ICD-10-CM > S00-T88 > T36-T50 > T50 > T50.9 > T50.99 > T50.996 T50.996 Underdosing of other drugs, medicaments and biological substances Non-Billable/Non-Specific Codes T50.996A..., initial encounterT50.996D..., subsequent encounterT50.996S..., sequela