T42.4XHeader code — not billable
Poisoning by, adverse effect of and underdosing of benzodiazepines
Short description: Benzodiazepines
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes
- Category
- T42
- Effective date
- October 1, 2026
Related codes in category T42
T42Antiepileptic, sedative- hypnotic and antiparkinsonism drugsT42.0Hydantoin derivativesT42.0XHydantoin derivativesT42.0X1Poisoning by hydantoin derivatives, accidentalT42.0X1APoisoning by hydantoin derivatives, accidental, initYesT42.0X1DPoisoning by hydantoin derivatives, accidental, subsYesT42.0X1SPoisoning by hydantoin derivatives, accidental, sequelaYesT42.0X2Poisoning by hydantoin derivatives, intentional self-harmT42.0X2APoisoning by hydantoin derivatives, self-harm, initYesT42.0X2DPoisoning by hydantoin derivatives, self-harm, subsYesT42.0X2SPoisoning by hydantoin derivatives, self-harm, sequelaYesT42.0X3Poisoning by hydantoin derivatives, assault
Frequently asked questions
What is ICD-10 code T42.4X?
T42.4X is an ICD-10-CM diagnosis code for Poisoning by, adverse effect of and underdosing of benzodiazepines.
Is T42.4X a billable code?
No. T42.4X 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 T42.4X in?
T42.4X falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did T42.4X become effective?
T42.4X has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to T42.4X?
T42.4X belongs to category T42, 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.