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T54.3X3 vs T54.3X4

T54.3X3 (Toxic effect of corrosive alkalis and alkali-like substances, assault) compared with T54.3X4 (Toxic effect of corrosive alkalis and alkali-like substances, undetermined), from the official CMS tabular data. T54.3X3 and T54.3X4 code the same substance (Alkali) with a different intent.

Relationship

Informational

Drug table relationship

T54.3X3
Toxic effect of corrosive alkalis and alkali-like substances, assault
↔
T54.3X4
Toxic effect of corrosive alkalis and alkali-like substances, undetermined

Same substance, different circumstance of exposure.

Same substance — undetermined intent (Alkali)

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. T54.3X3 and T54.3X4 code the same substance (Alkali) 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

T54.3X3Toxic effect of corrosive alkalis and alkali-like substances, assaultT54.3X4Toxic effect of corrosive alkalis and alkali-like substances, undetermined
Billing statusNon-billable headerNon-billable header
ClassificationS00-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)
DefinitionToxic effect of corrosive alkalis and alkali-like substances, assault is a non-billable ICD-10-CM category code (T54.3X3).Toxic effect of corrosive alkalis and alkali-like substances, undetermined is a non-billable ICD-10-CM category code (T54.3X4).
7th characterThe appropriate 7th character is to be added to each code from category T54The appropriate 7th character is to be added to each code from category T54
Use additional code
code(s):
for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
personal history of foreign body fully removed (Z87.821)
code(s):
for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
personal history of foreign body fully removed (Z87.821)
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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