ICD-10-CM > S00-T88 > T36-T50 > T47 > T47.9 > T47.91 T47.91 Poisoning by unspecified agents primarily affecting the gastrointestinal system, accidental (unintentional) Non-Billable/Non-Specific Applicable To Poisoning by agents primarily affecting the gastrointestinal system NOS Codes T47.91XA..., initial encounterT47.91XD..., subsequent encounterT47.91XS..., sequela