ICD-10-CM > V00-Y99 > Y35-Y38 > Y37 > Y37.4 > Y37.47 Y37.47 Military operations involving unintentional restriction of air and airway Non-Billable/Non-Specific Codes Y37.470Military operations involving unintentional restriction of air and airway, military personnelY37.470A..., initial encounterY37.470D..., subsequent encounterY37.470S..., sequelaY37.471Military operations involving unintentional restriction of air and airway, civilianY37.471A..., initial encounterY37.471D..., subsequent encounterY37.471S..., sequela