ICD-10-CM 2027 diagnosis code
W39.XXXADischarge of firework, initial encounter
W39.XXXA is a valid, billable ICD-10-CM code for discharge of firework, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
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 W39.XXXA
W39.XXXA is the ICD-10-CM diagnosis code for discharge of firework, initial encounter. It belongs to category W39 (discharge of firework), block W20-W49 (exposure to inanimate mechanical forces) 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 E923.0 (accident caused by fireworks).
7th character
Ainitial encounter
Other encounter types for W39:
Notes that apply from higher levels
Instructions written at a parent level also apply to W39.XXXA.
Broader instructions also apply from W20-W49 Exposure to inanimate mechanical forces and Chapter 20: External causes of morbidity.
ICD-9-CM equivalent
Converter →- E923.0Accident caused by fireworksapproximate
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 W39.XXXA
Is W39.XXXA billable?
- Yes. W39.XXXA 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 W39.XXXA 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 W39.XXXA be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict W39.XXXA as a principal diagnosis.
Is W39.XXXA a CC or MCC?
- No. W39.XXXA is neither a CC nor an MCC under MS-DRG v44.0.
What is the ICD-9 code for W39.XXXA?
- The CMS General Equivalence Mappings map W39.XXXA to ICD-9-CM E923.0.