ICD-10-CM diagnosis code
W16.42XA Fall into unspecified water causing other injury, initial encounter
- Billable
- Yes, a complete code (FY2026)
Encounter (7th character)
This code is for the initial encounter: the patient is receiving active treatment for the condition (for example surgery, an emergency department visit or evaluation by a new clinician).
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Other codes in W16
138 complete codes in this category.
- W16.332AFall into other water striking wall causing other injury, initial encounter
- W16.332DFall into other water striking wall causing other injury, subsequent encounter
- W16.332SFall into other water striking wall causing other injury, sequela
- W16.41XAFall into unspecified water causing drowning and submersion, initial encounter
- W16.41XDFall into unspecified water causing drowning and submersion, subsequent encounter
- W16.41XSFall into unspecified water causing drowning and submersion, sequela
- W16.42XAFall into unspecified water causing other injury, initial encounter
- W16.42XDFall into unspecified water causing other injury, subsequent encounter
- W16.42XSFall into unspecified water causing other injury, sequela
- W16.511AJumping or diving into swimming pool striking water surface causing drowning and submersion, initial encounter
- W16.511DJumping or diving into swimming pool striking water surface causing drowning and submersion, subsequent encounter
- W16.511SJumping or diving into swimming pool striking water surface causing drowning and submersion, sequela
Documentation tips
- Make sure the note supports every element of the title, “Fall into unspecified water causing other injury, initial encounter”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to W16.
The international WHO ICD-10 also has W16, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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