T37.9Header code — not billable

Poisoning by, adverse effect of and underdosing of unspecified systemic anti-infective and antiparasitics

Short description: Unsp systemic anti-infective and antiparasitics

Chapter
19. Injury, poisoning and certain other consequences of external causes
Category
T37
Effective date
October 1, 2026

Related codes in category T37

T37Other systemic anti-infectives and antiparasiticsT37.0SulfonamidesT37.0XSulfonamidesT37.0X1Poisoning by sulfonamides, accidental (unintentional)T37.0X1APoisoning by sulfonamides, accidental (unintentional), initYesT37.0X1DPoisoning by sulfonamides, accidental (unintentional), subsYesT37.0X1SPoisoning by sulfonamides, accidental, sequelaYesT37.0X2Poisoning by sulfonamides, intentional self-harmT37.0X2APoisoning by sulfonamides, intentional self-harm, initYesT37.0X2DPoisoning by sulfonamides, intentional self-harm, subsYesT37.0X2SPoisoning by sulfonamides, intentional self-harm, sequelaYesT37.0X3Poisoning by sulfonamides, assault

Frequently asked questions

What is ICD-10 code T37.9?

T37.9 is an ICD-10-CM diagnosis code for Poisoning by, adverse effect of and underdosing of unspecified systemic anti-infective and antiparasitics.

Is T37.9 a billable code?

No. T37.9 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 T37.9 in?

T37.9 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.

When did T37.9 become effective?

T37.9 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to T37.9?

T37.9 belongs to category T37, 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.