T40.49Poisoning by, adverse effect of and underdosing of other synthetic narcotics

T40.49 is the ICD-10-CM diagnosis code for poisoning by, adverse effect of and underdosing of other synthetic narcotics. It belongs to category T40 (poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]), 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 T40.4, choose T40.49 (other synthetic narcotics) only when documentation doesn't support a more specific option: fentanyl or fentanyl analogs (T40.41) and tramadol (T40.42).

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 FY2021, effective October 1, 2020.