used with an external drug infusion pump, billed per cassette or bag. This code captures the consumable components tied to pump-based infusion delivery rather than the drug itself, and is relevant to clinicians, home infusion providers, ambulatory infusion centers, and payers managing pharmacy and durable medical equipment (DME) benefits. Nationally, clear coding for pump supplies affects coverage determinations, utilization tracking, and claims processing for infusion therapy across care sites.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of typical use cases and sites of service, common modifiers, and the role of supply codes in claims for external infusion pump therapies. The publication outlines benchmarks and payment context where available, summarizes policy considerations that commonly affect supply code adjudication, and provides clinical context for when supplies are billed per cassette or bag versus per dose or unit of drug.
The analysis is intended to help billing managers, revenue cycle professionals, and clinical program administrators understand where A4222 fits in the billing workflow, what to expect on claim lines for pump-based infusion, and which stakeholders typically review these supply charges. Data not available in the input will be noted where applicable.
Billing Code Overview
HCPCS Level II code A4222 describes infusion supplies for an external drug infusion pump, billed per cassette or bag. The code is used to report the disposable supplies associated with delivering an infusion therapy product that is administered via an external infusion pump.
Service Type: Infusion supply for infusion pump cassette or bag
Typical Site of Service: Home infusion, outpatient infusion center, ambulatory infusion clinic, or other outpatient settings where external infusion pumps are used
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult receiving outpatient continuous or intermittent infusion therapy at home or in an ambulatory infusion center for conditions such as severe infection requiring prolonged IV antibiotics, chronic pain requiring patient-controlled analgesia, or chemotherapy delivered via ambulatory pump. A durable medical equipment provider or infusion pharmacy dispenses an external infusion pump and supplies a cassette or bag containing the drug; A4222 is billed per cassette or bag for infusion supplies associated with that external pump. Clinical workflow: physician orders infusion therapy with specified drug and regimen; infusion pharmacy prepares the dose in a cassette or bag labeled with the drug; nursing or trained caregiver delivers and connects the cassette/bag to the patient’s external pump on scheduled days; documentation includes drug name, lot, cassette/bag count, start and stop times, and patient tolerance. Typical site of service: home health/home infusion, ambulatory infusion center, or outpatient infusion suite. The service is billed by the supplying entity per cassette or bag, with each drug listed separately when multiple drugs are provided.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
59 | Data not available in the input. | Data not available in the input. |