ICD-10-CM 2027 diagnosis code
T43Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified
Not billable — use a more specific code
T43 is a header code, so it can't be reported by itself. Choose one of the 9 more specific codes beneath it.Short description: Psychotropic drugs, not elsewhere classified
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About T43
T43 is the ICD-10-CM diagnosis code for poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified. It belongs to block T36-T50 (poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: T43.0 (antidepressants), T43.1 (antidepressants), T43.2 (antidepressants), T43.3 (neuroleptics), T43.4 (neuroleptics), T43.5 (neuroleptics), T43.6 (psychostimulants), T43.8 (drugs) and 1 more.
The conditions in its Excludes2 note aren't part of T43, but may be coded alongside it if the patient has both: appetite depressants (T50.5-), barbiturates (T42.3-), benzodiazepines (T42.4-), drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.- -F19.-) and 2 more.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under T43
- T43.0Poisoning by, adverse effect of and underdosing of tricyclic and tetracyclic antidepressants
- T43.01Poisoning by, adverse effect of and underdosing of tricyclic antidepressants
- T43.011Poisoning by tricyclic antidepressants, accidental (unintentional)
- T43.012Poisoning by tricyclic antidepressants, intentional self-harm
- T43.013Poisoning by tricyclic antidepressants, assault
- T43.014Poisoning by tricyclic antidepressants, undetermined
- T43.015Adverse effect of tricyclic antidepressants
- T43.016Underdosing of tricyclic antidepressants
- T43.02Poisoning by, adverse effect of and underdosing of tetracyclic antidepressants
- T43.021Poisoning by tetracyclic antidepressants, accidental (unintentional)
- T43.022Poisoning by tetracyclic antidepressants, intentional self-harm
- T43.023Poisoning by tetracyclic antidepressants, assault
- T43.024Poisoning by tetracyclic antidepressants, undetermined
- T43.025Adverse effect of tetracyclic antidepressants
- T43.026Underdosing of tetracyclic antidepressants
- T43.01Poisoning by, adverse effect of and underdosing of tricyclic antidepressants
- T43.1Poisoning by, adverse effect of and underdosing of monoamine-oxidase-inhibitor antidepressants
- T43.1XPoisoning by, adverse effect of and underdosing of monoamine-oxidase-inhibitor antidepressants
- T43.1X1Poisoning by monoamine-oxidase-inhibitor antidepressants, accidental (unintentional)
- T43.1X2Poisoning by monoamine-oxidase-inhibitor antidepressants, intentional self-harm
- T43.1X3Poisoning by monoamine-oxidase-inhibitor antidepressants, assault
- T43.1X4Poisoning by monoamine-oxidase-inhibitor antidepressants, undetermined
- T43.1X5Adverse effect of monoamine-oxidase-inhibitor antidepressants
- T43.1X6Underdosing of monoamine-oxidase-inhibitor antidepressants
- T43.1XPoisoning by, adverse effect of and underdosing of monoamine-oxidase-inhibitor antidepressants
- T43.2Poisoning by, adverse effect of and underdosing of other and unspecified antidepressants
- T43.20Poisoning by, adverse effect of and underdosing of unspecified antidepressants
- T43.201Poisoning by unspecified antidepressants, accidental (unintentional)
- T43.202Poisoning by unspecified antidepressants, intentional self-harm
- T43.203Poisoning by unspecified antidepressants, assault
- T43.204Poisoning by unspecified antidepressants, undetermined
- T43.205Adverse effect of unspecified antidepressants
- T43.206Underdosing of unspecified antidepressants
- T43.21Poisoning by, adverse effect of and underdosing of selective serotonin and norepinephrine reuptake inhibitors
- T43.211Poisoning by selective serotonin and norepinephrine reuptake inhibitors, accidental (unintentional)
- T43.212Poisoning by selective serotonin and norepinephrine reuptake inhibitors, intentional self-harm
- T43.213Poisoning by selective serotonin and norepinephrine reuptake inhibitors, assault
- T43.214Poisoning by selective serotonin and norepinephrine reuptake inhibitors, undetermined
- T43.215Adverse effect of selective serotonin and norepinephrine reuptake inhibitors
- T43.216Underdosing of selective serotonin and norepinephrine reuptake inhibitors
- T43.22Poisoning by, adverse effect of and underdosing of selective serotonin reuptake inhibitors
- T43.221Poisoning by selective serotonin reuptake inhibitors, accidental (unintentional)
- T43.222Poisoning by selective serotonin reuptake inhibitors, intentional self-harm
- T43.223Poisoning by selective serotonin reuptake inhibitors, assault
- T43.224Poisoning by selective serotonin reuptake inhibitors, undetermined
- T43.225Adverse effect of selective serotonin reuptake inhibitors
- T43.226Underdosing of selective serotonin reuptake inhibitors
- T43.29Poisoning by, adverse effect of and underdosing of other antidepressants
- T43.291Poisoning by other antidepressants, accidental (unintentional)
- T43.292Poisoning by other antidepressants, intentional self-harm
- T43.293Poisoning by other antidepressants, assault
- T43.294Poisoning by other antidepressants, undetermined
- T43.295Adverse effect of other antidepressants
- T43.296Underdosing of other antidepressants
- T43.20Poisoning by, adverse effect of and underdosing of unspecified antidepressants
- T43.3Poisoning by, adverse effect of and underdosing of phenothiazine antipsychotics and neuroleptics
- T43.3XPoisoning by, adverse effect of and underdosing of phenothiazine antipsychotics and neuroleptics
- T43.3X1Poisoning by phenothiazine antipsychotics and neuroleptics, accidental (unintentional)
- T43.3X2Poisoning by phenothiazine antipsychotics and neuroleptics, intentional self-harm
- T43.3X3Poisoning by phenothiazine antipsychotics and neuroleptics, assault
- T43.3X4Poisoning by phenothiazine antipsychotics and neuroleptics, undetermined
- T43.3X5Adverse effect of phenothiazine antipsychotics and neuroleptics
- T43.3X6Underdosing of phenothiazine antipsychotics and neuroleptics
- T43.3XPoisoning by, adverse effect of and underdosing of phenothiazine antipsychotics and neuroleptics
- T43.4Poisoning by, adverse effect of and underdosing of butyrophenone and thiothixene neuroleptics
- T43.4XPoisoning by, adverse effect of and underdosing of butyrophenone and thiothixene neuroleptics
- T43.4X1Poisoning by butyrophenone and thiothixene neuroleptics, accidental (unintentional)
- T43.4X2Poisoning by butyrophenone and thiothixene neuroleptics, intentional self-harm
- T43.4X3Poisoning by butyrophenone and thiothixene neuroleptics, assault
- T43.4X4Poisoning by butyrophenone and thiothixene neuroleptics, undetermined
- T43.4X5Adverse effect of butyrophenone and thiothixene neuroleptics
- T43.4X6Underdosing of butyrophenone and thiothixene neuroleptics
- T43.4XPoisoning by, adverse effect of and underdosing of butyrophenone and thiothixene neuroleptics
- T43.5Poisoning by, adverse effect of and underdosing of other and unspecified antipsychotics and neuroleptics
- T43.50Poisoning by, adverse effect of and underdosing of unspecified antipsychotics and neuroleptics
- T43.501Poisoning by unspecified antipsychotics and neuroleptics, accidental (unintentional)
- T43.502Poisoning by unspecified antipsychotics and neuroleptics, intentional self-harm
- T43.503Poisoning by unspecified antipsychotics and neuroleptics, assault
- T43.504Poisoning by unspecified antipsychotics and neuroleptics, undetermined
- T43.505Adverse effect of unspecified antipsychotics and neuroleptics
- T43.506Underdosing of unspecified antipsychotics and neuroleptics
- T43.59Poisoning by, adverse effect of and underdosing of other antipsychotics and neuroleptics
- T43.591Poisoning by other antipsychotics and neuroleptics, accidental (unintentional)
- T43.592Poisoning by other antipsychotics and neuroleptics, intentional self-harm
- T43.593Poisoning by other antipsychotics and neuroleptics, assault
- T43.594Poisoning by other antipsychotics and neuroleptics, undetermined
- T43.595Adverse effect of other antipsychotics and neuroleptics
- T43.596Underdosing of other antipsychotics and neuroleptics
- T43.50Poisoning by, adverse effect of and underdosing of unspecified antipsychotics and neuroleptics
- T43.6Poisoning by, adverse effect of and underdosing of psychostimulants
- T43.60Poisoning by, adverse effect of and underdosing of unspecified psychostimulant
- T43.601Poisoning by unspecified psychostimulants, accidental (unintentional)
- T43.602Poisoning by unspecified psychostimulants, intentional self-harm
- T43.603Poisoning by unspecified psychostimulants, assault
- T43.604Poisoning by unspecified psychostimulants, undetermined
- T43.605Adverse effect of unspecified psychostimulants
- T43.606Underdosing of unspecified psychostimulants
- T43.61Poisoning by, adverse effect of and underdosing of caffeine
- T43.62Poisoning by, adverse effect of and underdosing of amphetamines
- T43.63Poisoning by, adverse effect of and underdosing of methylphenidate
- T43.64Poisoning by ecstasy
- T43.65Poisoning by, adverse effect of and underdosing of methamphetamines
- T43.69Poisoning by, adverse effect of and underdosing of other psychostimulants
- T43.691Poisoning by other psychostimulants, accidental (unintentional)
- T43.692Poisoning by other psychostimulants, intentional self-harm
- T43.693Poisoning by other psychostimulants, assault
- T43.694Poisoning by other psychostimulants, undetermined
- T43.695Adverse effect of other psychostimulants
- T43.696Underdosing of other psychostimulants
- T43.60Poisoning by, adverse effect of and underdosing of unspecified psychostimulant
- T43.8Poisoning by, adverse effect of and underdosing of other psychotropic drugs
- T43.8XPoisoning by, adverse effect of and underdosing of other psychotropic drugs
- T43.8X1Poisoning by other psychotropic drugs, accidental (unintentional)
- T43.8X2Poisoning by other psychotropic drugs, intentional self-harm
- T43.8X3Poisoning by other psychotropic drugs, assault
- T43.8X4Poisoning by other psychotropic drugs, undetermined
- T43.8X5Adverse effect of other psychotropic drugs
- T43.8X6Underdosing of other psychotropic drugs
- T43.8XPoisoning by, adverse effect of and underdosing of other psychotropic drugs
- T43.9Poisoning by, adverse effect of and underdosing of unspecified psychotropic drug
- T43.91Poisoning by unspecified psychotropic drug, accidental (unintentional)
- T43.92Poisoning by unspecified psychotropic drug, intentional self-harm
- T43.93Poisoning by unspecified psychotropic drug, assault
- T43.94Poisoning by unspecified psychotropic drug, undetermined
- T43.95Adverse effect of unspecified psychotropic drug
- T43.96Underdosing of unspecified psychotropic drug
Coding notes
Excludes2Not included here — may be reported together if both conditions exist
Notes that apply from higher levels
Instructions written at a parent level also apply to T43.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about T43
Is T43 billable?
- No. T43 is a header code. Report one of its more specific subcodes instead.