ICD-10-CM 2027 diagnosis code
Y23.9XXAUnspecified larger firearm discharge, undetermined intent, initial encounter
Y23.9XXA is a valid, billable ICD-10-CM code for unspecified larger firearm discharge, undetermined intent, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Unsp larger firearm discharge, undetermined intent, 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 Y23.9XXA
Y23.9XXA is the ICD-10-CM diagnosis code for unspecified larger firearm discharge, undetermined intent, initial encounter. It belongs to category Y23 (rifle, shotgun and larger firearm discharge, undetermined intent), block Y21-Y33 (event of undetermined intent) 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 E985.4 (injury by other and unspecified firearm, undetermined whether accidentally or purposely inflicted).
7th character
Ainitial encounter
Other encounter types for Y23.9:
Notes that apply from higher levels
Instructions written at a parent level also apply to Y23.9XXA.
› From Y23 Rifle, shotgun and larger firearm discharge, undetermined intent
- airgun (Y24.0)
Broader instructions also apply from Y21-Y33 Event of undetermined intent and Chapter 20: External causes of morbidity.
ICD-9-CM equivalent
Converter →- E985.4Injury by other and unspecified firearm, undetermined whether accidentally or purposely inflictedapproximate
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 Y23.9XXA
Is Y23.9XXA billable?
- Yes. Y23.9XXA 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 Y23.9XXA 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 Y23.9XXA be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Y23.9XXA as a principal diagnosis.
Is Y23.9XXA a CC or MCC?
- No. Y23.9XXA is neither a CC nor an MCC under MS-DRG v44.0.
What is the ICD-9 code for Y23.9XXA?
- The CMS General Equivalence Mappings map Y23.9XXA to ICD-9-CM E985.4.