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ICD-10-CM 2027 diagnosis code

X35.XXXDVolcanic eruption, subsequent encounter

✓ Billable / specificPOA exemptRequires 7th character

X35.XXXD is a valid, billable ICD-10-CM code for volcanic eruption, subsequent encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 X35.XXXD

X35.XXXD is the ICD-10-CM diagnosis code for volcanic eruption, subsequent encounter. It belongs to category X35 (volcanic eruption), block X30-X39 (exposure to forces of nature) and chapter 20 (external causes of morbidity). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "D" means subsequent encounter: use it for encounters after active treatment, while the patient is healing or recovering.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

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

Before ICD-10, this condition was coded in ICD-9-CM as E909.1 (volcanic eruptions).

7th character

Dsubsequent encounter

Other encounter types for X35:

Notes that apply from higher levels

Instructions written at a parent level also apply to X35.XXXD.

› From X35 Volcanic eruption
Excludes2
  • tidal wave (tsunami) due to volcanic eruption (X37.41)

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

ICD-9-CM equivalent

Converter →
  • E909.1Volcanic eruptionsapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

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 X35.XXXD

Is X35.XXXD billable?

Yes. X35.XXXD is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "D" at the end of X35.XXXD mean?

It is the 7th character for subsequent encounter. Per the official guidelines, use it for encounters after active treatment, while the patient is healing or recovering.

Can X35.XXXD be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict X35.XXXD as a principal diagnosis.

Is X35.XXXD a CC or MCC?

No. X35.XXXD is neither a CC nor an MCC under MS-DRG v44.0.

What is the ICD-9 code for X35.XXXD?

The CMS General Equivalence Mappings map X35.XXXD to ICD-9-CM E909.1.