ICD-10-CM 2027 diagnosis code
W58.09XSOther contact with alligator, sequela
W58.09XS is a valid, billable ICD-10-CM code for other contact with alligator, sequela. 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 W58.09XS
W58.09XS is the ICD-10-CM diagnosis code for other contact with alligator, sequela. It belongs to category W58 (contact with crocodile or alligator), block W50-W64 (exposure to animate mechanical forces) 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 "S" means sequela: use it for complications or conditions that arise as a direct result of the original 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 E929.5 (late effects of accident due to natural and environmental factors).
7th character
Ssequela
Other encounter types for W58.09:
Notes that apply from higher levels
Instructions written at a parent level also apply to W58.09XS.
Broader instructions also apply from W50-W64 Exposure to animate mechanical forces and Chapter 20: External causes of morbidity.
ICD-9-CM equivalent
Converter →- E929.5Late effects of accident due to natural and environmental factorsapproximate
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 W58.09XS
Is W58.09XS billable?
- Yes. W58.09XS is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "S" at the end of W58.09XS mean?
- It is the 7th character for sequela. Per the official guidelines, use it for complications or conditions that arise as a direct result of the original condition.
Can W58.09XS be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict W58.09XS as a principal diagnosis.
Is W58.09XS a CC or MCC?
- No. W58.09XS is neither a CC nor an MCC under MS-DRG v44.0.
What is the ICD-9 code for W58.09XS?
- The CMS General Equivalence Mappings map W58.09XS to ICD-9-CM E929.5.