T46.5Poisoning by, adverse effect of and underdosing of other antihypertensive drugs

T46.5 is the ICD-10-CM diagnosis code for poisoning by, adverse effect of and underdosing of other antihypertensive drugs. It belongs to category T46 (poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular system), 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 1 subcodes must be used instead.

Within T46, choose T46.5 (other antihypertensive drugs) only when documentation doesn't support a more specific option: cardiac-stimulant glycosides and drugs of similar action (T46.0), calcium-channel blockers (T46.1), other antidysrhythmic drugs, not elsewhere classified (T46.2), coronary vasodilators (T46.3), angiotensin-converting-enzyme inhibitors (T46.4), antihyperlipidemic and antiarteriosclerotic drugs (T46.6), peripheral vasodilators (T46.7), antivaricose drugs, including sclerosing agents (T46.8) and 1 more.

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.

The conditions in its Excludes2 note aren't part of T46.5, but may be coded alongside it if the patient has both: poisoning by, adverse effect of and underdosing of beta-adrenoreceptor antagonists (T44.7), poisoning by, adverse effect of and underdosing of calcium-channel blockers (T46.1) and poisoning by, adverse effect of and underdosing of diuretics (T50.0-T50.2).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.