MAUDE Adverse Event Report: Dexcom, Inc. Dexcom G6 Continuous Glucose Monitoring System

Model Number	9535-45
Medical Device Problem Code	Low Readings (2460)
Health Effect - Clinical Code	Hyperglycemia (1905)
Date of Event	09/09/2026
Type of Reportable Event	Malfunction
Event or Problem Description
It was reported that an inaccuracy between the continuous glucose monitor (cgm) and the blood glucose (bg) meter occurred.The sensor was inserted into an off-label insertion site, on (b)(6)2026.It was indicated that the patient entered bg values outside the 40¿400 mg/dl (2.2¿22.2 mmol/l) range, which is misuse of the device.Data was evaluated and the allegation was confirmed.The probable cause could not be determined via data.The reported glucose values fall within the d zone of the parkes error grid.The data investigation found a difference in values that falls within the c zone of the parkes error grid.No injury or medical intervention was reported.
Additional Manufacturer Narrative
(b)(4).

• Brand Name: Dexcom G6 Continuous Glucose Monitoring System
• Common Device Name: Continuous Glucose Monitor
• Manufacturer (Section D): Dexcom, Inc.; 6340 sequence dr.; san diego CA 92121
• Manufacturer (Section G): Dexcom, Inc.; 232 s dobson rd; mesa AZ 85202
• Manufacturer Contact: jaime chavez ; 6340 sequence dr.; san diego, CA 92121 ; +1(858)200-0200
• MDR Report Key: 50890241
• Report Number: 3004753838-2026-259298
• Device Sequence Number: 21523034
• Product Code: QBJ
• UDI-Device Identifier: 40386270000253
• UDI-Public: (01)40386270000253(11)260707(17)271231(10)7393104
• Combination Product (Y/N): N
• Initial Reporter State: CA
• Initial Reporter Country: US
• PMA/510(K) Number: DEN170088
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Serviced by Third Party (Y/N): N
• Reporter Type: Manufacturer
• Report Source: Consumer
• Type of Report: Initial
• Report Date (Section B): 09/24/2026

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: No
• Is this a Product Problem Report?: Yes
• Operator of Device: Lay User/Patient
• Device Model Number: 9535-45
• Device Catalogue Number: STS-OR-001
• Device Lot Number: 7393104
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: No
• Initial Date Received by Manufacturer: 09/09/2026
• Initial Report FDA Received Date: 09/24/2026
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 07/07/2026
• Is the Device Labeled for Single Use? (Y/N): Yes
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Usage of Device: Initial
• Patient Sequence Number: 1
• Concomitant Medical Products and Therapy/Usage Dates: Omnipod 5.
• Patient Age: 12 YR
• Patient Sex: Male
• Patient Weight: 145 LB