ICD-10-CM > S00-T88 > T36-T50 > T48 > T48.1 > T48.1X > T48.1X4 T48.1X4 Poisoning by skeletal muscle relaxants [neuromuscular blocking agents], undetermined Non-Billable/Non-Specific Codes T48.1X4A..., initial encounterT48.1X4D..., subsequent encounterT48.1X4S..., sequela