ICD-10-CM 2027 diagnosis code

W57Bitten or stung by nonvenomous insect and other nonvenomous arthropods

Not billable — use a more specific code

W57 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.Short description: Bit/stung by nonvenom insect and oth nonvenomous arthropods

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About W57

W57 is the ICD-10-CM diagnosis code for Bitten or stung by nonvenomous insect and other nonvenomous arthropods. It belongs to block W50-W64 (exposure to animate mechanical forces) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: W57.XXXA (initial encounter), W57.XXXD (subsequent encounter) and W57.XXXS (sequela).

Don't report W57 together with the conditions in its Excludes1 note: contact with venomous insects and arthropods (T63.2-, T63.3-, T63.4-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under W57

Coding notes

Excludes1Not coded here — never report together with this code

contact with venomous insects and arthropods (T63.2-, T63.3-, T63.4-)

Notes that apply from higher levels

Instructions written at a parent level also apply to W57.

Broader instructions also apply from W50-W64 Exposure to animate mechanical forces and Chapter 20: External causes of morbidity.

Alphabetic index entries

9 entries

Terms in the official ICD-10-CM index that lead to W57.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about W57

Is W57 billable?: No. W57 is a header code. Report one of its more specific subcodes instead.