ICD-10-CM 2027 diagnosis code

X39Exposure to other forces of nature

Not billable — use a more specific code

X39 is a header code, so it can't be reported by itself. Choose one of the 2 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 X39

X39 is the ICD-10-CM diagnosis code for exposure to other forces of nature. It belongs to block X30-X39 (exposure to forces of nature) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: X39.0 (radiation) and X39.8 (nature).

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 X39

Notes that apply from higher levels

Instructions written at a parent level also apply to X39.

Broader instructions also apply from Chapter 20: External causes of morbidity.

Codes whose notes reference X39

W20Code first

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 X39

Is X39 billable?: No. X39 is a header code. Report one of its more specific subcodes instead.