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ICD-10-CM 2027 diagnosis code

X38.XXXAFlood, initial encounter

✓ Billable / specificRequires 7th character

X38.XXXA is a valid, billable ICD-10-CM code for flood, initial 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 X38.XXXA

X38.XXXA is the ICD-10-CM diagnosis code for Flood, initial encounter. It belongs to category X38 (Flood), 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 "A" means initial encounter: use it while the patient is receiving active treatment for the condition.

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

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 E908.2 (floods).

7th character

Ainitial encounter

Other encounter types for X38:

Notes that apply from higher levels

Instructions written at a parent level also apply to X38.XXXA.

› From X38 Flood
Excludes1
  • collapse of dam or man-made structure causing earth movement (X36.0)
  • tidal wave NOS (X37.41)
  • tidal wave caused by storm (X37.42)

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 X38.XXXA

Is X38.XXXA billable?

Yes. X38.XXXA is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "A" at the end of X38.XXXA mean?

It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.

Can X38.XXXA be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict X38.XXXA as a principal diagnosis.

Is X38.XXXA a CC or MCC?

No. X38.XXXA is neither a CC nor an MCC under MS-DRG v44.0.

What is the ICD-9 code for X38.XXXA?

The CMS General Equivalence Mappings map X38.XXXA to ICD-9-CM E908.2.