W16.91XA (Jumping or diving into unspecified water causing drowning and submersion, initial encounter) compared with W21.4 (Striking against diving board), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Add a secondary code when documented.
“code for subsequent falling into water, if applicable (W16.-)”
A "Use additional code" note means a secondary code should follow this one to fully describe the condition when the documentation supports it.
Source: CMS ICD-10-CM tabular instructional notes
Distinct conditions — both may be reported.
“striking or hitting diving board (W21.4)”
An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.
Source: CMS ICD-10-CM tabular instructional notes
Yes, when both are documented. W16.91XA carries an Excludes2 note covering W21.4: “striking or hitting diving board (W21.4)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
1stW21.4 then W16.91XA
W21.4 carries a Use Additional Code instruction covering W16.91XA: “code for subsequent falling into water, if applicable (W16.-)”
| W16.91XAJumping or diving into unspecified water causing drowning and submersion, initial encounter | W21.4Striking against diving board | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | V00-Y99 — External Causes of Morbidity (V00-Y99) | V00-Y99 — External Causes of Morbidity (V00-Y99) |
| Definition | Jumping or diving into unspecified water causing drowning and submersion, initial encounter is a billable ICD-10-CM diagnosis code (W16.91A). | Striking against diving board is a non-billable ICD-10-CM category code (W21.4). |
| 7th character | The appropriate 7th character is to be added to each code from category W16 | The appropriate 7th character is to be added to each code from category W21 |
| Use additional code | — | code for subsequent falling into water, if applicable (W16.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources