T57.91 (Toxic effect of unspecified inorganic substance, accidental (unintentional)) compared with T57.93 (Toxic effect of unspecified inorganic substance, assault), from the official CMS tabular data. T57.91 and T57.93 code the same substance (Inorganic) with a different intent.
Same substance, different circumstance of exposure.
Same substance — assault (Inorganic)
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. T57.91 and T57.93 code the same substance (Inorganic) 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.
| T57.91Toxic effect of unspecified inorganic substance, accidental (unintentional) | T57.93Toxic effect of unspecified inorganic substance, assault | |
|---|---|---|
| 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 unspecified inorganic substance, accidental (unintentional) is a non-billable ICD-10-CM category code (T57.91). | Toxic effect of unspecified inorganic substance, assault is a non-billable ICD-10-CM category code (T57.93). |
| 7th character | The appropriate 7th character is to be added to each code from category T57 | The appropriate 7th character is to be added to each code from category T57 |
| 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