2026 ICD-10-CM Diagnosis Code W57Bitten or stung by nonvenomous insect and other nonvenomous arthropods
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
Code Classification
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
7th Character Note
- The appropriate 7th character is to be added to code W57
7th Character
- A - initial encounter
- D - subsequent encounter
- S - sequela
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
Indicates that a seventh character is to be assigned to codes in a subcategory.
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
Questions About W57Overview
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.
