T43.3X6Underdosing of phenothiazine antipsychotics and neuroleptics

T43.3X6 is the ICD-10-CM diagnosis code for underdosing of phenothiazine antipsychotics and neuroleptics. 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 3 subcodes must be used instead.

Within T43.3X (poisoning by, adverse effect of and underdosing of phenothiazine antipsychotics and neuroleptics), T43.3X6 is specifically for underdosing of phenothiazine antipsychotics and neuroleptics. Related codes cover poisoning by phenothiazine antipsychotics and neuroleptics, accidental (unintentional) (T43.3X1), poisoning by phenothiazine antipsychotics and neuroleptics, intentional self-harm (T43.3X2), poisoning by phenothiazine antipsychotics and neuroleptics, assault (T43.3X3), poisoning by phenothiazine antipsychotics and neuroleptics, undetermined (T43.3X4) and adverse effect of phenothiazine antipsychotics and neuroleptics (T43.3X5).

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.