| T420X6D | Underdosing of hydantoin derivatives, subsequent encounter |
| T420X6S | Underdosing of hydantoin derivatives, sequela |
| T421 | Poisoning by, adverse effect of and underdosing of iminostilbenes |
| T421X | Poisoning by, adverse effect of and underdosing of iminostilbenes |
| T421X1 | Poisoning by iminostilbenes, accidental (unintentional) |
| T421X1A | Poisoning by iminostilbenes, accidental (unintentional), initial encounter |
| T421X1D | Poisoning by iminostilbenes, accidental (unintentional), subsequent encounter |
| T421X1S | Poisoning by iminostilbenes, accidental (unintentional), sequela |
| T421X2 | Poisoning by iminostilbenes, intentional self-harm |
| T421X2A | Poisoning by iminostilbenes, intentional self-harm, initial encounter |
| T421X2D | Poisoning by iminostilbenes, intentional self-harm, subsequent encounter |
| T421X2S | Poisoning by iminostilbenes, intentional self-harm, sequela |
| T421X3 | Poisoning by iminostilbenes, assault |
| T421X3A | Poisoning by iminostilbenes, assault, initial encounter |
| T421X3D | Poisoning by iminostilbenes, assault, subsequent encounter |
| T421X3S | Poisoning by iminostilbenes, assault, sequela |
| T421X4 | Poisoning by iminostilbenes, undetermined |
| T421X4A | Poisoning by iminostilbenes, undetermined, initial encounter Poisoning by iminostilbenes, undetermined, initial encounter |
| T421X4D | Poisoning by iminostilbenes, undetermined, subsequent encounter |
| T421X4S | Poisoning by iminostilbenes, undetermined, sequela |
| T421X5 | Adverse effect of iminostilbenes |
| T421X5A | Adverse effect of iminostilbenes, initial encounter |
| T421X5D | Adverse effect of iminostilbenes, subsequent encounter |
| T421X5S | Adverse effect of iminostilbenes, sequela |
| T421X6 | Underdosing of iminostilbenes |
| T421X6A | Underdosing of iminostilbenes, initial encounter |
| T421X6D | Underdosing of iminostilbenes, subsequent encounter |
| T421X6S | Underdosing of iminostilbenes, sequela |
| T422 | Poisoning by, adverse effect of and underdosing of succinimides and oxazolidinediones |
| T422X | Poisoning by, adverse effect of and underdosing of succinimides and oxazolidinediones |
| T422X1 | Poisoning by succinimides and oxazolidinediones, accidental (unintentional) |
| T422X1A | Poisoning by succinimides and oxazolidinediones, accidental (unintentional), initial encounter |
| T422X1D | Poisoning by succinimides and oxazolidinediones, accidental (unintentional), subsequent encounter |
| T422X1S | Poisoning by succinimides and oxazolidinediones, accidental (unintentional), sequela |
| T422X2 | Poisoning by succinimides and oxazolidinediones, intentional self-harm |
| T422X2A | Poisn by succinimides and oxazolidinediones, self-harm, init Poisoning by succinimides and oxazolidinediones, intentional self-harm, initial encounter |
| T422X2D | Poisn by succinimides and oxazolidinediones, self-harm, subs Poisoning by succinimides and oxazolidinediones, intentional self-harm, subsequent encounter |
| T422X2S | Poisoning by succinimides and oxazolidinediones, intentional self-harm, sequela |
| T422X3 | Poisoning by succinimides and oxazolidinediones, assault |
| T422X3A | Poisoning by succinimides and oxazolidinediones, assault, initial encounter |
| T422X3D | Poisoning by succinimides and oxazolidinediones, assault, subsequent encounter |
| T422X3S | Poisoning by succinimides and oxazolidinediones, assault, sequela |
| T422X4 | Poisoning by succinimides and oxazolidinediones, undetermined |
| T422X4A | Poisoning by succinimides and oxazolidinediones, undet, init Poisoning by succinimides and oxazolidinediones, undetermined, initial encounter |
| T422X4D | Poisoning by succinimides and oxazolidinediones, undet, subs Poisoning by succinimides and oxazolidinediones, undetermined, subsequent encounter |
| T422X4S | Poisoning by succinimides and oxazolidinediones, undetermined, sequela |
| T422X5 | Adverse effect of succinimides and oxazolidinediones |
| T422X5A | Adverse effect of succinimides and oxazolidinediones, initial encounter |
| T422X5D | Adverse effect of succinimides and oxazolidinediones, subsequent encounter |
| T422X5S | Adverse effect of succinimides and oxazolidinediones, sequela |