MAUDE Adverse Event Report: Tandem Diabetes Care t:slim X2 Insulin Pump with Control-IQ+ Technology; Alternate Controller Enabled Insulin Infusion Pump

Catalog Number	1014072
Medical Device Problem Code	Incorrect Measurement (1383)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	09/22/2026
Type of Reportable Event	Malfunction
Event or Problem Description
It was reported that the insulin gauge was inaccurate.There was no reported adverse impact to the customer.The customer declined follow-up from tandem technical support regarding the issue, therefore no additional information was obtained.
Additional Manufacturer Narrative
In use at the time of the event: cgm model: unknown.Mobile os: ios / ios_iphone 8 plus / unknown / ios_16.7.8.

• 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 ; +1(858)224-6281
• MDR Report Key: 50916536
• Report Number: 3013756811-2026-175866
• Device Sequence Number: 14800941
• Product Code: QFG
• UDI-Device Identifier: 00389152407210
• UDI-Public: (01)00389152407210(22)1019459(11)260813
• Combination Product (Y/N): N
• Initial Reporter State: UT
• Initial Reporter Country: US
• PMA/510(K) Number: K250792
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Reporter Type: Manufacturer
• Report Source: Consumer
• Type of Report: Initial
• Report Date (Section B): 09/28/2026

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 Catalogue Number: 1014072
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: No
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 09/22/2026
• Initial Report FDA Received Date: 09/28/2026
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 08/13/2026
• 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: 70 YR
• Patient Sex: Male
• Patient Weight: 235 LB