ICD-10-CM > S00-T88 > T36-T50 > T50 > T50.B > T50.B1 > T50.B16 T50.B16 Underdosing of smallpox vaccines Non-Billable/Non-Specific Codes T50.B16A..., initial encounterT50.B16D..., subsequent encounterT50.B16S..., sequela