T56 vs T57.0

T56 (Toxic effect of metals) compared with T57.0 (Toxic effect of arsenic and its compounds), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Can these codes be reported together?

No — do not report together. T56 carries an Excludes1 note covering T57.0: “arsenic and its compounds (T57.0)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

	T56Toxic effect of metals	T57.0Toxic effect of arsenic and its compounds
Billing status	Non-billable header Report instead: T56.0X1A, T56.0X1D, T56.0X1S, T56.0X2A, T56.0X2D	Non-billable header Report instead: T57.0X1A, T57.0X1D, T57.0X1S, T57.0X2A, T57.0X2D
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	Toxic effect of metals is a non-billable ICD-10-CM category code (T56).	Toxic effect of arsenic and its compounds is a non-billable ICD-10-CM category code (T57.0).
7th character	The appropriate 7th character is to be added to each code from category T56	The appropriate 7th character is to be added to each code from category T57
Includes	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(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