T48.901 vs T48.904

T48.901 (Poisoning by unspecified agents primarily acting on the respiratory system, accidental (unintentional)) compared with T48.904 (Poisoning by unspecified agents primarily acting on the respiratory system, undetermined), from the official CMS tabular data. T48.901 and T48.904 code the same substance (Respiratory) with a different intent.

Relationship

Informational

Drug table relationship

T48.901

Poisoning by unspecified agents primarily acting on the respiratory system, accidental (unintentional)

↔

T48.904

Poisoning by unspecified agents primarily acting on the respiratory system, undetermined

Same substance, different circumstance of exposure.

Same substance — undetermined intent (Respiratory)

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. T48.901 and T48.904 code the same substance (Respiratory) with a different circumstance of exposure.

From the CMS 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

	T48.901Poisoning by unspecified agents primarily acting on the respiratory system, accidental (unintentional)	T48.904Poisoning by unspecified agents primarily acting on the respiratory system, undetermined
Billing status	Non-billable header	Non-billable header
Classification	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
Definition	Poisoning by unspecified agents primarily acting on the respiratory system, accidental (unintentional) is a non-billable ICD-10-CM category code (T48.901).	Poisoning by unspecified agents primarily acting on the respiratory system, undetermined is a non-billable ICD-10-CM category code (T48.904).
7th character	The appropriate 7th character is to be added to each code from category T48	The appropriate 7th character is to be added to each code from category T48
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