| ICD-10 Code | Description |
| T43.021A | Poisoning by tetracyclic antidepressants, accidental (unintentional), initial encounter |
| T43.021D | Poisoning by tetracyclic antidepressants, accidental (unintentional), subsequent encounter |
| T43.021S | Poisoning by tetracyclic antidepressants, accidental (unintentional), sequela |
| T43.022A | Poisoning by tetracyclic antidepressants, intentional self-harm, initial encounter |
| T43.022D | Poisoning by tetracyclic antidepressants, intentional self-harm, subsequent encounter |
| T43.022S | Poisoning by tetracyclic antidepressants, intentional self-harm, sequela |
| T43.023A | Poisoning by tetracyclic antidepressants, assault, initial encounter |
| T43.023D | Poisoning by tetracyclic antidepressants, assault, subsequent encounter |
| T43.023S | Poisoning by tetracyclic antidepressants, assault, sequela |
| T43.024A | Poisoning by tetracyclic antidepressants, undetermined, initial encounter |
| T43.024D | Poisoning by tetracyclic antidepressants, undetermined, subsequent encounter |
| T43.024S | Poisoning by tetracyclic antidepressants, undetermined, sequela |
| T43.025A | Adverse effect of tetracyclic antidepressants, initial encounter |
| T43.025D | Adverse effect of tetracyclic antidepressants, subsequent encounter |
| T43.025S | Adverse effect of tetracyclic antidepressants, sequela |
| T43.026A | Underdosing of tetracyclic antidepressants, initial encounter |
| T43.026D | Underdosing of tetracyclic antidepressants, subsequent encounter |
| T43.026S | Underdosing of tetracyclic antidepressants, sequela |
