ICD-10-CM > S00-T88 > T36-T50 > T50 > T50.9 > T50.91 > T50.916 T50.916 Underdosing of multiple unspecified drugs, medicaments and biological substances Non-Billable/Non-Specific Codes T50.916A..., initial encounterT50.916D..., subsequent encounterT50.916S..., sequela