T43.9Poisoning by, adverse effect of and underdosing of unspecified psychotropic drug

T43.9 is the ICD-10-CM diagnosis code for poisoning by, adverse effect of and underdosing of unspecified psychotropic drug. It belongs to category T43 (poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified), 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 6 subcodes must be used instead.

Within T43, choose T43.9 (unspecified psychotropic drug) only when documentation doesn't support a more specific option: tricyclic and tetracyclic antidepressants (T43.0), monoamine-oxidase-inhibitor antidepressants (T43.1), other and unspecified antidepressants (T43.2), phenothiazine antipsychotics and neuroleptics (T43.3), butyrophenone and thiothixene neuroleptics (T43.4), other and unspecified antipsychotics and neuroleptics (T43.5), psychostimulants (T43.6) and other psychotropic drugs (T43.8).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.