| ICD-10 Code | Description |
| T42.0X1A | Poisoning by hydantoin derivatives, accidental (unintentional), initial encounter |
| T42.0X1D | Poisoning by hydantoin derivatives, accidental (unintentional), subsequent encounter |
| T42.0X1S | Poisoning by hydantoin derivatives, accidental (unintentional), sequela |
| T42.0X2A | Poisoning by hydantoin derivatives, intentional self-harm, initial encounter |
| T42.0X2D | Poisoning by hydantoin derivatives, intentional self-harm, subsequent encounter |
| T42.0X2S | Poisoning by hydantoin derivatives, intentional self-harm, sequela |
| T42.0X3A | Poisoning by hydantoin derivatives, assault, initial encounter |
| T42.0X3D | Poisoning by hydantoin derivatives, assault, subsequent encounter |
| T42.0X3S | Poisoning by hydantoin derivatives, assault, sequela |
| T42.0X4A | Poisoning by hydantoin derivatives, undetermined, initial encounter |
| T42.0X4D | Poisoning by hydantoin derivatives, undetermined, subsequent encounter |
| T42.0X4S | Poisoning by hydantoin derivatives, undetermined, sequela |
| T42.0X5A | Adverse effect of hydantoin derivatives, initial encounter |
| T42.0X5D | Adverse effect of hydantoin derivatives, subsequent encounter |
| T42.0X5S | Adverse effect of hydantoin derivatives, sequela |
| T42.0X6A | Underdosing of hydantoin derivatives, initial encounter |
| T42.0X6D | Underdosing of hydantoin derivatives, subsequent encounter |
| T42.0X6S | Underdosing of hydantoin derivatives, sequela |
