T44.8Poisoning by, adverse effect of and underdosing of centrally-acting and adrenergic-neuron- blocking agents

T44.8 is the ICD-10-CM diagnosis code for poisoning by, adverse effect of and underdosing of centrally-acting and adrenergic-neuron- blocking agents. It belongs to category T44 (poisoning by, adverse effect of and underdosing of drugs primarily affecting the autonomic nervous 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 T44 (poisoning by, adverse effect of and underdosing of drugs primarily affecting the autonomic nervous system), T44.8 is specifically for poisoning by, adverse effect of and underdosing of centrally-acting and adrenergic-neuron- blocking agents. Related codes cover anticholinesterase agents (T44.0), other parasympathomimetics [cholinergics] (T44.1), ganglionic blocking drugs (T44.2), other parasympatholytics [anticholinergics and antimuscarinics] and spasmolytics (T44.3), predominantly alpha-adrenoreceptor agonists (T44.4), predominantly beta-adrenoreceptor agonists (T44.5), alpha-adrenoreceptor antagonists (T44.6), beta-adrenoreceptor antagonists (T44.7) 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 T44.8, but may be coded alongside it if the patient has both: poisoning by, adverse effect of and underdosing of clonidine (T46.5) and poisoning by, adverse effect of and underdosing of guanethidine (T46.5).

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