ICD-10-CM T43: Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified

ICD-10-CM Diagnosis Code (2025)

Official Description for T43

Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified

Coding Notes & Guidelines for T43

Excludes1: Not Coded Here
  • appetite depressants (T50.5-)
  • barbiturates (T42.3-)
  • benzodiazepines (T42.4-)
  • methaqualone (T42.6-)
  • psychodysleptics [hallucinogens] (T40.7-T40.9-)
Excludes1: Not Coded Here

poisoning by, adverse effect of and underdosing of rauwolfia (T46.5-)

Excludes1: Not Coded Here

poisoning by, adverse effect of and underdosing of cocaine (T40.5-)

Excludes2: Not Included Here

drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.- -F19.-)

Inclusion Terms

Poisoning by tricyclic antidepressants NOS

Inclusion Terms

Poisoning by tetracyclic antidepressants NOS

Inclusion Terms

Poisoning by monoamine-oxidase-inhibitor antidepressants NOS

Inclusion Terms

Poisoning by antidepressants NOS

Inclusion Terms

Antidepressant discontinuation syndrome

Inclusion Terms

Poisoning by, adverse effect of and underdosing of SSNRI antidepressants

Inclusion Terms

Poisoning by, adverse effect of and underdosing of SSRI antidepressants

Inclusion Terms

Poisoning by other antidepressants NOS

Inclusion Terms

Poisoning by phenothiazine antipsychotics and neuroleptics NOS

Inclusion Terms

Poisoning by butyrophenone and thiothixene neuroleptics NOS

Inclusion Terms

Poisoning by antipsychotics and neuroleptics NOS

Inclusion Terms

Poisoning by other antipsychotics and neuroleptics NOS

Inclusion Terms

Poisoning by psychostimulants NOS

Inclusion Terms

Poisoning by caffeine NOS

Inclusion Terms

Poisoning by amphetamines NOS

Inclusion Terms

Poisoning by methylphenidate NOS

Inclusion Terms
  • Poisoning by MDMA
  • Poisoning by 3,4-methylenedioxymethamphetamine
Inclusion Terms

Poisoning by ecstasy NOS

Inclusion Terms

Poisoning by methamphetamines NOS

Inclusion Terms

Poisoning by other psychostimulants NOS

Inclusion Terms

Poisoning by other psychotropic drugs NOS

Inclusion Terms

Poisoning by psychotropic drug NOS

7th Character Guidance

The appropriate 7th character is to be added to each code from category T43

7th Character Definitions
  • A: initial encounter
  • D: subsequent encounter
  • S: sequela

Child Codes (More Specific Codes for T43):

T43.0 - Poisoning by, adverse effect of and underdosing of tricyclic and tetracyclic antidepressants T43.01 - Poisoning by, adverse effect of and underdosing of tricyclic antidepressants T43.011 - Poisoning by tricyclic antidepressants, accidental (unintentional) T43.012 - Poisoning by tricyclic antidepressants, intentional self-harm T43.013 - Poisoning by tricyclic antidepressants, assault T43.014 - Poisoning by tricyclic antidepressants, undetermined T43.015 - Adverse effect of tricyclic antidepressants T43.016 - Underdosing of tricyclic antidepressants T43.02 - Poisoning by, adverse effect of and underdosing of tetracyclic antidepressants T43.021 - Poisoning by tetracyclic antidepressants, accidental (unintentional) T43.022 - Poisoning by tetracyclic antidepressants, intentional self-harm T43.023 - Poisoning by tetracyclic antidepressants, assault T43.024 - Poisoning by tetracyclic antidepressants, undetermined T43.025 - Adverse effect of tetracyclic antidepressants T43.026 - Underdosing of tetracyclic antidepressants T43.1 - Poisoning by, adverse effect of and underdosing of monoamine-oxidase-inhibitor antidepressants T43.1X - Poisoning by, adverse effect of and underdosing of monoamine-oxidase-inhibitor antidepressants T43.1X1 - Poisoning by monoamine-oxidase-inhibitor antidepressants, accidental (unintentional) T43.1X2 - Poisoning by monoamine-oxidase-inhibitor antidepressants, intentional self-harm T43.1X3 - Poisoning by monoamine-oxidase-inhibitor antidepressants, assault T43.1X4 - Poisoning by monoamine-oxidase-inhibitor antidepressants, undetermined T43.1X5 - Adverse effect of monoamine-oxidase-inhibitor antidepressants T43.1X6 - Underdosing of monoamine-oxidase-inhibitor antidepressants T43.2 - Poisoning by, adverse effect of and underdosing of other and unspecified antidepressants T43.20 - Poisoning by, adverse effect of and underdosing of unspecified antidepressants T43.201 - Poisoning by unspecified antidepressants, accidental (unintentional) T43.202 - Poisoning by unspecified antidepressants, intentional self-harm T43.203 - Poisoning by unspecified antidepressants, assault T43.204 - Poisoning by unspecified antidepressants, undetermined T43.205 - Adverse effect of unspecified antidepressants T43.206 - Underdosing of unspecified antidepressants T43.21 - Poisoning by, adverse effect of and underdosing of selective serotonin and norepinephrine reuptake inhibitors T43.211 - Poisoning by selective serotonin and norepinephrine reuptake inhibitors, accidental (unintentional) T43.212 - Poisoning by selective serotonin and norepinephrine reuptake inhibitors, intentional self-harm T43.213 - Poisoning by selective serotonin and norepinephrine reuptake inhibitors, assault T43.214 - Poisoning by selective serotonin and norepinephrine reuptake inhibitors, undetermined T43.215 - Adverse effect of selective serotonin and norepinephrine reuptake inhibitors T43.216 - Underdosing of selective serotonin and norepinephrine reuptake inhibitors T43.22 - Poisoning by, adverse effect of and underdosing of selective serotonin reuptake inhibitors T43.221 - Poisoning by selective serotonin reuptake inhibitors, accidental (unintentional) T43.222 - Poisoning by selective serotonin reuptake inhibitors, intentional self-harm T43.223 - Poisoning by selective serotonin reuptake inhibitors, assault T43.224 - Poisoning by selective serotonin reuptake inhibitors, undetermined T43.225 - Adverse effect of selective serotonin reuptake inhibitors T43.226 - Underdosing of selective serotonin reuptake inhibitors T43.29 - Poisoning by, adverse effect of and underdosing of other antidepressants T43.291 - Poisoning by other antidepressants, accidental (unintentional) T43.292 - Poisoning by other antidepressants, intentional self-harm T43.293 - Poisoning by other antidepressants, assault T43.294 - Poisoning by other antidepressants, undetermined T43.295 - Adverse effect of other antidepressants T43.296 - Underdosing of other antidepressants T43.3 - Poisoning by, adverse effect of and underdosing of phenothiazine antipsychotics and neuroleptics T43.3X - Poisoning by, adverse effect of and underdosing of phenothiazine antipsychotics and neuroleptics T43.3X1 - Poisoning by phenothiazine antipsychotics and neuroleptics, accidental (unintentional) T43.3X2 - Poisoning by phenothiazine antipsychotics and neuroleptics, intentional self-harm T43.3X3 - Poisoning by phenothiazine antipsychotics and neuroleptics, assault T43.3X4 - Poisoning by phenothiazine antipsychotics and neuroleptics, undetermined T43.3X5 - Adverse effect of phenothiazine antipsychotics and neuroleptics T43.3X6 - Underdosing of phenothiazine antipsychotics and neuroleptics T43.4 - Poisoning by, adverse effect of and underdosing of butyrophenone and thiothixene neuroleptics T43.4X - Poisoning by, adverse effect of and underdosing of butyrophenone and thiothixene neuroleptics T43.4X1 - Poisoning by butyrophenone and thiothixene neuroleptics, accidental (unintentional) T43.4X2 - Poisoning by butyrophenone and thiothixene neuroleptics, intentional self-harm T43.4X3 - Poisoning by butyrophenone and thiothixene neuroleptics, assault T43.4X4 - Poisoning by butyrophenone and thiothixene neuroleptics, undetermined T43.4X5 - Adverse effect of butyrophenone and thiothixene neuroleptics T43.4X6 - Underdosing of butyrophenone and thiothixene neuroleptics T43.5 - Poisoning by, adverse effect of and underdosing of other and unspecified antipsychotics and neuroleptics T43.50 - Poisoning by, adverse effect of and underdosing of unspecified antipsychotics and neuroleptics T43.501 - Poisoning by unspecified antipsychotics and neuroleptics, accidental (unintentional) T43.502 - Poisoning by unspecified antipsychotics and neuroleptics, intentional self-harm T43.503 - Poisoning by unspecified antipsychotics and neuroleptics, assault T43.504 - Poisoning by unspecified antipsychotics and neuroleptics, undetermined T43.505 - Adverse effect of unspecified antipsychotics and neuroleptics T43.506 - Underdosing of unspecified antipsychotics and neuroleptics T43.59 - Poisoning by, adverse effect of and underdosing of other antipsychotics and neuroleptics T43.591 - Poisoning by other antipsychotics and neuroleptics, accidental (unintentional) T43.592 - Poisoning by other antipsychotics and neuroleptics, intentional self-harm T43.593 - Poisoning by other antipsychotics and neuroleptics, assault T43.594 - Poisoning by other antipsychotics and neuroleptics, undetermined T43.595 - Adverse effect of other antipsychotics and neuroleptics T43.596 - Underdosing of other antipsychotics and neuroleptics T43.6 - Poisoning by, adverse effect of and underdosing of psychostimulants T43.60 - Poisoning by, adverse effect of and underdosing of unspecified psychostimulant T43.601 - Poisoning by unspecified psychostimulants, accidental (unintentional) T43.602 - Poisoning by unspecified psychostimulants, intentional self-harm T43.603 - Poisoning by unspecified psychostimulants, assault T43.604 - Poisoning by unspecified psychostimulants, undetermined T43.605 - Adverse effect of unspecified psychostimulants T43.606 - Underdosing of unspecified psychostimulants T43.61 - Poisoning by, adverse effect of and underdosing of caffeine T43.611 - Poisoning by caffeine, accidental (unintentional) T43.612 - Poisoning by caffeine, intentional self-harm T43.613 - Poisoning by caffeine, assault T43.614 - Poisoning by caffeine, undetermined T43.615 - Adverse effect of caffeine T43.616 - Underdosing of caffeine T43.62 - Poisoning by, adverse effect of and underdosing of amphetamines T43.621 - Poisoning by amphetamines, accidental (unintentional) T43.622 - Poisoning by amphetamines, intentional self-harm T43.623 - Poisoning by amphetamines, assault T43.624 - Poisoning by amphetamines, undetermined T43.625 - Adverse effect of amphetamines T43.626 - Underdosing of amphetamines T43.63 - Poisoning by, adverse effect of and underdosing of methylphenidate T43.631 - Poisoning by methylphenidate, accidental (unintentional) T43.632 - Poisoning by methylphenidate, intentional self-harm T43.633 - Poisoning by methylphenidate, assault T43.634 - Poisoning by methylphenidate, undetermined T43.635 - Adverse effect of methylphenidate T43.636 - Underdosing of methylphenidate T43.64 - Poisoning by ecstasy T43.641 - Poisoning by ecstasy, accidental (unintentional) T43.642 - Poisoning by ecstasy, intentional self-harm T43.643 - Poisoning by ecstasy, assault T43.644 - Poisoning by ecstasy, undetermined T43.65 - Poisoning by, adverse effect of and underdosing of methamphetamines T43.651 - Poisoning by methamphetamines accidental (unintentional) T43.652 - Poisoning by methamphetamines intentional self-harm T43.653 - Poisoning by methamphetamines, assault T43.654 - Poisoning by methamphetamines, undetermined T43.655 - Adverse effect of methamphetamines T43.656 - Underdosing of methamphetamines T43.69 - Poisoning by, adverse effect of and underdosing of other psychostimulants T43.691 - Poisoning by other psychostimulants, accidental (unintentional) T43.692 - Poisoning by other psychostimulants, intentional self-harm T43.693 - Poisoning by other psychostimulants, assault T43.694 - Poisoning by other psychostimulants, undetermined T43.695 - Adverse effect of other psychostimulants T43.696 - Underdosing of other psychostimulants T43.8 - Poisoning by, adverse effect of and underdosing of other psychotropic drugs T43.8X - Poisoning by, adverse effect of and underdosing of other psychotropic drugs T43.8X1 - Poisoning by other psychotropic drugs, accidental (unintentional) T43.8X2 - Poisoning by other psychotropic drugs, intentional self-harm T43.8X3 - Poisoning by other psychotropic drugs, assault T43.8X4 - Poisoning by other psychotropic drugs, undetermined T43.8X5 - Adverse effect of other psychotropic drugs T43.8X6 - Underdosing of other psychotropic drugs T43.9 - Poisoning by, adverse effect of and underdosing of unspecified psychotropic drug T43.91 - Poisoning by unspecified psychotropic drug, accidental (unintentional) T43.92 - Poisoning by unspecified psychotropic drug, intentional self-harm T43.93 - Poisoning by unspecified psychotropic drug, assault T43.94 - Poisoning by unspecified psychotropic drug, undetermined T43.95 - Adverse effect of unspecified psychotropic drug T43.96 - Underdosing of unspecified psychotropic drug

About ICD-10-CM Code T43 (Poisoning by)

ICD-10-CM code T43 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM T43 became effective on October 1, 2024.

This page provides detailed information about T43 - Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Poisoning by related to adverse effect of and underdosing of psychotropic drugs, not elsewhere classified.