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ICD-10-CM 2027 diagnosis code

W89.0XXAExposure to welding light (arc), initial encounter

✓ Billable / specificPOA exemptRequires 7th character

W89.0XXA is a valid, billable ICD-10-CM code for exposure to welding light (arc), 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 W89.0XXA

W89.0XXA is the ICD-10-CM diagnosis code for exposure to welding light (arc), initial encounter. It belongs to category W89 (exposure to man-made visible and ultraviolet light), 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 E926.2 (exposure to visible and ultraviolet light sources).

7th character

Ainitial encounter

Other encounter types for W89.0:

Notes that apply from higher levels

Instructions written at a parent level also apply to W89.0XXA.

› From W89 Exposure to man-made visible and ultraviolet light
Includes
  • exposure to welding light (arc)
Excludes2
  • exposure to sunlight (X32)

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 →
  • E926.2Exposure to visible and ultraviolet light sourcesapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about W89.0XXA

Is W89.0XXA billable?

Yes. W89.0XXA 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 W89.0XXA 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 W89.0XXA be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict W89.0XXA as a principal diagnosis.

Is W89.0XXA a CC or MCC?

No. W89.0XXA is neither a CC nor an MCC under MS-DRG v44.0.

What is the ICD-9 code for W89.0XXA?

The CMS General Equivalence Mappings map W89.0XXA to ICD-9-CM E926.2.