| T42.0X1 | Poisoning by hydantoin derivatives, accidental (unintentional) | NON-BILLABLE CODE |
| T42.0X1A | Poisoning by hydantoin derivatives, accidental (unintentional), initial encounter | BILLABLE CODE |
| T42.0X1D | Poisoning by hydantoin derivatives, accidental (unintentional), subsequent encounter | BILLABLE CODE |
| T42.0X1S | Poisoning by hydantoin derivatives, accidental (unintentional), sequela | BILLABLE CODE |
| T42.0X2 | Poisoning by hydantoin derivatives, intentional self-harm | NON-BILLABLE CODE |
| T42.0X2A | Poisoning by hydantoin derivatives, intentional self-harm, initial encounter | BILLABLE CODE |
| T42.0X2D | Poisoning by hydantoin derivatives, intentional self-harm, subsequent encounter | BILLABLE CODE |
| T42.0X2S | Poisoning by hydantoin derivatives, intentional self-harm, sequela | BILLABLE CODE |
| T42.0X3 | Poisoning by hydantoin derivatives, assault | NON-BILLABLE CODE |
| T42.0X3A | Poisoning by hydantoin derivatives, assault, initial encounter | BILLABLE CODE |
| T42.0X3D | Poisoning by hydantoin derivatives, assault, subsequent encounter | BILLABLE CODE |
| T42.0X3S | Poisoning by hydantoin derivatives, assault, sequela | BILLABLE CODE |
| T42.0X4 | Poisoning by hydantoin derivatives, undetermined | NON-BILLABLE CODE |
| T42.0X4A | Poisoning by hydantoin derivatives, undetermined, initial encounter | BILLABLE CODE |
| T42.0X4D | Poisoning by hydantoin derivatives, undetermined, subsequent encounter | BILLABLE CODE |
| T42.0X4S | Poisoning by hydantoin derivatives, undetermined, sequela | BILLABLE CODE |
| T42.0X5 | Adverse effect of hydantoin derivatives | NON-BILLABLE CODE |
| T42.0X5A | Adverse effect of hydantoin derivatives, initial encounter | BILLABLE CODE |
| T42.0X5D | Adverse effect of hydantoin derivatives, subsequent encounter | BILLABLE CODE |
| T42.0X5S | Adverse effect of hydantoin derivatives, sequela | BILLABLE CODE |
| T42.0X6 | Underdosing of hydantoin derivatives | NON-BILLABLE CODE |
| T42.0X6A | Underdosing of hydantoin derivatives, initial encounter | BILLABLE CODE |
| T42.0X6D | Underdosing of hydantoin derivatives, subsequent encounter | BILLABLE CODE |
| T42.0X6S | Underdosing of hydantoin derivatives, sequela | BILLABLE CODE |
