Continuous Glucose Monitors (CGMs) - New Codes

New codes for continuous glucose monitors (CGMs) became effective on April 1, 2022. The following information is excerpted from MLN Matters MM12564 regarding CGMs. Be sure to review this information and implement policies to ensure accurate reporting/billing.

Continuous Glucose Monitors (CGMs)

On December 28, 2021, we published the Medicare DMEPOS final rule in the Federal Register. This addressed the classification and payment of adjunctive CGMs under the Medicare Part B benefit for DME.

This rule expanded the classification of DME to a larger group of non-implantable CGMs, regardless of whether the CGMs are non-adjunctive (can alert patients when glucose levels are approaching dangerous levels, including while they sleep, and also replace blood glucose monitors) or adjunctive (can alert patients when glucose levels may be approaching dangerous levels, including while they sleep, but don't replace blood glucose monitors), as long as the CGMs otherwise satisfy the regulatory definition of DME (durable equipment used in the home).

We aren't aware at this time of an adjunctive CGM stand-alone receiver, transmitter, and sensor system that meets the DME definition. However, adjunctive CGM supplies and accessories used in conjunction with an insulin pump that also does the functions of an adjunctive CGM could be classified and covered under the DME benefit in cases where the patient meets the Medicare coverage and medical necessity requirements for both an insulin pump and an adjunctive CGM.

Although the final rule classifies adjunctive CGMs as DME items, Section 1862(a)(1)(A) of the Act still prohibits Medicare payment for these items if they aren't determined reasonable and necessary for the treatment of the diabetes illness. Until a local or national coverage determination is established for these items, MACs will make coverage decisions regarding these items on a claim-by-claim basis.

Adjunctive CGM Supplies and Accessories for Each Month of Use

For dates of service February 28, 2022 - March 31, 2022, suppliers billing for adjunctive CGM supplies and accessories used in conjunction with an insulin pump that also do the functions of an adjunctive CGM should use:


Effective April 1, 2022, HCPCS codes A9276 and A9277 are invalid for Medicare use for billing individual CGM supplies and accessories and not reflective of a monthly allowance. Effective April 1, 2022, we added HCPCS code A4238 (Supply allowance for adjunctive continuous glucose monitor [CGM], includes all supplies and accessories, 1 month supply = 1 unit of service) to the HCPCS file to describe a month's supply of adjunctive CGM supplies and accessories.

Adjunctive CGM or Receiver for Each Month of Use

For dates of service February 28, 2022 - March 31, 2022, suppliers should use HCPCS code E1399 (Durable medical equipment, miscellaneous) to describe a CGM for this purpose until code E2102 is effective.

Effective April 1, 2022, HCPCS code A9278 is invalid for Medicare use for billing adjunctive CGM receivers.

Effective April 1, 2022, we added HCPCS code E2102 (Adjunctive Continuous Glucose Monitor or Receiver) to the HCPCS file to describe the use of an insulin pump with an integrated adjunctive CGM receiver function.

For dates of service on or after April 1, 2022, suppliers should bill using HCPCS modifier for a rental (RR), both codes, E0784 (External Ambulatory Infusion Pump, Insulin) and E2102, to describe the rental of an insulin pump with integrated adjunctive CGM receiver functionality.

Pricing for Continuous Glucose Monitors (CGMs)

Pricing for one month of adjunctive CGM supplies and accessories submitted under the HCPCS codes below, with payment based on local fee schedule amounts established by DME MACs.


Pricing for an adjunctive CGM monitor is based on local fee schedule amounts set by DME MACs as follows:


Payment for E2102 (or E1399 for dates of service between February 28, 2022 - March 31, 2022), is only available for the CGM receiver function of a rented insulin infusion pump if the patient doesn't already own a CGM receiver of any kind (either adjunctive or non-adjunctive) that is less than 5 years old, and the patient doesn't already own an insulin pump of any kind that is less than 5 years old.

In addition, switching from an insulin pump without the CGM receiver feature to an insulin pump with the CGM receiver feature doesn't result in either an interruption in the period of continuous use for the insulin pump or the start of a new 13-month rental cap period for the insulin pump for the patient. The supplier will transfer title of the equipment to the patient on the first day following the end of the 13th month of use by the patient. Regulation 42 CFR 414.229(g) requires that the supplier of the insulin pump in the first month must continue to provide the pump for the remainder of the 13-month capped rental period or until medical necessity for the pump ends, whichever is earlier.

Wyn Staheli, Director of Content, Find-A-Code, a product of innoviHealth Systems, Inc.  FindACode.com is an online database of medical billing codes and information. People use Find-A-Code to assign codes to medical diagnoses and procedures in order to be reimbursed by insurance companies and Medicare. FindACode.com is a quick and easy system that uses a simple search to return accurate information. Rather than searching through 10 or more books, Find-A-Code has combined the information into one simple search.