ICD-10-CM > S00-T88 > T36-T50 > T45 > T45.2 > T45.2X > T45.2X6 T45.2X6 Underdosing of vitamins Non-Billable/Non-Specific Type 1 Excludes vitamin deficiencies (E50-E56) Codes T45.2X6A..., initial encounterT45.2X6D..., subsequent encounterT45.2X6S..., sequela