T43.656Underdosing of methamphetamines

T43.656 is the ICD-10-CM diagnosis code for underdosing of methamphetamines. 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 T43.65 (poisoning by, adverse effect of and underdosing of methamphetamines), T43.656 is specifically for underdosing of methamphetamines. Related codes cover poisoning by methamphetamines accidental (unintentional) (T43.651), poisoning by methamphetamines intentional self-harm (T43.652), poisoning by methamphetamines, assault (T43.653), poisoning by methamphetamines, undetermined (T43.654) and adverse effect of methamphetamines (T43.655).

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 was added in FY2023, effective October 1, 2022.