Summary & Overview
HCPCS Level II A4230: Infusion Set for External Insulin Pump, Non-Needle Cannula
HCPCS Level II code A4230 identifies a non-needle cannula infusion set used with external insulin pumps, a common supply in ambulatory diabetes management. Nationally, this code matters because it represents a recurring supply line for patients on continuous subcutaneous insulin infusion, affecting procurement, coverage policy, and supply-chain considerations across payers and suppliers. Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, and UnitedHealthcare. Readers will gain a concise understanding of the code’s clinical role and billing context, payer coverage landscape, and how A4230 relates to other insulin pump supplies. The publication provides: benchmarks for supply categorization and typical sites of service; clarification of the code’s place within durable medical equipment supply billing; and a clinical context that links the item to ongoing insulin therapy. Absent state-specific policy detail, the discussion is framed for a national audience. Where input information is incomplete, the report notes "Data not available in the input." The content avoids clinical recommendations and focuses on factual description, payer inclusion, and coding relationships to help coding, billing, and policy stakeholders interpret A4230 in routine DMEPOS supply workflows.
Billing Code Overview
HCPCS Level II code A4230 describes an infusion set for an external insulin pump, non-needle cannula type. This item is classified as Durable Medical Equipment (Supply) and is typically provided through a durable medical equipment supplier (DMEPOS).
Clinical & Coding Specifications
Clinical Context
A 32-year-old patient with type 1 diabetes mellitus presents for outpatient durable medical equipment supply services to receive infusion sets for their external insulin pump. The patient is established on continuous subcutaneous insulin infusion and requires routine replacement of the infusion set (non-needle cannula type) every 2–3 days or per manufacturer guidance. The clinical workflow includes verification of medical necessity by an Endocrinology or Primary Care clinician, selection of the appropriate infusion set, documentation of the prescription and quantity, and dispensing from a durable medical equipment supplier (DMEPOS). Billing uses HCPCS Level II code A4230 for the infusion set; common supply modifiers (e.g., NU, RR) are appended as applicable. Typical encounters include review of current insulin use (e.g., Z79.4), assessment of glycemic control, and patient education on insertion, site rotation, and troubleshooting of the external insulin pump infusion set.
Coding Specifications
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Modifiers:
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NU: Indicates New Equipment when the infusion set is provided as new to the patient. Use this modifier when initial issue of the DME supply is furnished. -
RR: Indicates Rental when the item is furnished as a rental. Use this modifier when the supplier is billing for rental of the equipment rather than purchase. -
Provider Taxonomies:
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207RE0101X— Endocrinology, Diabetes & Metabolism Physician: Specialty managing diabetes technology and insulin pump therapy. -
207Q00000X— Family Medicine Physician: Primary care clinicians who may prescribe and manage insulin pump supplies. -
207R00000X— Internal Medicine Physician: Internal medicine clinicians who may prescribe and manage insulin pump supplies. -
Service Type and Site:
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Service Type: Durable Medical Equipment (Supply)
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Typical Site of Service: Durable medical equipment supplier (DMEPOS)
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Notes:
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Use the correct code system name: this item is billed with HCPCS Level II code
A4230.
Related Diagnoses
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E10.9— Type 1 diabetes mellitus without complications- Clinical relevance: Indicates a patient with type 1 diabetes who requires continuous insulin delivery via an external insulin pump; supports medical necessity for infusion set supplies billed with HCPCS Level II code
A4230.
- Clinical relevance: Indicates a patient with type 1 diabetes who requires continuous insulin delivery via an external insulin pump; supports medical necessity for infusion set supplies billed with HCPCS Level II code
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E11.9— Type 2 diabetes mellitus without complications- Clinical relevance: Indicates type 2 diabetes where intensive insulin therapy with a pump may be used; can be a valid diagnosis when documenting need for infusion set supplies billed with HCPCS Level II code
A4230.
- Clinical relevance: Indicates type 2 diabetes where intensive insulin therapy with a pump may be used; can be a valid diagnosis when documenting need for infusion set supplies billed with HCPCS Level II code
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E10.65— Type 1 diabetes mellitus with hyperglycemia- Clinical relevance: Hyperglycemia in type 1 diabetes may necessitate optimization of insulin delivery systems, supporting use of external insulin pump infusion sets (
A4230).
- Clinical relevance: Hyperglycemia in type 1 diabetes may necessitate optimization of insulin delivery systems, supporting use of external insulin pump infusion sets (
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E11.65— Type 2 diabetes mellitus with hyperglycemia- Clinical relevance: Hyperglycemia in type 2 diabetes can lead to initiation or adjustment of insulin pump therapy, supporting supply of infusion sets billed with HCPCS Level II code
A4230.
- Clinical relevance: Hyperglycemia in type 2 diabetes can lead to initiation or adjustment of insulin pump therapy, supporting supply of infusion sets billed with HCPCS Level II code
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Z79.4— Long term (current) use of insulin- Clinical relevance: Documents chronic insulin therapy, supporting ongoing supply needs for external insulin pump infusion sets billed with HCPCS Level II code
A4230.
- Clinical relevance: Documents chronic insulin therapy, supporting ongoing supply needs for external insulin pump infusion sets billed with HCPCS Level II code
Related Codes
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A4224— Supplies for maintenance of insulin infusion catheter, per week (inclusive of cannulas, needles, dressings and infusion supplies)-
Clinical relation:
A4224covers the bundled weekly maintenance supplies for an insulin infusion catheter; it may be billed when a weekly kit of supplies is supplied instead of individual infusion set units. -
Usage: Commonly used as an alternative or in combination when the supplier provides a weekly maintenance package that includes cannulas and associated dressings rather than separately billing
A4230units.
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A4225— Supplies for external insulin infusion pump, syringe-type cartridge, sterile, each-
Clinical relation:
A4225describes supplies specific to syringe-type cartridge systems rather than non-needle cannula infusion sets; it is an alternative for patients using a different pump delivery mechanism. -
Usage: Used as an alternative when the patient’s pump system requires syringe-type cartridge supplies rather than the non-needle cannula type described by HCPCS Level II code
A4230.
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National Reimbursement Benchmarks
National mean rates for HCPCS Level II code A4230 show BUCA (average commercial) at $37.47 compared with Medicare at $0.00 based on the provided input. BUCA's mean is substantially higher than Medicare's reported value in the input, and other commercial payers vary widely around BUCA's level.
Rate dispersion measured as the difference between the 75th and 25th percentiles is tightest for Cigna Health (0.00) and Aetna (2.33), and widest for UnitedHealthcare (53.50) and Blue Cross Blue Shield (5.00). The table and chart below present the full breakdown of mean rates and percentile values for each payer.
Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.