| T403X1S | Poisoning by methadone, accidental (unintentional), sequela |
| T403X2 | Poisoning by methadone, intentional self-harm |
| T403X2A | Poisoning by methadone, intentional self-harm, initial encounter |
| T403X2D | Poisoning by methadone, intentional self-harm, subsequent encounter |
| T403X2S | Poisoning by methadone, intentional self-harm, sequela |
| T403X3 | Poisoning by methadone, assault |
| T403X3A | Poisoning by methadone, assault, initial encounter |
| T403X3D | Poisoning by methadone, assault, subsequent encounter |
| T403X3S | Poisoning by methadone, assault, sequela |
| T403X4 | Poisoning by methadone, undetermined |
| T403X4A | Poisoning by methadone, undetermined, initial encounter |
| T403X4D | Poisoning by methadone, undetermined, subsequent encounter |
| T403X4S | Poisoning by methadone, undetermined, sequela |
| T403X5 | Adverse effect of methadone |
| T403X5A | Adverse effect of methadone, initial encounter |
| T403X5D | Adverse effect of methadone, subsequent encounter |
| T403X5S | Adverse effect of methadone, sequela |
| T403X6 | Underdosing of methadone |
| T403X6A | Underdosing of methadone, initial encounter |
| T403X6D | Underdosing of methadone, subsequent encounter |
| T403X6S | Underdosing of methadone, sequela |
| T404 | Poisoning by, adverse effect of and underdosing of other synthetic narcotics |
| T4041 | Poisoning by, adverse effect of and underdosing of fentanyl or fentanyl analogs |
| T40411 | Poisoning by fentanyl or fentanyl analogs, accidental (unintentional) |
| T40411A | Poisoning by fentanyl or fentanyl analogs, accidental (unintentional), initial encounter |
| T40411D | Poisoning by fentanyl or fentanyl analogs, accidental (unintentional), subsequent encounter |
| T40411S | Poisoning by fentanyl or fentanyl analogs, accidental (unintentional), sequela |
| T40412 | Poisoning by fentanyl or fentanyl analogs, intentional self-harm |
| T40412A | Poisoning by fentanyl or fentanyl analogs, intentional self-harm, initial encounter |
| T40412D | Poisoning by fentanyl or fentanyl analogs, intentional self-harm, subsequent encounter |
| T40412S | Poisoning by fentanyl or fentanyl analogs, intentional self-harm, sequela |
| T40413 | Poisoning by fentanyl or fentanyl analogs, assault |
| T40413A | Poisoning by fentanyl or fentanyl analogs, assault, initial encounter |
| T40413D | Poisoning by fentanyl or fentanyl analogs, assault, subsequent encounter |
| T40413S | Poisoning by fentanyl or fentanyl analogs, assault, sequela |
| T40414 | Poisoning by fentanyl or fentanyl analogs, undetermined |
| T40414A | Poisoning by fentanyl or fentanyl analogs, undetermined, initial encounter |
| T40414D | Poisoning by fentanyl or fentanyl analogs, undetermined, subsequent encounter |
| T40414S | Poisoning by fentanyl or fentanyl analogs, undetermined, sequela |
| T40415 | Adverse effect of fentanyl or fentanyl analogs |
| T40415A | Adverse effect of fentanyl or fentanyl analogs, initial encounter |
| T40415D | Adverse effect of fentanyl or fentanyl analogs, subsequent encounter |
| T40415S | Adverse effect of fentanyl or fentanyl analogs, sequela |
| T40416 | Underdosing of fentanyl or fentanyl analogs |
| T40416A | Underdosing of fentanyl or fentanyl analogs, initial encounter |
| T40416D | Underdosing of fentanyl or fentanyl analogs, subsequent encounter |
| T40416S | Underdosing of fentanyl or fentanyl analogs, sequela |
| T4042 | Poisoning by, adverse effect of and underdosing of tramadol |
| T40421 | Poisoning by tramadol, accidental (unintentional) |
| T40421A | Poisoning by tramadol, accidental (unintentional), initial encounter |