ICD-10-CM 2027 diagnosis code
X39.08XAExposure to other natural radiation, initial encounter
X39.08XA is a valid, billable ICD-10-CM code for exposure to other natural radiation, 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 X39.08XA
X39.08XA is the ICD-10-CM diagnosis code for exposure to other natural radiation, initial encounter. It belongs to category X39 (exposure to other forces of nature), 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 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 E926.8 (exposure to other specified radiation).
7th character
Ainitial encounter
Other encounter types for X39.08:
Notes that apply from higher levels
Instructions written at a parent level also apply to X39.08XA.
Broader instructions also apply from Chapter 20: External causes of morbidity.
ICD-9-CM equivalent
Converter →- E926.8Exposure to other specified radiationapproximate
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 X39.08XA
Is X39.08XA billable?
- Yes. X39.08XA 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 X39.08XA 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 X39.08XA be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict X39.08XA as a principal diagnosis.
Is X39.08XA a CC or MCC?
- No. X39.08XA is neither a CC nor an MCC under MS-DRG v44.0.
What is the ICD-9 code for X39.08XA?
- The CMS General Equivalence Mappings map X39.08XA to ICD-9-CM E926.8.