W53.21XS — Bitten by squirrel, sequela
Is W53.21XS billable?
Yes — W53.21XS is billable for FY2027. W53.21XS is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. W53.21XS may be submitted for encounters from October 1, 2026 through September 30, 2027.
W53.21XS at a glance
| Code | W53.21XS |
|---|---|
| Description | Bitten by squirrel, 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 W53.21XS?
In W53.21XS, the 7th character S means sequela. The 7th character is required for W53.21XS to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
How is W53.21XS listed in the External Cause Index?
The External Cause of Injuries Index lists these routes under W53.21, the nearest indexed parent of W53.21XS. This is a separate index from the Alphabetic Index and is where external cause codes are looked up.
- Bite, bitten by › squirrel
- Bite, bitten by › rodent › squirrel
- Contact › with › rodent › squirrel › bite (accidental)
Excludes1 — never code together — inherited from W50-W64
The conditions below can never be reported together with W53.21XS on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- Toxic effect of contact with venomous animals and plants (T63.-)
How long has W53.21XS existed?
W53.21XS 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.