ICD-10-CM 2027 diagnosis code

Y37.ABlast overpressure in military operations

Not billable — use a more specific codeRequires 7th character

Y37.A is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it and add the required 7th character.

Code last changed in FY2026 (effective October 1, 2025). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Y37.A

Y37.A is the ICD-10-CM diagnosis code for blast overpressure in military operations. 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 2 subcodes must be used instead.

Within Y37 (military operations), Y37.A is specifically for blast overpressure in military operations. Related codes cover involving explosion of marine weapons (Y37.0), involving destruction of aircraft (Y37.1), involving other explosions and fragments (Y37.2), involving fires, conflagrations and hot substances (Y37.3), involving firearm discharge and other forms of conventional warfare (Y37.4), involving nuclear weapons (Y37.5), involving biological weapons (Y37.6), involving chemical weapons and other forms of unconventional warfare (Y37.7) and 1 more.

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 was added in FY2026, effective October 1, 2025.

7th character

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

Ainitial encounter
Dsubsequent encounter
Ssequela

Coding notes

Code alsoTwo codes may be needed; sequencing depends on circumstances

type of explosive, if known
accidental detonation of onboard munitions (Y37.140)
explosion of grenade (Y37.290)
explosion of torpedo (Y37.040)
improvised explosive device (Y37.230)

Notes that apply from higher levels

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

› 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

FY2026 (effective 10/1/2025): Added
No changes since FY2026.

Common questions about Y37.A

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