2027 ICD-10-CM Diagnosis Code W57Bitten or stung by nonvenomous insect and other nonvenomous arthropods

ICD-10-CM Codes›V01–Y99›W50-W64›W57

ICD-10-CM W57
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

W57 is a non-billable ICD-10-CM category code for bitten or stung by nonvenomous insect and other nonvenomous arthropods, so it cannot be submitted on claims. Use a more specific code from this category instead, such as W57.XXXA, W57.XXXD, and W57.XXXS.

Code Identity

ICD-10-CM Code
W57
Billable Status
No — Non-Billable Category
Code Describes
Bitten or stung by nonvenomous insect and other nonvenomous arthropods
Short Description
Bit/stung by nonvenom insect and oth nonvenomous arthropods
Chapter
W50-W64
Exposure to animate mechanical forces

Code Classification

ChapterV01–Y99External causes of morbidity and mortality
SectionW50-W64Exposure to animate mechanical forces
CategoryW57Bitten or stung by nonvenomous insect and other nonvenomous arthropods
This CodeW57Bitten or stung by nonvenomous insect and other nonvenomous arthropods

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to W57: its own notes plus those printed at block W50-W64 and Chapter 20. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On W57 itself
From Block W50-W64 Exposure to animate mechanical forces applies to 336 codes
  • Toxic effect of contact with venomous animals and plants (T63.-)

Notes

General instructions on how these codes are used.

From Chapter 20 (V00-Y99) External causes of morbidity and mortality applies to 7,461 codes
  • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

  • The appropriate 7th character is to be added to code W57
Values for category W57 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index; each main term links to its index entry.

  • Sting
    • arthropod, nonvenomous

Patient EducationClinical

Insect Bites and Stings

Most insect bites are harmless, though they sometimes cause discomfort. Bee, wasp, and hornet stings and fire ant bites usually hurt. Mosquito and flea bites usually itch. Insects can also spread diseases. In the United States, some mosquitoes spread West Nile virus.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About W57Overview

What is the ICD-10 code for bitten or stung by nonvenomous insect and other nonvenomous arthropods?

W57 is the ICD-10-CM category for bitten or stung by nonvenomous insect and other nonvenomous arthropods, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is W57 a billable code?

No. This is a category header that groups the codes for bitten or stung by nonvenomous insect and other nonvenomous arthropods, and headers cannot be submitted on claims. Claims for bitten or stung by nonvenomous insect and other nonvenomous arthropods need a more specific code from this category, such as W57.XXXA, W57.XXXD, and W57.XXXS.

Can W57 be reported with a code from T63.2?

Not as a rule. The Excludes1 note on W57 lists "contact with venomous insects and arthropods (T63.2-, T63.3-, T63.4-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).