ICD-10-CM 2027 diagnosis code

Y36.A2High level blast overpressure in war operations

Not billable — use a more specific codeRequires 7th character

Y36.A2 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 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 Y36.A2

Y36.A2 is the ICD-10-CM diagnosis code for high level blast overpressure in war operations. It belongs to category Y36 (operations of war), 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 Y36.A (blast overpressure in war operations), Y36.A2 is specifically for high level blast overpressure in war operations. Related codes cover low level blast overpressure in war operations (Y36.A1).

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 Y36

Ainitial encounterY36.A2XA
Dsubsequent encounterY36.A2XD
SsequelaY36.A2XS

Coding notes

Applicable toConditions and synonyms classified to this code

High level blast overpressure due to explosion in war operations
HLB overpressure in war operations

Notes that apply from higher levels

Instructions written at a parent level also apply to Y36.A2.

› From Y36.A Blast overpressure in war operations

Code also

type of explosive, if known
accidental detonation of onboard munitions (Y36.140)
explosion of grenade (Y36.290)
explosion of torpedo (Y36.040)
improvised explosive device (Y36.230)

› From Y36 Operations of war

Includes

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

Excludes1

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)

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

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to Y36.A2.

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 Y36.A2

Is Y36.A2 billable?: No. Y36.A2 is a header code. Report one of its more specific subcodes instead.