Y99.1 Military activity

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Excludes1 (never code together)

• activity of off duty military personnel (Y99.8)

Applies from Y99 External cause status

Notes

• A 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.

Approximate ICD-9-CM (GEMs)

• E000.1 Military activity

Code annotations containing back-references to Y99.1

Back-references to Y99.1

• Type 1 Excludes: Y99.0 Civilian activity done for income or pay ("military activity (Y99.1)")
• Type 1 Excludes: Y99.8 Other external cause status ("military activity (Y99.1)")

Diagnosis Index entries for Y99.1

• External cause status › military activity
• Status of external cause › military activity

Nearby codes

• Y99 External cause status
• Y99.0 Civilian activity done for income or pay
• Y99.1 Military activity (this code)
• Y99.2 Volunteer activity
• Y99.8 Other external cause status
• Y99.9 Unspecified external cause status