ICD-10-CM 2027 diagnosis code
W94.31XAExposure to sudden change in air pressure in aircraft during descent, initial encounter
W94.31XA is a valid, billable ICD-10-CM code for exposure to sudden change in air pressure in aircraft during descent, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Expsr to chng in air pressure in arcrft during descent, 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 W94.31XA
W94.31XA is the ICD-10-CM diagnosis code for exposure to sudden change in air pressure in aircraft during descent, initial encounter. It belongs to category W94 (exposure to high and low air pressure and changes in air pressure), block W85-W99 (exposure to electric current, radiation and extreme ambient air temperature and pressure) 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 E902.1 (accident due to changes in air pressure in aircraft).
7th character
Ainitial encounter
Other encounter types for W94.31:
Notes that apply from higher levels
Instructions written at a parent level also apply to W94.31XA.
Broader instructions also apply from W85-W99 Exposure to electric current, radiation and extreme ambient air temperature and pressure and Chapter 20: External causes of morbidity.
ICD-9-CM equivalent
Converter →- E902.1Accident due to changes in air pressure in aircraftapproximate
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 W94.31XA
Is W94.31XA billable?
- Yes. W94.31XA 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 W94.31XA 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 W94.31XA be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict W94.31XA as a principal diagnosis.
Is W94.31XA a CC or MCC?
- No. W94.31XA is neither a CC nor an MCC under MS-DRG v44.0.
What is the ICD-9 code for W94.31XA?
- The CMS General Equivalence Mappings map W94.31XA to ICD-9-CM E902.1.