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T59.1X2 vs T59.1X4

T59.1X2 (Toxic effect of sulfur dioxide, intentional self-harm) compared with T59.1X4 (Toxic effect of sulfur dioxide, undetermined), from the official CMS tabular data. T59.1X2 and T59.1X4 code the same substance (Smog) with a different intent.

Can these codes be reported together?

Same substance, different intent. T59.1X2 and T59.1X4 code the same substance (Smog) 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

T59.1X2Toxic effect of sulfur dioxide, intentional self-harmT59.1X4Toxic effect of sulfur dioxide, 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 sulfur dioxide, intentional self-harm is a non-billable ICD-10-CM category code (T59.1X2).Toxic effect of sulfur dioxide, undetermined is a non-billable ICD-10-CM category code (T59.1X4).
7th characterThe appropriate 7th character is to be added to each code from category T59The appropriate 7th character is to be added to each code from category T59
Includes
aerosol propellants
aerosol propellants
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