ICD-10-CM>V00-Y99>Y90-Y99>Y99Y99External cause statusNon-Billable/Non-SpecificNotesA single code from category Y99 should be used in conjunction with the external cause code(s) assigned to a record to indicate the status of the person at the time the event occurred.CodesY99.0Civilian activity done for income or payY99.1Military activityY99.2Volunteer activityY99.8Other external cause statusY99.9Unspecified external cause status