2026 ICD-10-CM Diagnosis Code X39Exposure to other forces of nature

ICD-10-CM Codes›V01–Y99›X30-X39›X39

ICD-10-CM X39
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

X39 is a non-billable ICD-10-CM category code for exposure to other forces of nature, so it cannot be submitted on claims. Use a more specific code from this category instead, such as X39.01XA, X39.01XD, X39.01XS, and X39.08XA.

Code Identity

ICD-10-CM Code
X39
Billable Status
No — Non-Billable Category
Code Describes
Exposure to other forces of nature
Chapter
X30-X39
Exposure to forces of nature

Code Classification

ChapterV01–Y99External causes of morbidity and mortality
SectionX30-X39Exposure to forces of nature
CategoryX39Exposure to other forces of nature
This CodeX39Exposure to other forces of nature

Specific Coding for Exposure to other forces of natureOverview

Non-specific codes like X39 require more characters. Use one of these billable codes instead:

  • X39.0 for Exposure to natural radiation

  • X39.01 for Exposure to radon

  • X39.08 for Exposure to other natural radiation

  • X39.8 for Other exposure to forces of nature

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

7th Character Note

  • The appropriate 7th character is to be added to each code from category X39

7th Character

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About X39Overview

Is X39 (Exposure to other forces of nature) a billable code?

No. This is a category header that groups the codes for exposure to other forces of nature, and headers cannot be submitted on claims. Claims for exposure to other forces of nature need a more specific code from this category, such as X39.01XA, X39.01XD, and X39.01XS.