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ICD-10-CM 2027 diagnosis code

W88Exposure to ionizing radiation

Not billable — use a more specific code

W88 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

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 W88

W88 is the ICD-10-CM diagnosis code for exposure to ionizing radiation. It belongs to block W85-W99 (exposure to electric current, radiation and extreme ambient air temperature and pressure) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: W88.0 (x-rays), W88.1 (isotopes) and W88.8 (radiation).

Don't report W88 together with the conditions in its Excludes1 note: exposure to sunlight (X32).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under W88

Coding notes

Excludes1Not coded here — never report together with this code
  • exposure to sunlight (X32)

Notes that apply from higher levels

Instructions written at a parent level also apply to W88.

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.

Codes whose notes reference W88

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 W88

Is W88 billable?

No. W88 is a header code. Report one of its more specific subcodes instead.