T43 is a non-billable/non-specific diagnosis code from the 2025 ICD-10-CM used to classify the following condition: Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified.
Type 1 excludes
Appetite depressants (T50.5-)
Barbiturates (T42.3-)
Benzodiazepines (T42.4-)
Methaqualone (T42.6-)
Psychodysleptics [hallucinogens] (T40.7-T40.9-)
Type 2 excludes
Drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.- -F19.-)
Seventh character note
The appropriate 7th character is to be added to each code from category T43
Seventh character extensions
A: initial encounter
D: subsequent encounter
S: sequela
Codes
T43.0
Poisoning by, adverse effect of and underdosing of tricyclic and tetracyclic antidepressants
T43.1
Poisoning by, adverse effect of and underdosing of monoamine-oxidase-inhibitor antidepressants
T43.2
Poisoning by, adverse effect of and underdosing of other and unspecified antidepressants
T43.3
Poisoning by, adverse effect of and underdosing of phenothiazine antipsychotics and neuroleptics
T43.4
Poisoning by, adverse effect of and underdosing of butyrophenone and thiothixene neuroleptics
T43.5
Poisoning by, adverse effect of and underdosing of other and unspecified antipsychotics and neuroleptics
T43.6
Poisoning by, adverse effect of and underdosing of psychostimulants
T43.8
Poisoning by, adverse effect of and underdosing of other psychotropic drugs
T43.9
Poisoning by, adverse effect of and underdosing of unspecified psychotropic drug
Versions
2025
No changes
2024
No changes
2023
No changes
2022
No changes
2021
No changes
2020
No changes
2019
No changes
2018
No changes
2017
No changes
2016
New code