ICD-10-CM 2027 diagnosis code

Y37.331Military operations involving flamethrower, civilian

Not billable — use a more specific codeRequires 7th character

Y37.331 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Y37.331

Y37.331 is the ICD-10-CM diagnosis code for military operations involving flamethrower, civilian. It belongs to category Y37 (military operations), block Y35-Y38 (legal intervention, operations of war, military operations, and terrorism) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within Y37.33 (military operations involving flamethrower), Y37.331 is specifically for military operations involving flamethrower, civilian. Related codes cover military personnel (Y37.330).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

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

Ainitial encounterY37.331A
Dsubsequent encounterY37.331D
SsequelaY37.331S

Notes that apply from higher levels

Instructions written at a parent level also apply to Y37.331.

› From Y37.3 Military operations involving fires, conflagrations and hot substances

Excludes1

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-)

› 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

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.-)

Broader instructions also apply from Chapter 20: External causes of morbidity.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about Y37.331

Is Y37.331 billable?: No. Y37.331 is a header code. Report one of its more specific subcodes instead.