ICD-10-CM > S00-T88 > T36-T50 > T44 > T44.9 > T44.99 > T44.991 T44.991 Poisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional) Non-Billable/Non-Specific Applicable To Poisoning by other drugs primarily affecting the autonomic nervous system NOS Codes T44.991A..., initial encounterT44.991D..., subsequent encounterT44.991S..., sequela