HCPCS

# A4239 HCPCS Code: Insulin Delivery Supplies Billing Guide

- April 24, 2025
- Posted by Brian Bertrand

24 Apr

The healthcare billing system is quite complicated, even in relation to certain specific HCPCS codes such as the HCPCS A4239. It compiles all the necessary information that providers, payers, and patients will have to know about this critical code for the reimbursement of CGM supplies for diabetes. Today these terms can explicitly be found on many of the sources that range from official, to educational, through to application level.

## What are HCPCS Codes?

HCPCS or the Healthcare Common Procedure Coding System is the standard followed by healthcare providers, healthcare end users, payers, and government agencies to identify services, products, or the supply used in patient care delivery. It is managed by the Centers for Medicare & Medicaid Services – CMS, and HCPCS has two different levels.

- Level I, the modifiers used with the Current Procedural Terminology (CPT®) codes for medical services and procedures should be written down.

- HCPCS Level II in which HCPCS code A4239 is located is for non-physician services and products which includes medical equipment, prosthetics, orthotics and supplies or DMEPOS.

## A4239 HCPCS Code

A4239 HCPCS Code is defined as:

“Supply allowance for therapeutic diabetic continuous glucose monitor (CGM) and its accessories – unit of service includes the consumables and accessories, and one unit of service is one month strip.”

This code was adopted to meet the supply requirement of patients using therapeutic CGM systems. The CGM systems monitor human blood glucose concentrations in real-time and are helpful to a lot of diabetic patients.

Before passage of A4239, there was confusion as to who was responsible for billing for the CGM supplies. It is clear to us all that grouping all the necessary parts in terms of a one-month account makes it easier for reimbursement for the providers.

## Table: Key Information about A4239

Code | Description | Unit | Effective Date | Billing Frequency
A4239 | Supply allowance for therapeutic CGM (includes all supplies for 1 month) | 1 month of supply | April 2022 | Monthly

## Historical Background and Changes over Time

A new generation of CGM technology helps diabetes patients in many ways. At the beginning, the HCPCS Codes existed as distinct sets for sensors, transmitters, and receivers. However, charges of the clinical services came in a rather discrete manner, and there was much experience with denied claims.

It is imperative to combine these supplies under a single code, and therefore, CMS has developed code A4239 for the same. This code represents a significant improvement in the decrease of time and bureaucracy on billing issues for the therapeutic CGM systems, thus allowing for continuity of care for the patient and removing barriers for the providers.

This formation of A4239, therefore, stands in line with developing medical technology. This is because, as CGMs become more integrated into the management of diabetes, facilities have to gear up for new kinds of delivery, paving the way for billing problems to be addressed all the more as well.

## Detailed Description of A4239

### Official Description and Classification

A4239 HCPCS Code specifically refers to supply allowances for CGM systems that are therapeutically necessary and designed for the management of diabetes without the use of a BG meter, such as Dexcom G6 and Abbott Freestyle Libre 2.

### What’s Included Under A4239:

- Sensors
- Transmitters
- Adhesive patches
- Insertion tools
- Calibration kits (if applicable)
- Any required accessory for CGM functionality

This code does not include the CGM receiver or smartphone or the insertion/education service that is taught by our specialists when inserting the CGM and charging under a separate code.

This way of bundling makes every procedure billed on a monthly basis, which therefore increases reimbursement output and facilitates patients’ access to continuous care.

## Usage Scenarios for A4239

Thus, HCPCS A4239 applies to a patient who has a therapeutic CGM prescribed by his doctor and is used by the patient daily for insulin therapy. The supplies are crucial in monitoring the glucose levels and decision-making for insulin administration.

### Example Use Cases:

- A patient with Type 1 diabetes is an end-user of a CGM device to prevent hypoglycemic events.
- A seventy-year-old patient with T2DM on intensive insulin treatment should use CGM regularly.
- A pediatric patient given insulin by the insulin pump requires monitoring of glucose to manage his/her insulin dosage.

In all of these circumstances, providers will use A4239 to submit a separate requisition for the monitoring amount for a monthly supply allowance.

## Reimbursement Guidelines

### Medicare and Medicaid Policies

The coverage of CGMs through Medicare, including the supplies stated under A4239, has changed over the recent past. In particular, since 1 January 2023, CMS classifies CGMs as Durable Medical Equipment when the following conditions are fulfilled

1. Consequently, a patient must have diabetes and need insulin treatment.
2. Frequency: The use of Blood Glucose Measurement is frequent (four or more tests per day).
3. CGM Use: Must have a proper prescription and clinical notes to support the use of the CGM devices.

In this way, Medicare reimburses A4239 every month while ensuring there are adequate supplies in the clinic so the patient may be given a convenient supply often.

Medical Necessity Tip: CGM must have continuing documentation of medical necessity for its use when billing it to the insurance. It also shows that any eventualities that affect the data can have the impact of delaying or even denying the claims.

### Private Insurance and Billing Considerations

Private insurers often align their policies with CMS guidelines, but coverage varies by plan. As for the codes A4239, most major insurers consider them as durable medical equipment or pharmacy supplies, and so they are paid for or reimbursed for CGM supplies.

#### Provider Tips for Private Billing:

- Verify benefits before submitting claims.
- Use prior authorizations where necessary.
- Eliminate competitive relation distinctions, establishing A4239 as a selling group for all monthly supply needs.

Coding and documentation must follow certain rules, and accurate code implementation is necessary to avoid auditing or denial. It is important for the providers to remain relevant with the rules of each payer, for these could change yearly.

## A4239 Code in Clinical Practice

### Common Providers and Settings

The following group of people more often utilizes this code:

- Endocrinologists managing insulin-dependent diabetes.
- Primary care physicians in long-term diabetes management.
- Some of the product categories are DME suppliers who distribute monthly CGM kits.
- Home health agencies dealing with chronic diabetes clientele.

It is done at outpatient departments, private practices, and home health agencies. This makes it possible for A4239 to be suitable for subscription-driven supply services since they are billed on a monthly basis.

### Workflow Integration:

RPM services are employed by many providers who integrate CGM data into the clients’ management plans. The supplied A4239 enables precautions when the glucose level reaches such thresholds by providing real-time alarms.

## Real-world Case Applications

### Case Study: Elderly Patient with Type 2 Diabetes

Mr. L is a 72-year-old insulin-requiring client diagnosed with Type 2 diabetes. They recently spent two hospitalizations because of hypoglycemia. Her endocrinologist prescribes a CGM system. In other words, the clinic codes A4239 monthly for all the required CGM supplies in the procedure. In three months, she has improved glucose variability, and she does not end up in the ER frequently.

### Case Study: Pediatric Diabetes Management

The subject of the study is a ten-year-old boy, named Jake, who needs an insulin pump together with a CGM. His pediatric endocrinologist employs A4239 for sensors as well as accessories. It also helps with school performance and reduces sick days, which are a result of consistent and stable blood glucose levels.

### Conclusion

HCPCS code A4239 could not be overestimated in today’s diabetes management, as it simplifies the billing and reimbursement evaluation of therapeutic CGM’s accessories. It was a breakthrough in the transformation of a patient care situation insofar as guaranteeing a steady provision of the means that patients require to maintain their glucose levels. Regardless of whether one is a provider intending to manage claims or a patient who wants to understand what the insurance covers, there is nothing as vital as understanding this code.

A4239’s monthly supply provision is made easier when there is documentation and clear billing procedures, hence enhancing better results in diabetes. With CGM technology becoming an integral part of modern chronic disease management, the use of codes such as A4239 will always be relevant in closing the technology’s gap in delivering that innovation in the healthcare sector.

## Frequently Asked Questions

### What exactly does HCPCS code A4239 cover?

A4239 encompasses all the products required for a therapeutic CGM system within one month. This includes the sensors, transmitters, the tool to be inserted into the circuit, and any other related accessories.

### Can A4239 be used for non-therapeutic continuous glucose monitoring devices?

No, A4239 is solely related to therapeutic CGMs, which are the devices cleared by the FDA to suggest diabetes management decisions without further confirmation with blood glucose meters.

### Is A4239 reimbursed by Medicare?

Indeed, the code A4239 can be reimbursed under Medicare if the patient meets some conditions, such as insulin usage together with frequent self-glucose monitoring. Proper documentation must be provided.

### How often can A4239 be billed?

A4239 should be billed once a month since it covers CGM-related items that are supplied in a single month.

### Does A4239 cover the CGM device itself?

It does not cover the receiver or the smartphone that enables one to view glucose readings. As for supplies, A4239 would only include items for the operation of CGM, such as supplies and accessories.

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