2027 ICD-10-CM Diagnosis Code X35Volcanic eruption

ICD-10-CM Codes›V01–Y99›X30-X39›X35

ICD-10-CM X35
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

X35 is a non-billable ICD-10-CM category code for volcanic eruption, so it cannot be submitted on claims. Use a more specific code from this category instead, such as X35.XXXA, X35.XXXD, and X35.XXXS.

Code Identity

ICD-10-CM Code
X35
Billable Status
No — Non-Billable Category
Code Describes
Volcanic eruption
Short Description
Volcanic eruption
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
CategoryX35Volcanic eruption
This CodeX35Volcanic eruption

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to X35: its own notes plus those printed at Chapter 20. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

  • tidal wave (tsunami) due to volcanic eruption (X37.41)

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 code X35
Values for category X35 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 X35, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming X35: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block V00-V99 Transport accidents
    transport accidents due to cataclysm (X34-X38) names X34-X38, which includes this code
  • 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 X35 is one of the conditions named.

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

Use Additional Code 1

These codes say to use an additional code from the note, and X35 is one of the codes named.

  • T71.21 Asphyxiation due to cave-in or falling earth
    code for any associated cataclysm (X34-X38) names X34-X38, which includes this code

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index; each main term links to its index entry.

Patient EducationClinical

Volcanoes

A volcano is a vent in the Earth's crust. Hot rock, steam, poisonous gases, and ash reach the Earth's surface when a volcano erupts. An eruption can also cause earthquakes, mudflows and flash floods, rock falls and landslides, acid rain, fires, and even tsunamis.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

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 X35Overview

What is the ICD-10 code for volcanic eruption?

X35 is the ICD-10-CM category for volcanic eruption, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is X35 (Volcanic eruption) a billable code?

No. This is a category header that groups the codes for volcanic eruption, and headers cannot be submitted on claims. Claims for volcanic eruption need a more specific code from this category, such as X35.XXXA, X35.XXXD, and X35.XXXS.