Y36 – Operations of war

ICD-10-CM 2027 diagnosis code · Legal intervention, operations of war, military operations, and terrorism

Non-billable header

ICD-10-CM code Y36

Code: Y36 (claims format: Y36)
Description: Operations of war
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 20. External causes of morbidity (V00-Y99)
Block: Y35-Y38 Legal intervention, operations of war, military operations, and terrorism

Billable codes under Y36

Y36 is a header code and cannot be used on claims. Choose the most specific code:

Y36.0 – War operations involving explosion of marine weaponsHeader (more codes below)
Y36.1 – War operations involving destruction of aircraftHeader (more codes below)
Y36.2 – War operations involving other explosions and fragmentsHeader (more codes below)
Y36.3 – War operations involving fires, conflagrations and hot substancesHeader (more codes below)
Y36.4 – War operations involving firearm discharge and other forms of conventional warfareHeader (more codes below)
Y36.5 – War operations involving nuclear weaponsHeader (more codes below)
Y36.6 – War operations involving biological weaponsHeader (more codes below)
Y36.7 – War operations involving chemical weapons and other forms of unconventional warfareHeader (more codes below)
Y36.8 – War operations occurring after cessation of hostilitiesHeader (more codes below)
Y36.9 – Other and unspecified war operationsHeader (more codes below)
Y36.A – Blast overpressure in war operationsHeader (more codes below)

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes for Y36

Includes:

injuries to military personnel and civilians caused by war, civil insurrection, and peacekeeping missions

Excludes1 (not coded here):

injury to military personnel occurring during peacetime military operations (Y37.-)
military vehicles involved in transport accidents with non-military vehicle during peacetime (V09.01, V09.21, V19.81, V29.818, V39.81, V49.81, V59.81, V69.81, V79.81)

7th character note:

The appropriate 7th character is to be added to each code from category Y36

Frequently asked questions

What is ICD-10 code Y36?

Y36 is the ICD-10-CM code for operations of war, in the block Y35-Y38 (Legal intervention, operations of war, military operations, and terrorism).

Is Y36 a billable code?

No. Y36 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.