Poisoning by other opioids, undetermined, initial encounter

This code indicates an adverse physiological effect resulting from exposure to an opioid other than heroin, methadone, or other specified natural or synthetic opioids, where the intent (e.g., accidental, intentional self-harm, assault) cannot be determined. The patient is receiving active treatment for the poisoning.

Apply this code when a patient presents with symptoms of opioid poisoning, and the specific opioid involved is known to be one of the "other opioids" (e.g., fentanyl, oxycodone, hydrocodone) but the circumstances surrounding the exposure are unclear or undocumented. This code is appropriate for the initial visit where treatment for the poisoning is being rendered.

• Ensure documentation clearly states "undetermined" intent for the poisoning.
• Always assign an additional code for the specific opioid if known (e.g., T40.4X1- for fentanyl).
• Use a seventh character of 'D' for subsequent encounters and 'S' for sequela.