ICD-10-CM 2027 diagnosis code
X31.XXXDExposure to excessive natural cold, subsequent encounter
X31.XXXD is a valid, billable ICD-10-CM code for exposure to excessive natural cold, 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 X31.XXXD
X31.XXXD is the ICD-10-CM diagnosis code for exposure to excessive natural cold, subsequent encounter. It belongs to category X31 (exposure to excessive natural cold), 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 E901.0 (accident due to excessive cold due to weather conditions).
7th character
Dsubsequent encounter
Other encounter types for X31:
Notes that apply from higher levels
Instructions written at a parent level also apply to X31.XXXD.
Broader instructions also apply from Chapter 20: External causes of morbidity.
ICD-9-CM equivalent
Converter →- E901.0Accident due to excessive cold due to weather conditionsapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about X31.XXXD
Is X31.XXXD billable?
- Yes. X31.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 X31.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 X31.XXXD be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict X31.XXXD as a principal diagnosis.
Is X31.XXXD a CC or MCC?
- No. X31.XXXD is neither a CC nor an MCC under MS-DRG v44.0.
What is the ICD-9 code for X31.XXXD?
- The CMS General Equivalence Mappings map X31.XXXD to ICD-9-CM E901.0.