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

Version 2023
Billable Code
7th Character Code
Initial Code
Convert to ICD-9
ICD-10:W57.XXXA
Short Description:Bit/stung by nonvenom insect & oth nonvenom arthropods, init
Long Description:Bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter
Status: Valid for Submission
Version:ICD-10-CM 2023
Code Classification:
  • External causes of morbidity and mortality (V01–Y98)
    • Exposure to animate mechanical forces (W50-W64)
      • Bit/stung by nonvenom insect and oth nonvenomous arthropods (W57)

W57.XXXA is a billable ICD-10 code used to specify a medical diagnosis of bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter. The code is valid during the fiscal year 2023 from October 01, 2022 through September 30, 2023 for the submission of HIPAA-covered transactions.

W57.XXXA is an initial encounter code, includes a 7th character and should be used while the patient is receiving active treatment for a condition like bitten or stung by nonvenomous insect and other nonvenomous arthropods. According to ICD-10-CM Guidelines an "initial encounter" doesn't necessarily means "initial visit". The 7th character should be used when the patient is undergoing active treatment regardless if new or different providers saw the patient over the course of a treatment. The appropriate 7th character codes should also be used even if the patient delayed seeking treatment for a condition.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Clinical Information

Convert to ICD-9 Code

Source ICD-10 CodeTarget ICD-9 Code
W57.XXXAE906.4 - Nonvenom arthropod bite
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education


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. Travelers outside the United States may be at risk for malaria and other infections.

To prevent insect bites and their complications:


[Learn More in MedlinePlus]

Spider Bites

Though many people are afraid of spiders, they rarely bite people unless threatened. Most spider bites are harmless. Occasionally, spider bites can cause allergic reactions. And bites by the venomous black widow and brown recluse spiders can be very dangerous to people.

If you are bitten by a spider, you may see a reaction similar to that of a bee sting, including redness, pain and swelling at the site. To treat a spider bite:


[Learn More in MedlinePlus]

Tick Bites

If you spend time outdoors or have pets that go outdoors, you need to beware of ticks. Ticks are small bloodsucking parasites. Many species transmit diseases to animals and people. Some of the diseases you can get from a tick bite are Lyme disease, ehrlichiosis, Rocky Mountain spotted fever and tularemia.

Some ticks are so small that they can be difficult to see. Ticks may get on you if you walk through areas where they live, such as tall grass, leaf litter or shrubs.

Tick-borne diseases occur worldwide, including in your own backyard. To help protect yourself and your family, you should:


[Learn More in MedlinePlus]

Code History

Previous Code: W57

Parent Code: W57

Next Code: W57.XXXD