Y37.3

Military operations involving fires, conflagrations and hot substances

FY2027Chapter 20: External causes of morbidity/Y35–Y38 Legal intervention, operations of war, military operations, and terrorism

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

7th character required
Excludes1

Y37.3 is a non-billable ICD-10-CM code header for military operations involving fires, conflagrations and hot substances. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are Y37.30 Military operations involving unspecified fire, conflagration and hot substance; Y37.31 Military operations involving gasoline bomb; Y37.32 Military operations involving incendiary bullet; Y37.33 Military operations involving flamethrower and 1 more. Its coding notes include 8 Excludes1 entries.

7th characters

Every code below needs one of these (defined at Y37).

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

Ainitial encounter
Dsubsequent encounter
Ssequela

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

An external cause code is never a principal or first-listed diagnosis. Its 7th character is assigned for each encounter and should match the injury or condition code.

Guidelines I.C.20.a.2; I.C.20.a.6External cause codesRead the official text

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This code

military operations involving fires and conflagrations aboard military aircraft (Y37.1-)
military operations involving fires and conflagrations aboard military watercraft (Y37.0-)
military operations involving fires and conflagrations caused indirectly by conventional weapons (Y37.2-)
military operations involving fires and thermal effects of nuclear weapons (Y36.53-)

Inherited from Y37 Military operations

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.-)

Includes

Further defines or gives examples of the content of the category.

Inherited from Y37 Military operations

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

Inclusion terms

Conditions classified to this code.

This code

Military operations involving smoke, fumes, and heat from fires, conflagrations and hot substances

Notes

Also from chapter/block level (1 note)

Inherited from Chapter 20 External causes of morbidity

This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.

More specific codes under Y37.3 5