T59.7X1 (Toxic effect of carbon dioxide, accidental (unintentional)) compared with T59.7X2 (Toxic effect of carbon dioxide, intentional self-harm), from the official CMS tabular data. T59.7X1 and T59.7X2 code the same substance (Carbonic) with a different intent. MedCoder-derived
Same substance, different circumstance of exposure.
Same substance — intentional self-harm (Carbonic)
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. T59.7X1 and T59.7X2 code the same substance (Carbonic) with a different circumstance of exposure.
From the CMS/CDC 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.
| T59.7X1Toxic effect of carbon dioxide, accidental (unintentional) | T59.7X2Toxic effect of carbon dioxide, 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 — Injury, poisoning and certain other consequences of external causes |
| Definition | Toxic effect of carbon dioxide, accidental (unintentional) is a non-billable ICD-10-CM category code (T59.7X1). | Toxic effect of carbon dioxide, intentional self-harm is a non-billable ICD-10-CM category code (T59.7X2). |
| 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 Toxic effect of carbon dioxide NOS | 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