ICD-10-CM > S00-T88 > T36-T50 > T41 > T41.5 > T41.5X > T41.5X4 T41.5X4 Poisoning by therapeutic gases, undetermined Non-Billable/Non-Specific Codes T41.5X4A..., initial encounterT41.5X4D..., subsequent encounterT41.5X4S..., sequela