2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Exposure to other forces of nature
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to X39: its own notes plus those printed at Chapter 20. A note printed at a category, block or chapter applies to every code under it.

Notes

General instructions on how these codes are used.

From Chapter 20 (V00-Y99) External causes of morbidity and mortality applies to 7,461 codes
  • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

  • The appropriate 7th character is to be added to each code from category X39
Values for category X39 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name X39, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming X39: they are not reported together with it, unless the two conditions are unrelated.

  • Block W85-W99 Exposure to electric current, radiation and extreme ambient air temperature and pressure
    natural radiation NOS (X39)

Excludes2 1

These codes carry an Excludes2 note naming X39: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block W65-W74 Accidental non-transport drowning and submersion
    accidental drowning and submersion due to cataclysm (X34-X39) names X34-X39, which includes this code

Code First 1

These codes say to code first a condition named in the note, and X39 is one of the conditions named.

  • W20 Struck by thrown, projected or falling object
    cataclysm (X34-X39) names X34-X39, which includes this code

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About X39Overview

What is the ICD-10 code for exposure to other forces of nature?

X39 is the ICD-10-CM category for exposure to other forces of nature, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.