MAUDE Adverse Event Report: TANDEM DIABETES CARE T:SLIM X2 INSULIN PUMP WITH CONTROL-IQ TECHNOLOGY; ALTERNATE CONTROLLER ENABLED INSULIN INFUSION PUMP

Model Number	1000096
Medical Device Problem Code	Incorrect Measurement (1383)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	06/26/2026
Type of Reportable Event	Malfunction
Event or Problem Description
It was reported that insulin gauge displayed amount different than expected on a previous day, with pump showing about 60 units when caller expected 100 to 108 units and difference was greater than 30 units, but pump was not displaying an unexpected amount at time of call.There was no reported impact to the customer¿s blood glucose level.Customer resolved issue by reloading same cartridge, declined email resources, and was instructed by technical support to call back for troubleshooting if a similar active fill estimate issue occurred again, which caller acknowledged.

• Brand Name: T:SLIM X2 INSULIN PUMP WITH CONTROL-IQ TECHNOLOGY
• Common Device Name: ALTERNATE CONTROLLER ENABLED INSULIN INFUSION PUMP
• Manufacturer (Section D): TANDEM DIABETES CARE; 12400 high bluff drive; san diego CA 92130
• Manufacturer Contact: john connell ; 12400 high bluff drive; san diego, CA 92130 ; 858 224-6281
• MDR Report Key: 25753479
• Report Number: 3013756811-2026-122516
• Device Sequence Number: 10517939
• Product Code: QFG
• UDI-Device Identifier: 00853052007301
• UDI-Public: (01)00853052007301
• Combination Product (Y/N): N
• Initial Reporter State: MI
• Initial Reporter Country: US
• PMA/510(K) Number: K203234
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Report Source: Consumer
• Initial Reporter Occupation: Other
• Type of Report: Initial
• Report Date (Section B): 07/08/2026

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: 1000096
• Device Catalogue Number: 1000898
• Was Device Available for Evaluation?: No
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 06/29/2026
• Initial Report FDA Received Date: 07/08/2026
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 11/27/2019
• Is the Device Labeled for Single Use? (Y/N): No
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Usage of Device: Reuse
• Patient Sequence Number: 1
• Patient Age: 67 YR
• Patient Sex: Female