ICD-10-CM > V00-Y99 > Y35-Y38 > Y36 > Y36.7 Y36.7 War operations involving chemical weapons and other forms of unconventional warfare Non-Billable/Non-Specific Type 1 Excludes war operations involving incendiary devices (Y36.3-, Y36.5-) Codes Y36.7XWar operations involving chemical weapons and other forms of unconventional warfareY36.7X0War operations involving chemical weapons and other forms of unconventional warfare, military personnelY36.7X0A..., initial encounterY36.7X0D..., subsequent encounterY36.7X0S..., sequelaY36.7X1War operations involving chemical weapons and other forms of unconventional warfare, civilianY36.7X1A..., initial encounterY36.7X1D..., subsequent encounterY36.7X1S..., sequela