ICD-10-CM > V00-Y99 > Y35-Y38 > Y36 > Y36.6 Y36.6 War operations involving biological weapons Non-Billable/Non-Specific Codes Y36.6XWar operations involving biological weaponsY36.6X0War operations involving biological weapons, military personnelY36.6X0A..., initial encounterY36.6X0D..., subsequent encounterY36.6X0S..., sequelaY36.6X1War operations involving biological weapons, civilianY36.6X1A..., initial encounterY36.6X1D..., subsequent encounterY36.6X1S..., sequela