Y21.4XXS — Drowning and submersion in natural water, undetermined intent, sequela
Is Y21.4XXS billable?
Yes — Y21.4XXS is billable for FY2027. Y21.4XXS is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. Y21.4XXS may be submitted for encounters from October 1, 2026 through September 30, 2027.
Y21.4XXS at a glance
| Code | Y21.4XXS |
|---|---|
| Description | Drowning and submersion in natural water, undetermined intent, sequela |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "S" | sequela |
What does the 7th character "S" mean in Y21.4XXS?
In Y21.4XXS, the 7th character S means sequela. The 7th character is required for Y21.4XXS to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
How is Y21.4XXS listed in the External Cause Index?
The External Cause of Injuries Index lists these routes under Y21.4, the nearest indexed parent of Y21.4XXS. This is a separate index from the Alphabetic Index and is where external cause codes are looked up.
- Undetermined intent › drowning › natural water (contact) (exposure)
- Drowning › in › natural water › stated as undetermined whether accidental or intentional (accidental)
How long has Y21.4XXS existed?
Y21.4XXS has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.