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