T42.8XHeader code — not billable

Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressants

Short description: Antiparkns drug/centr muscle-tone depressants

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 T42.8X?

T42.8X is an ICD-10-CM diagnosis code for Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressants.

Is T42.8X a billable code?

No. T42.8X 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 T42.8X in?

T42.8X falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.

When did T42.8X become effective?

T42.8X has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to T42.8X?

T42.8X 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.