T50.6X2 vs T50.6X4

T50.6X2 (Poisoning by antidotes and chelating agents, intentional self-harm) compared with T50.6X4 (Poisoning by antidotes and chelating agents, undetermined), from the official CMS tabular data. T50.6X2 and T50.6X4 code the same substance (Antabuse) with a different intent. MedCoder-derived

Relationship

Informational

Drug table relationship

T50.6X2

Poisoning by antidotes and chelating agents, intentional self-harm

↔

T50.6X4

Poisoning by antidotes and chelating agents, undetermined

Same substance, different circumstance of exposure.

Same substance — undetermined intent (Antabuse)

Accidental poisoning, intentional self-harm, assault, undetermined intent, adverse effect and underdosing are mutually exclusive columns — exactly one applies to a given encounter.

Source: CMS Table of Drugs and Chemicals

Can these codes be reported together?

Same substance, different intent. T50.6X2 and T50.6X4 code the same substance (Antabuse) with a different circumstance of exposure.

From the CMS/CDC Table of Drugs and Chemicals: accidental poisoning, intentional self-harm, assault, undetermined intent, adverse effect and underdosing are mutually exclusive columns — only one of them applies to a given encounter.

Side by side

	T50.6X2Poisoning by antidotes and chelating agents, intentional self-harm	T50.6X4Poisoning by antidotes and chelating agents, undetermined
Billing status	Non-billable header Report instead: T50.6X2A, T50.6X2D, T50.6X2S	Non-billable header Report instead: T50.6X4A, T50.6X4D, T50.6X4S
Classification	S00-T88 — Injury, poisoning and certain other consequences of external causes	S00-T88 — Injury, poisoning and certain other consequences of external causes
Definition	Poisoning by antidotes and chelating agents, intentional self-harm is a non-billable ICD-10-CM category code (T50.6X2).	Poisoning by antidotes and chelating agents, undetermined is a non-billable ICD-10-CM category code (T50.6X4).
7th character	The appropriate 7th character is to be added to each code from category T50	The appropriate 7th character is to be added to each code from category T50
Includes	adverse effect of correct substance properly administered poisoning by overdose of substance poisoning by wrong substance given or taken in error underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed	adverse effect of correct substance properly administered poisoning by overdose of substance poisoning by wrong substance given or taken in error underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed
Use additional code	code(s) to specify: manifestations of poisoning underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)	code(s) to specify: manifestations of poisoning underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
Code first	, for adverse effects, the nature of the adverse effect, such as: adverse effect NOS (T88.7)	, for adverse effects, the nature of the adverse effect, such as: adverse effect NOS (T88.7)

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources