Chris, diagnosed 1978

Contact Us

We offer a variety of ways to get the help you need, on your schedule, including 24/7 technical support.


Support Center

Did you know that Tandem has an extensive library of educational and self-help materials to help you get the most out of your Tandem pump?



Get in Touch

Technical Support

(877) 801-6901
24 hours/day
7 days a week

Pump Renewals

(858) 935-8951
Email Renewals Team
6:00 AM to 5:00 PM  (Pacific)
Monday - Friday

Order Support

(877) 801-6901
6:00 AM to 5:00 PM (Pacific)
Monday - Friday

Corporate Offices


11075 Roselle Street
San Diego, California 92121
(858) 366-6900
8:00 AM to 4:00 PM (Pacific)
Monday - Friday


1500 West Shoreline Drive
Boise, Idaho 83702
(858) 366-6900
8:00 AM to 4:00 PM (Mountain)
Monday - Friday



Send a Message

Are you already using Tandem products? If so, please call our 24-hour Technical Support Team at (877) 801-6901. For other inquiries, please complete our form below.

By submitting this form, you grant Tandem Diabetes Care, Inc. permission to add your contact information to our database to send you information and communications related to our products. We respect and uphold the confidentiality of your personal information, and will not share your information with any third-parties, except as noted in our privacy policy. A link to our privacy policy is available at the bottom of this page.


Need help with your Dexcom CGM?

Dexcom and Tandem Diabetes Care® have agreed which system issues are best handled by each company, including which company is responsible for reporting those events to the appropriate regulatory authority. To help ensure that the required reporting takes place in a timely fashion, customers may need to contact Dexcom for some issues and Tandem for others. Tandem handles issues with the connection between your Dexcom transmitter and t:slim X2™ insulin pump, questions about calibration, the “???” display, and sensor failures after the 2-hour warmup period.

For all other continuous glucose monitoring (CGM) issues, including the sensor failure during the 2-hour warmup, “no restarts” alert or physical problems with your sensor or transmitter, such as bleeding, bruising, skin reaction, adhesive issues, applicator issues, or broken wires, you should contact Dexcom using one of the options on their Contact Us page.

Product Who to Contact
CGM Applicator Tandem For
Dexcom For
  • Physical Damage (e.g., Broken Needle, Cannula or Needle Retraction Issues, etc.)
  • Deployment Issue
  • Painful Insertion
CGM Transmitter Tandem For
  • Pairing Failure (Alert 29)
  • Signal Loss (Between Transmitter and Pump)
Dexcom For
  • Physical Damage
  • Transmitter Latch Issues
  • Difficulty Inserting or Removing Transmitter
  • Low Transmitter Battery Alert
  • Transmitter Failed Error
  • Overheating or Shocking
CGM Sensor Tandem For
  • Inaccurate CGM Values
  • Pump Will Not Accept Calibration Values or Other Calibration Errors
  • Early Sensor Expiration
  • Sensor Failure After 2hr Warmup
  • Pump Displays "---"
  • Pump Displays “No Readings”
  • Pump Displays “Sensor Error”
  • Pump Displays “Wait up to 3hrs”
  • Pump Displays Hourglass for Over 1hr
Dexcom For
  • Physical Damage (e.g., Broken, Detached, Missing Sensor Wire, etc.)
  • Poor or missing adhesive
  • No Initial Calibration
  • Sensor Failure During 2hr Warmup
  • New Sensor Inserted, but Displays “No Restarts” (Alert 25)
  • Bruising, Bleeding, Skin Reactions or other Discomfort