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