ICD-10-CM > S00-T88 > T36-T50 > T44 > T44.9 > T44.99 > T44.994 T44.994 Poisoning by other drug primarily affecting the autonomic nervous system, undetermined Non-Billable/Non-Specific Codes T44.994A..., initial encounterT44.994D..., subsequent encounterT44.994S..., sequela