ICD-10-CM > S00-T88 > T36-T50 > T45 > T45.5 > T45.51 > T45.516 T45.516 Underdosing of anticoagulants Non-Billable/Non-Specific Codes T45.516A..., initial encounterT45.516D..., subsequent encounterT45.516S..., sequela