T45.AX4Header code — not billable

Poisoning by immune checkpoint inhibitors and immunostimulant drugs, undetermined

Short description: Poisoning by immune chkpt inhibtr/immunostim drugs, undet

Chapter
19. Injury, poisoning and certain other consequences of external causes
Category
T45
Effective date
October 1, 2026

Related codes in category T45

T45Primarily systemic and hematological agents, NECT45.0Antiallergic and antiemetic drugsT45.0XAntiallergic and antiemetic drugsT45.0X1Poisoning by antiallerg/antiemetic, accidentalT45.0X1APoisoning by antiallerg/antiemetic, accidental, initYesT45.0X1DPoisoning by antiallerg/antiemetic, accidental, subsYesT45.0X1SPoisoning by antiallerg/antiemetic, accidental, sequelaYesT45.0X2Poisoning by antiallerg/antiemetic, intentional self-harmT45.0X2APoisoning by antiallerg/antiemetic, self-harm, initYesT45.0X2DPoisoning by antiallerg/antiemetic, self-harm, subsYesT45.0X2SPoisoning by antiallerg/antiemetic, self-harm, sequelaYesT45.0X3Poisoning by antiallergic and antiemetic drugs, assault

Frequently asked questions

What is ICD-10 code T45.AX4?

T45.AX4 is an ICD-10-CM diagnosis code for Poisoning by immune checkpoint inhibitors and immunostimulant drugs, undetermined.

Is T45.AX4 a billable code?

No. T45.AX4 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 T45.AX4 in?

T45.AX4 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.

When did T45.AX4 become effective?

T45.AX4 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to T45.AX4?

T45.AX4 belongs to category T45, 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.