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T56.4X1 vs T56.4X4

T56.4X1 (Toxic effect of copper and its compounds, accidental (unintentional)) compared with T56.4X4 (Toxic effect of copper and its compounds, undetermined), from the official CMS tabular data. T56.4X1 and T56.4X4 code the same substance (CopperNEC) with a different intent.

Relationship

Informational

Drug table relationship

T56.4X1
Toxic effect of copper and its compounds, accidental (unintentional)
↔
T56.4X4
Toxic effect of copper and its compounds, undetermined

Same substance, different circumstance of exposure.

Same substance — undetermined intent (CopperNEC)

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. T56.4X1 and T56.4X4 code the same substance (CopperNEC) 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

T56.4X1Toxic effect of copper and its compounds, accidental (unintentional)T56.4X4Toxic effect of copper and its compounds, 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 copper and its compounds, accidental (unintentional) is a non-billable ICD-10-CM category code (T56.4X1).Toxic effect of copper and its compounds, undetermined is a non-billable ICD-10-CM category code (T56.4X4).
7th characterThe appropriate 7th character is to be added to each code from category T56The appropriate 7th character is to be added to each code from category T56
Includes
toxic effects of fumes and vapors of metals
toxic effects of metals from all sources, except medicinal substances
Toxic effects of copper and its compounds NOS
toxic effects of fumes and vapors of metals
toxic effects of metals from all sources, except medicinal substances
Use additional code
code to identify any retained metal foreign body, if applicable (Z18.0-, T18.1-)
code(s):
for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
code to identify any retained metal foreign body, if applicable (Z18.0-, T18.1-)
code(s):
for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
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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