W57.XXXA — Bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter

W57.XXXA

ICD-10 Chapter 20: External Causes of Morbidity — illustrative image — Chapter 20: External causes of morbidity (V00–Y99) — illustrative image

What this code means

An external-cause code recording a bite or sting by a nonvenomous insect or other nonvenomous arthropod, such as a tick or bedbug; first encounter.

Also called: insect bite, nonvenomous insect sting, tick bite.

When this code is used

Used as an additional code for bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter.

Where it sits in ICD-10-CM

Code W57.XXXA belongs to Chapter 20: External causes of morbidity, which covers codes V00–Y99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related symptoms

Frequently asked questions

What is ICD-10-CM code W57.XXXA?

W57.XXXA is the ICD-10-CM diagnosis code for “Bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter”. An external-cause code recording a bite or sting by a nonvenomous insect or other nonvenomous arthropod, such as a tick or bedbug; first encounter.

When is code W57.XXXA used?

Used as an additional code for bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter. It belongs to Chapter 20 of ICD-10-CM (External causes of morbidity).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.