T65.1X2 (Toxic effect of strychnine and its salts, intentional self-harm) compared with T65.1X4 (Toxic effect of strychnine and its salts, undetermined), from the official CMS tabular data. T65.1X2 and T65.1X4 code the same substance (Brucine) with a different intent.
Same substance, different circumstance of exposure.
Same substance — undetermined intent (Brucine)
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. T65.1X2 and T65.1X4 code the same substance (Brucine) 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.
| T65.1X2Toxic effect of strychnine and its salts, intentional self-harm | T65.1X4Toxic effect of strychnine and its salts, 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 strychnine and its salts, intentional self-harm is a non-billable ICD-10-CM category code (T65.1X2). | Toxic effect of strychnine and its salts, undetermined is a non-billable ICD-10-CM category code (T65.1X4). |
| 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