T40.416ABillable
Underdosing of fentanyl or fentanyl analogs, initial encounter
Short description: Underdosing of fentanyl or fentanyl analogs, init
- 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 T40.416A?
T40.416A is an ICD-10-CM diagnosis code for Underdosing of fentanyl or fentanyl analogs, initial encounter.
Is T40.416A a billable code?
Yes. T40.416A is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is T40.416A in?
T40.416A falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did T40.416A become effective?
T40.416A has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to T40.416A?
T40.416A 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.