ICD-10-CM 2027 diagnosis code
Y37.490AMilitary operations involving other forms of conventional warfare, military personnel, initial encounter
Y37.490A is a valid, billable ICD-10-CM code for military operations involving other forms of conventional warfare, military personnel, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Milt op involving oth conventional warfare, milt, init
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 Y37.490A
Y37.490A is the ICD-10-CM diagnosis code for military operations involving other forms of conventional warfare, military personnel, initial encounter. 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 billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as E995.8 (injury due to war operations by other forms of conventional warfare) and E995.9 (injury due to war operations by unspecified form of conventional warfare).
7th character
Ainitial encounter
Other encounter types for Y37.490:
Notes that apply from higher levels
Instructions written at a parent level also apply to Y37.490A.
› 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.
ICD-9-CM equivalent
Converter →- E995.8Injury due to war operations by other forms of conventional warfareapproximate
- E995.9Injury due to war operations by unspecified form of conventional warfareapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
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 Y37.490A
Is Y37.490A billable?
- Yes. Y37.490A is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "A" at the end of Y37.490A mean?
- It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.
Can Y37.490A be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Y37.490A as a principal diagnosis.
Is Y37.490A a CC or MCC?
- No. Y37.490A is neither a CC nor an MCC under MS-DRG v44.0.
What is the ICD-9 code for Y37.490A?
- The CMS General Equivalence Mappings map Y37.490A to ICD-9-CM E995.8 and E995.9.