Summary & Overview
HCPCS A9277: External Transmitter for Interstitial Continuous Glucose Monitor
HCPCS Level II code A9277 covers an external transmitter component used with non-durable interstitial continuous glucose monitoring (CGM) systems. As an accessory to CGM devices, the transmitter is a critical link in relaying sensor data to receivers, smartphones, or monitoring platforms and supports remote glucose monitoring workflows nationwide. Recognition of this HCPCS Level II code matters for benefit design, claims processing, and coverage determinations tied to diabetes management technologies.
Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication outlines typical coverage considerations across commercial and federal programs, common billing practice implications, and where this component fits into CGM supply chains.
Readers will learn: the clinical and billing role of the transmitter within interstitial CGM systems; the expected service type and sites of service (outpatient and home use); typical payer attention points for reimbursement and claims submission; and which data elements are available or not provided for this code. Data not available in the input will be explicitly noted in the relevant sections. This summary provides a national perspective to inform coding, contracting, and operational discussions related to CGM device components.
Billing Code Overview
HCPCS Level II code A9277 represents a transmitter, external, for use with non-durable medical equipment interstitial continuous glucose monitoring system. This device component transmits glucose sensor data from an interstitial continuous glucose monitoring (CGM) system to a receiver or display device.
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Service type: Durable medical equipment component and remote monitoring accessory
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Typical site of service: Outpatient setting, home use, and durable medical equipment supply environments
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with insulin-treated diabetes mellitus (type 1 or insulin-requiring type 2) who is prescribed an interstitial continuous glucose monitoring (CGM) system that includes a disposable sensor, a non-durable external transmitter, and a receiver or smartphone app. The patient presents to an outpatient diabetes clinic or durable medical equipment (DME) supplier for transmitter replacement due to end of transmitter warranty, loss, damage, or routine device upgrade. Clinical workflow: clinician documents medical necessity (eg, need for ongoing glucose monitoring to manage insulin therapy), verifies prescription for the specific CGM system, obtains prior authorization if required by payer, and orders the external transmitter (A9277) from a contracted DME vendor. The vendor receives the order, confirms patient eligibility, bills the payer for the transmitter, and provides device education and pairing assistance with the patient’s receiver or smartphone during an outpatient visit or remote telehealth session. Typical site of service: outpatient clinic, DME supplier, or patient’s home during a home health or telehealth education session.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier | Standard billing without special circumstances when a single service is reported |