U.S. ICD-10-CM · FY 2027

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

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

T43

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

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where T43 sits

  1. 1

    Chapter 19

    Injury, poisoning and certain other consequences of external causes (S00-T88)

  2. 2

    Section

    Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)

  3. 3

    Category T43

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

  4. 4

    Code T43

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

More specific choices

Codes under T43

T43 is a non-billable category. Choose the child code that best matches the documented diagnosis.

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

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for T43.

Code first

No “code first” instruction is listed for T43.

Use additional code

No “use additional code” instruction is listed for T43.

Excludes1

Conditions that should not be reported together with this code.

No Excludes1 note is listed for T43.

Excludes2

Conditions not included here that may be reported separately when present.

  • 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.-)
  • methaqualone (T42.6-)
  • psychodysleptics [hallucinogens] (T40.7-T40.9-)

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code T43 mean?

T43 is the FY 2027 U.S. ICD-10-CM code for “Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified.”

Is T43 a billable or specific ICD-10-CM code?

No. T43 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is T43 located in ICD-10-CM?

T43 is listed in Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88), within Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50) (T36–T50), under category T43, Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified.

What coding notes are listed for T43?

No inclusion terms are listed for T43 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: 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.-); methaqualone (T42.6-); psychodysleptics [hallucinogens] (T40.7-T40.9-).

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