T45.91Poisoning by unspecified primarily systemic and hematological agent, accidental (unintentional)

T45.91 is the ICD-10-CM diagnosis code for poisoning by unspecified primarily systemic and hematological agent, accidental (unintentional). It belongs to category T45 (poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, 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 T45.9, choose T45.91 (Poisoning by unspecified primarily systemic and hematological agent, accidental (unintentional)) only when documentation doesn't support a more specific option: poisoning by unspecified primarily systemic and hematological agent, intentional self-harm (T45.92), poisoning by unspecified primarily systemic and hematological agent, assault (T45.93), poisoning by unspecified primarily systemic and hematological agent, undetermined (T45.94), adverse effect of unspecified primarily systemic and hematological agent (T45.95) and underdosing of unspecified primarily systemic and hematological agent (T45.96).

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.