T59.6X3 (Toxic effect of hydrogen sulfide, assault) compared with T59.6X4 (Toxic effect of hydrogen sulfide, undetermined), from the official CMS tabular data. T59.6X3 and T59.6X4 code the same substance (Hydrosulfuric) with a different intent.
Same substance, different circumstance of exposure.
Same substance — undetermined intent (Hydrosulfuric)
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
Same substance, different intent. T59.6X3 and T59.6X4 code the same substance (Hydrosulfuric) 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.
| T59.6X3Toxic effect of hydrogen sulfide, assault | T59.6X4Toxic effect of hydrogen sulfide, 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 | Toxic effect of hydrogen sulfide, assault is a non-billable ICD-10-CM category code (T59.6X3). | Toxic effect of hydrogen sulfide, undetermined is a non-billable ICD-10-CM category code (T59.6X4). |
| 7th character | The appropriate 7th character is to be added to each code from category T59 | The 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) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources