What type of code is assigned to an overdose caused by an insulin pump malfunction?

An insulin pump malfunction that leads to an overdose would be assigned a code from the T85 series, specifically T85.6-. This code pertains to complications that arise due to the malfunction of a device, specifically categorized as complications of implanted devices or grafts.

The T85.6- code is suitable because it specifically addresses issues related to implanted devices, which includes insulin pumps. By using this code, the healthcare provider can specifically indicate the cause of the overdose as being related to the malfunction of the pump, allowing for more precise data collection and tracking for complications arising from medical devices.

Other options do not pertain to the situation where an overdose is caused specifically by a device malfunction. For example, the Z79 codes are used for long-term drug therapy, while E13 and E09 codes are associated with specific types of diabetes and do not cover device malfunctions. Thus, T85.6- is the most appropriate code to indicate the nature of the incident.