T63.421 (Toxic effect of venom of ants, accidental (unintentional)) compared with T63.422 (Toxic effect of venom of ants, intentional self-harm), from the official CMS tabular data. T63.421 and T63.422 code the same substance (Ant) with a different intent.
Same substance, different circumstance of exposure.
Same substance — intentional self-harm (Ant)
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. T63.421 and T63.422 code the same substance (Ant) 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.
| T63.421Toxic effect of venom of ants, accidental (unintentional) | T63.422Toxic effect of venom of ants, intentional self-harm | |
|---|---|---|
| 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 venom of ants, accidental (unintentional) is a non-billable ICD-10-CM category code (T63.421). | Toxic effect of venom of ants, intentional self-harm is a non-billable ICD-10-CM category code (T63.422). |
| 7th character | The appropriate 7th character is to be added to each code from category T63 | The appropriate 7th character is to be added to each code from category T63 |
| Includes | bite or touch of venomous animal pricked or stuck by thorn or leaf | bite or touch of venomous animal pricked or stuck by thorn or leaf |
| Use additional code | code, if applicable, for anaphylactic shock (T78.2) code(s): for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70) | code, if applicable, for anaphylactic shock (T78.2) code(s): for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources