T65.93 (Toxic effect of unspecified substance, assault) compared with T65.94 (Toxic effect of unspecified substance, undetermined), from the official CMS tabular data. T65.93 and T65.94 code the same substance (Aerosol) with a different intent.
Same substance, different circumstance of exposure.
Same substance — undetermined intent (Aerosol)
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. T65.93 and T65.94 code the same substance (Aerosol) 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.
| T65.93Toxic effect of unspecified substance, assault | T65.94Toxic effect of unspecified substance, 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 unspecified substance, assault is a non-billable ICD-10-CM category code (T65.93). | Toxic effect of unspecified substance, undetermined is a non-billable ICD-10-CM category code (T65.94). |
| 7th character | The appropriate 7th character is to be added to each code from category T65 | The appropriate 7th character is to be added to each code from category T65 |
| 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