ICD-10-CM 2027 diagnosis code
W21.07XAStruck by softball, initial encounter
W21.07XA is a valid, billable ICD-10-CM code for struck by softball, 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 W21.07XA
W21.07XA is the ICD-10-CM diagnosis code for struck by softball, initial encounter. It belongs to category W21 (striking against or struck by sports equipment), block W20-W49 (exposure to inanimate 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 "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 E917.0 (striking against or struck accidentally by objects or persons in sports).
7th character
Ainitial encounter
Other encounter types for W21.07:
Notes that apply from higher levels
Instructions written at a parent level also apply to W21.07XA.
Broader instructions also apply from W20-W49 Exposure to inanimate mechanical forces and Chapter 20: External causes of morbidity.
ICD-9-CM equivalent
Converter →- E917.0Striking against or struck accidentally by objects or persons in sportsapproximate
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 W21.07XA
Is W21.07XA billable?
- Yes. W21.07XA 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 W21.07XA 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 W21.07XA be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict W21.07XA as a principal diagnosis.
Is W21.07XA a CC or MCC?
- No. W21.07XA is neither a CC nor an MCC under MS-DRG v44.0.
What is the ICD-9 code for W21.07XA?
- The CMS General Equivalence Mappings map W21.07XA to ICD-9-CM E917.0.