W16.4Header code — not billable
Fall into unspecified water
- Chapter
- 20. External causes of morbidity
- Category
- W16
- Effective date
- October 1, 2026
Related codes in category W16
W16Fall, jump or diving into waterW16.0Fall into swimming poolW16.01Fall into swimming pool striking water surfaceW16.011Fall into swimming pool striking water surface causing drownW16.011AFall into swimming pool striking surfc causing drown, initYesW16.011DFall into swimming pool striking surfc causing drown, subsYesW16.011SFall into swimming pool strk surfc causing drown, sequelaYesW16.012Fall into swimming pool striking surfc causing oth injuryW16.012AFall into swimming pool strk surfc causing oth injury, initYesW16.012DFall into swimming pool strk surfc causing oth injury, subsYesW16.012SFall into swim pool strk surfc causing oth injury, sequelaYesW16.02Fall into swimming pool striking bottom
Frequently asked questions
What is ICD-10 code W16.4?
W16.4 is an ICD-10-CM diagnosis code for Fall into unspecified water.
Is W16.4 a billable code?
No. W16.4 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is W16.4 in?
W16.4 falls under Chapter 20: External causes of morbidity.
When did W16.4 become effective?
W16.4 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to W16.4?
W16.4 belongs to category W16, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.