T44.99Header code — not billable

Poisoning by, adverse effect of and underdosing of other drugs primarily affecting the autonomic nervous system

Short description: Drugs primarily affecting the autonomic nervous system

Chapter
19. Injury, poisoning and certain other consequences of external causes
Category
T44
Effective date
October 1, 2026

Related codes in category T44

T44Drugs primarily affecting the autonomic nervous systemT44.0Anticholinesterase agentsT44.0XAnticholinesterase agentsT44.0X1Poisoning by anticholin agents, accidental (unintentional)T44.0X1APoisoning by anticholin agents, accidental, initYesT44.0X1DPoisoning by anticholin agents, accidental, subsYesT44.0X1SPoisoning by anticholin agents, accidental, sequelaYesT44.0X2Poisoning by anticholinesterase agents, self-harmT44.0X2APoisoning by anticholinesterase agents, self-harm, initYesT44.0X2DPoisoning by anticholinesterase agents, self-harm, subsYesT44.0X2SPoisoning by anticholinesterase agents, self-harm, sequelaYesT44.0X3Poisoning by anticholinesterase agents, assault

Frequently asked questions

What is ICD-10 code T44.99?

T44.99 is an ICD-10-CM diagnosis code for Poisoning by, adverse effect of and underdosing of other drugs primarily affecting the autonomic nervous system.

Is T44.99 a billable code?

No. T44.99 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 T44.99 in?

T44.99 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.

When did T44.99 become effective?

T44.99 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to T44.99?

T44.99 belongs to category T44, 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.