ICD-10-CM 2027 diagnosis code
W42.9XXDExposure to other noise, subsequent encounter
W42.9XXD is a valid, billable ICD-10-CM code for exposure to other noise, subsequent 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 W42.9XXD
W42.9XXD is the ICD-10-CM diagnosis code for exposure to other noise, subsequent encounter. It belongs to category W42 (exposure to noise), 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 "D" means subsequent encounter: use it for encounters after active treatment, while the patient is healing or recovering.
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 E928.1 (exposure to noise).
7th character
Dsubsequent encounter
Other encounter types for W42.9:
Notes that apply from higher levels
Instructions written at a parent level also apply to W42.9XXD.
Broader instructions also apply from W20-W49 Exposure to inanimate mechanical forces and Chapter 20: External causes of morbidity.
ICD-9-CM equivalent
Converter →- E928.1Exposure to noiseapproximate
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 W42.9XXD
Is W42.9XXD billable?
- Yes. W42.9XXD is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "D" at the end of W42.9XXD mean?
- It is the 7th character for subsequent encounter. Per the official guidelines, use it for encounters after active treatment, while the patient is healing or recovering.
Can W42.9XXD be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict W42.9XXD as a principal diagnosis.
Is W42.9XXD a CC or MCC?
- No. W42.9XXD is neither a CC nor an MCC under MS-DRG v44.0.
What is the ICD-9 code for W42.9XXD?
- The CMS General Equivalence Mappings map W42.9XXD to ICD-9-CM E928.1.