Summary & Overview
HCPCS Level II A4239: Supply Allowance for Non‑implanted Non‑adjunctive CGM
Headline: HCPCS Level II code A4239 covers monthly supplies for non‑implanted, non‑adjunctive continuous glucose monitors
Lead: HCPCS Level II code A4239 designates a monthly supply allowance for non‑adjunctive, non‑implanted continuous glucose monitors (CGMs), encompassing all related supplies and accessories. The code is used by durable medical equipment suppliers and payer programs to bill one unit per month of supplies for devices intended to support ongoing glucose monitoring.
What the code represents and national significance: The code defines a standardized supply billing unit for a class of CGM products that operate without adjunctive requirements or implantation. Nationally, consistent use of this HCPCS code supports clearer claims processing, supply management, and benefit categorization for diabetes monitoring technologies.
Key payers covered: This overview references major national commercial payers: Aetna, Blue Cross Blue Shield, Cigna Health, and UnitedHealthcare.
What readers will learn: The publication provides benchmarks and policy context for billing under HCPCS Level II code A4239, explains clinical and billing boundaries between device and supply codes, and outlines typical places of service and reporting conventions. It highlights associations with durable medical equipment supplier billing practices and clarifies the unit-of-service definition (1 month = 1 unit).
Data gaps: Data not available in the input for specific payer coverage policies, reimbursement rates, and service-line level details.
Billing Code Overview
HCPCS Level II code A4239 describes a supply allowance for non‑adjunctive, non‑implanted continuous glucose monitor (CGM). The code covers all supplies and accessories associated with the device and is billed in units where 1 month supply = 1 unit of service.
Service Type: Durable Medical Equipment (supplies)
Typical Site of Service: DME Supplier (POS 32)
Clinical & Coding Specifications
Clinical Context
A patient with insulin-treated diabetes presents to a Durable Medical Equipment supplier for monthly supplies for a non‑adjunctive, non‑implanted continuous glucose monitor (CGM). The clinician documents ongoing need for CGM supplies due to impaired glucose monitoring or frequent hypoglycemia, and submits an order specifying a one‑month supply quantity. The DME supplier processes the order, bills for the supply allowance as HCPCS Level II code A4239 with the appropriate modifier (NU for new equipment on initial supply or RR if billed as a rental), and coordinates shipment to the patient for home use. Follow up visits with the ordering provider confirm continued medical necessity and adjust supply frequency as clinically indicated.
Coding Specifications
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Modifier
NU: New Equipment — used when the item is provided as new initial equipment. -
Modifier
RR: Rental — used when the supplier is billing the item as a rental rather than purchase.
Associated Provider Taxonomies
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207RE0101X: Endocrinology, Diabetes & Metabolism Physician — specialty managing diabetes care and CGM therapy. -
207Q00000X: Family Medicine Physician — primary care physicians who may order CGM supplies for patients with diabetes.