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ICD-10-CM 2027 diagnosis code

X37.42XDTidal wave due to storm, subsequent encounter

✓ Billable / specificPOA exemptRequires 7th character

X37.42XD is a valid, billable ICD-10-CM code for tidal wave due to storm, 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 X37.42XD

X37.42XD is the ICD-10-CM diagnosis code for Tidal wave due to storm, subsequent encounter. It belongs to category X37 (cataclysmic storm), 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 E908.0 (Hurricane).

7th character

Dsubsequent encounter

Other encounter types for X37.42:

Notes that apply from higher levels

Instructions written at a parent level also apply to X37.42XD.

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

ICD-9-CM equivalent

Converter →

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 X37.42XD

Is X37.42XD billable?

Yes. X37.42XD 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 X37.42XD 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 X37.42XD be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict X37.42XD as a principal diagnosis.

Is X37.42XD a CC or MCC?

No. X37.42XD is neither a CC nor an MCC under MS-DRG v44.0.

What is the ICD-9 code for X37.42XD?

The CMS General Equivalence Mappings map X37.42XD to ICD-9-CM E908.0.