ICD-10-CM > V00-Y99 > Y35-Y38 > Y36 > Y36.4 > Y36.47 Y36.47 War operations involving unintentional restriction of air and airway Non-Billable/Non-Specific Codes Y36.470War operations involving unintentional restriction of air and airway, military personnelY36.470A..., initial encounterY36.470D..., subsequent encounterY36.470S..., sequelaY36.471War operations involving unintentional restriction of air and airway, civilianY36.471A..., initial encounterY36.471D..., subsequent encounterY36.471S..., sequela