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