T44.99Poisoning by, adverse effect of and underdosing of other drugs primarily affecting the autonomic nervous system

T44.99 is the ICD-10-CM diagnosis code for poisoning by, adverse effect of and underdosing of other drugs primarily affecting the autonomic nervous system. 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 6 subcodes must be used instead.

Within T44.9, choose T44.99 (other drugs primarily affecting the autonomic nervous system) only when documentation doesn't support a more specific option: unspecified drugs primarily affecting the autonomic nervous system (T44.90).

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.