ICD-10-CM 2027 diagnosis code
Y37.A2High level blast overpressure in military operations
Y37.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 Y37.A2
Y37.A2 is the ICD-10-CM diagnosis code for high level 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 3 subcodes must be used instead.
Within Y37.A (blast overpressure in military operations), Y37.A2 is specifically for high level blast overpressure in military operations. Related codes cover low level blast overpressure in military operations (Y37.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 Y37
Coding notes
- High level blast overpressure due to explosion in military operations
- HLB overpressure in military operations
Notes that apply from higher levels
Instructions written at a parent level also apply to Y37.A2.
› From Y37 Military operations
- injuries to military personnel and civilians occurring during peacetime on military property and during routine military exercises and 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.-)
Broader instructions also apply from Chapter 20: External causes of morbidity.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to Y37.A2.
- Military operations (injuries to military and civilians occuring during peacetime on military property and during routine military exercises and operations) (by) (from) (involving) › blast overpressure › high level (due to explosion)
- Military operations (injuries to military and civilians occuring during peacetime on military property and during routine military exercises and operations) (by) (from) (involving) › HLB overpressure
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.A2
Is Y37.A2 billable?
- No. Y37.A2 is a header code. Report one of its more specific subcodes instead.