Summary & Overview
HCPCS G0309: Removal and Replacement of 180-Day Implantable Glucose Sensor
HCPCS Level II code G0309 covers the combined procedure of removing an implantable interstitial glucose sensor, creating a new subcutaneous pocket at a different anatomic site, and inserting and activating a replacement 180-day implantable sensor. This outpatient surgical service is clinically important for patients requiring long-term continuous glucose monitoring when sensor relocation or replacement is necessary. Nationally, the code matters for managing durable implanted glucose monitoring technology, influencing device lifecycle workflows and outpatient surgical resource use.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical scope, typical sites of service, and common billing modifiers used with this procedure. The publication also summarizes national benchmarking considerations and policy topics relevant to coverage and claims processing for implantable continuous glucose monitoring systems.
This report is intended to inform billing managers, revenue cycle staff, clinicians, and policy analysts about the procedural definition and billing context for G0309, helping stakeholders understand how the service is reported, where it is typically performed, and which payers are commonly involved. Data not available in the input will be identified where applicable.
Billing Code Overview
HCPCS Level II code G0309 describes the removal of an implantable interstitial glucose sensor with creation of a subcutaneous pocket at a different anatomic site and insertion of a new 180 day implantable sensor, including system activation. This procedure involves explanting an existing implantable glucose monitoring device, creating a new subcutaneous pocket at a separate anatomic location, implanting a replacement sensor designed for up to 180 days of use, and performing activation of the monitoring system.
-
Service Type: Surgical removal and reimplantation of an implantable interstitial glucose sensor with system activation
-
Typical Site of Service: Ambulatory surgical center or hospital outpatient department
Clinical & Coding Specifications
Clinical Context
A 58-year-old patient with insulin-requiring diabetes mellitus presents for replacement of an implanted interstitial continuous glucose monitoring (CGM) sensor. The existing 180-day implantable sensor has reached end of service or is malfunctioning and requires removal. The clinician removes the prior implantable interstitial glucose sensor, creates a new subcutaneous pocket at a different anatomic site, inserts a new 180-day implantable sensor, and activates the system in the office-based procedure room under local anesthesia with brief observation. The workflow includes pre-procedure verification of device and patient consent, sterile preparation of both sites, removal of the old sensor with hemostasis, creation of a new subcutaneous pocket, insertion and securement of the new sensor, device activation/calibration per manufacturer instructions, patient education on device use and wound care, and scheduling of follow-up for site check and data review. Typical setting is an ambulatory surgery center or office-based procedural suite; general anesthesia is rarely required. Common clinical indications include type 1 diabetes, insulin-requiring type 2 diabetes, sensor malfunction, or sensor end-of-life requiring replacement at a different anatomic site.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work required is substantially greater than typically required for G0309 (document rationale, time, complexity). |