T40.491Header code — not billable
Poisoning by other synthetic narcotics, accidental (unintentional)
Short description: Poisoning by other synthetic narcotics, accidental
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes
- Category
- T40
- Effective date
- October 1, 2026
Related codes in category T40
T40Narcotics and psychodyslepticsT40.0Poisoning by, adverse effect of and underdosing of opiumT40.0XPoisoning by, adverse effect of and underdosing of opiumT40.0X1Poisoning by opium, accidental (unintentional)T40.0X1APoisoning by opium, accidental (unintentional), init encntrYesT40.0X1DPoisoning by opium, accidental (unintentional), subs encntrYesT40.0X1SPoisoning by opium, accidental (unintentional), sequelaYesT40.0X2Poisoning by opium, intentional self-harmT40.0X2APoisoning by opium, intentional self-harm, initial encounterYesT40.0X2DPoisoning by opium, intentional self-harm, subs encntrYesT40.0X2SPoisoning by opium, intentional self-harm, sequelaYesT40.0X3Poisoning by opium, assault
Frequently asked questions
What is ICD-10 code T40.491?
T40.491 is an ICD-10-CM diagnosis code for Poisoning by other synthetic narcotics, accidental (unintentional).
Is T40.491 a billable code?
No. T40.491 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is T40.491 in?
T40.491 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did T40.491 become effective?
T40.491 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to T40.491?
T40.491 belongs to category T40, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.