T45.7X4Poisoning by anticoagulant antagonists, vitamin K and other coagulants, undetermined

T45.7X4 is the ICD-10-CM diagnosis code for poisoning by anticoagulant antagonists, vitamin K and other coagulants, undetermined. 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 T45.7X, choose T45.7X4 (Poisoning by anticoagulant antagonists, vitamin K and other coagulants, undetermined) only when documentation doesn't support a more specific option: poisoning by anticoagulant antagonists, vitamin K and other coagulants, accidental (unintentional) (T45.7X1), poisoning by anticoagulant antagonists, vitamin K and other coagulants, intentional self-harm (T45.7X2), poisoning by anticoagulant antagonists, vitamin K and other coagulants, assault (T45.7X3), adverse effect of anticoagulant antagonists, vitamin K and other coagulants (T45.7X5) and underdosing of anticoagulant antagonist, vitamin K and other coagulants (T45.7X6).

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.