Y37.491A Military operations involving other forms of conventional warfare, civilian, initial encounter

Billable ICD-10-CM code, FY2026.

Built from Y37.491 with 7th character A (initial encounter).

Applies from Y37 Military operations

Includes

• injuries to military personnel and civilians occurring during peacetime on military property and during routine military exercises and operations

Excludes1 (never code together)

• military aircraft involved in aircraft accident with civilian aircraft (V97.81-)
• military vehicles involved in transport accident with civilian vehicle (V09.01, V09.21, V19.81, V29.818, V39.81, V49.81, V59.81, V69.81, V79.81)
• military watercraft involved in water transport accident with civilian watercraft (V94.81-)
• war operations (Y36.-)

7th character note

• The appropriate 7th character is to be added to each code from category Y37

7th character required

• A — initial encounter
• D — subsequent encounter
• S — sequela

Code annotations containing back-references to Y37.491A

Back-references to Y37

• Type 1 Excludes: V91 Other injury due to accident to watercraft ("military watercraft accident in military or war operations (Y36, Y37.-)")
• Type 1 Excludes: V92 Drowning and submersion due to accident on board watercraft, without accident to watercraft ("military watercraft accident in military or war operations (Y36, Y37)")
• Type 1 Excludes: V93 Other injury due to accident on board watercraft, without accident to watercraft ("military watercraft accident in military or war operations (Y36, Y37.-)")
• Type 1 Excludes: V94 Other and unspecified water transport accidents ("military watercraft accidents in military or war operations (Y36, Y37)")
• Type 1 Excludes: W49 Exposure to other inanimate mechanical forces ("exposure to inanimate mechanical forces involving military or war operations (Y36.-, Y37.-)")
• Type 1 Excludes: Y36 Operations of war ("injury to military personnel occurring during peacetime military operations (Y37.-)")

Nearby codes

• Y37.490 Military operations involving other forms of conventional warfare, military personnel
• Y37.490A Military operations involving other forms of conventional warfare, military personnel, initial encounter
• Y37.490D Military operations involving other forms of conventional warfare, military personnel, subsequent encounter
• Y37.490S Military operations involving other forms of conventional warfare, military personnel, sequela
• Y37.491 Military operations involving other forms of conventional warfare, civilian
• Y37.491A Military operations involving other forms of conventional warfare, civilian, initial encounter (this code)
• Y37.491D Military operations involving other forms of conventional warfare, civilian, subsequent encounter
• Y37.491S Military operations involving other forms of conventional warfare, civilian, sequela
• Y37.5 Military operations involving nuclear weapons
• Y37.50 Military operations involving unspecified effect of nuclear weapon
• Y37.500 Military operations involving unspecified effect of nuclear weapon, military personnel