ICD-10-CM > V00-Y99 > Y35-Y38 > Y36 > Y36.9 Y36.9 Other and unspecified war operations Non-Billable/Non-Specific Codes Y36.90War operations, unspecifiedY36.90XA..., initial encounterY36.90XD..., subsequent encounterY36.90XS..., sequelaY36.91War operations involving unspecified weapon of mass destruction [WMD]Y36.91XA..., initial encounterY36.91XD..., subsequent encounterY36.91XS..., sequelaY36.92War operations involving friendly fireY36.92XA..., initial encounterY36.92XD..., subsequent encounterY36.92XS..., sequela