2024 ICD-10-CM Diagnosis Code W57.XXXA

Bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter

ICD-10-CM Code:
W57.XXXA
ICD-10 Code for:
Bit/stung by nonvenom insect & oth nonvenom arthropods, init
Is Billable?
Yes - Valid for Submission
Code Navigator:

Code Classification

  • External causes of morbidity and mortality
    (V01–Y99)
    • Exposure to animate mechanical forces
      (W50-W64)
      • Bitten or stung by nonvenomous insect and other nonvenomous arthropods
        (W57)

W57.XXXA is a billable diagnosis 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 current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

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:

  • Allergic dermatitis caused by bite of Ctenocephalides canis
  • Allergic reaction caused by insect bite and/or insect sting
  • Animal bite of ankle
  • Animal bite of ankle
  • Animal bite of axilla
  • Animal bite of axilla
  • Animal bite of back
  • Animal bite of back
  • Animal bite of cheek
  • Animal bite of ear region
  • Animal bite of ear region
  • Animal bite of genitalia
  • Animal bite of hip
  • Animal bite of hip
  • Animal bite of hip
  • Animal bite of hip
  • Animal bite of mouth
  • Animal bite of mouth
  • Animal bite of nose
  • Animal bite of upper arm
  • Animal bite of upper arm
  • Animal bite of upper arm
  • Animal bite of upper arm
  • Animal bite of wrist
  • Animal bite of wrist
  • Animal bite of wrist
  • Animal bite of wrist
  • Arthropod dermatosis
  • Bite by fire ant
  • Bite in axilla
  • Bite in axilla
  • Bite of animal flea
  • Bite of Anoplura species
  • Bite of arthropod
  • Bite of bed bug
  • Bite of body louse
  • Bite of Diptera species
  • Bite of gnat
  • Bite of Hemiptera species
  • Bite of horse-fly
  • Bite of human flea
  • Bite of insect
  • Bite of midge
  • Bite of mosquito
  • Bite of nonvenomous arthropod
  • Bite of nonvenomous insect
  • Bite of nonvenomous spider
  • Bite of pubic louse
  • Bite of reduviid bug
  • Bite of sandfly
  • Bite of spider
  • Bite of Syphonaptera species
  • Bite of thrip
  • Bite of tick
  • Bite of tsetse fly
  • Bite wound of breast
  • Bite wound of breast
  • Bite wound of external ear
  • Bite wound of external ear
  • Bite wound of left breast
  • Bite wound of left external ear
  • Bite wound of left eye region
  • Bite wound of left eye region
  • Bite wound of left eye region
  • Bite wound of left knee region
  • Bite wound of left knee region
  • Bite wound of mouth
  • Bite wound of mouth
  • Bite wound of nose
  • Bite wound of right breast
  • Bite wound of right external ear
  • Bite wound of right eye region
  • Bite wound of right eye region
  • Bite wound of right eye region
  • Bite wound of right knee region
  • Bite wound of right knee region
  • Blackfly bite
  • Bullous insect bite reaction
  • Dermatosis caused by Arachnida
  • Dermatosis caused by beetle
  • Dermatosis caused by flea
  • Dermatosis caused by moth and/or butterfly
  • Dermatosis caused by spider
  • Flea bites
  • Fly bite
  • Infected wound of bilateral eyelids due to nonvenomous insect bite
  • Infected wound of eyelid due to nonvenomous insect bite
  • Infected wound of eyelid due to nonvenomous insect bite
  • Infected wound of eyelid due to nonvenomous insect bite
  • Infected wound of eyelid due to nonvenomous insect bite
  • Infected wound of left elbow due to non venomous insect bite
  • Infected wound of left eyelid due to nonvenomous insect bite
  • Infected wound of left eyelid due to nonvenomous insect bite
  • Infected wound of left foot due to nonvenomous insect bite
  • Infected wound of left forearm due to non venomous insect bite
  • Infected wound of left hip due to nonvenomous insect bite
  • Infected wound of left knee due to nonvenomous insect bite
  • Infected wound of left lower leg due to nonvenomous insect bite
  • Infected wound of left thigh due to nonvenomous insect bite
  • Infected wound of left upper arm due to non venomous insect bite
  • Infected wound of left wrist due to non venomous insect bite
  • Infected wound of low back due to nonvenomous insect bite
  • Infected wound of right elbow due to non venomous insect bite
  • Infected wound of right eyelid due to nonvenomous insect bite
  • Infected wound of right eyelid due to nonvenomous insect bite
  • Infected wound of right foot due to nonvenomous insect bite
  • Infected wound of right forearm due to non venomous insect bite
  • Infected wound of right hip due to nonvenomous insect bite
  • Infected wound of right knee due to nonvenomous insect bite
  • Infected wound of right lower leg due to nonvenomous insect bite
  • Infected wound of right thigh due to nonvenomous insect bite
  • Infected wound of right upper arm due to non venomous insect bite
  • Infected wound of right wrist due to non venomous insect bite
  • Infection of tick bite
  • Insect bite of cheek
  • Insect bite of ear region
  • Insect bite of ear region
  • Insect bite of eye region
  • Insect bite of eye region
  • Insect bite of eye region
  • Insect bite of eye region
  • Insect bite of eye region
  • Insect bite of eye region
  • Insect bite of eyelid
  • Insect bite of eyelid
  • Insect bite of eyelid
  • Insect bite of eyelid
  • Insect bite of eyelid
  • Insect bite of eyelid
  • Insect bite of eyelids and periocular area
  • Insect bite of eyelids and periocular area
  • Insect bite of eyelids and periocular area
  • Insect bite of eyelids and periocular area
  • Insect bite of eyelids and periocular area
  • Insect bite of eyelids and periocular area
  • Insect bite of genitalia
  • Insect bite of mouth
  • Insect bite of nose
  • Insect bite reaction
  • Insect bite to arm - nonvenomous
  • Insect bite to cornea - nonvenomous
  • Insect bite to trunk - nonvenomous
  • Insect bite, nonvenomous, lower leg
  • Insect bite, nonvenomous, lower leg
  • Insect bite, nonvenomous, lower leg
  • Insect bite, nonvenomous, lower leg
  • Insect bite, nonvenomous, of ankle
  • Insect bite, nonvenomous, of ankle
  • Insect bite, nonvenomous, of axilla
  • Insect bite, nonvenomous, of axilla
  • Insect bite, nonvenomous, of back
  • Insect bite, nonvenomous, of back
  • Insect bite, nonvenomous, of breast
  • Insect bite, nonvenomous, of breast
  • Insect bite, nonvenomous, of chest wall
  • Insect bite, nonvenomous, of chest wall
  • Insect bite, nonvenomous, of chest wall
  • Insect bite, nonvenomous, of chest wall
  • Insect bite, nonvenomous, of elbow
  • Insect bite, nonvenomous, of elbow
  • Insect bite, nonvenomous, of elbow
  • Insect bite, nonvenomous, of elbow
  • Insect bite, nonvenomous, of forearm
  • Insect bite, nonvenomous, of forearm
  • Insect bite, nonvenomous, of forearm
  • Insect bite, nonvenomous, of forearm
  • Insect bite, nonvenomous, of head, infected
  • Insect bite, nonvenomous, of head, infected
  • Insect bite, nonvenomous, of head, infected
  • Insect bite, nonvenomous, of head, infected
  • Insect bite, nonvenomous, of hip
  • Insect bite, nonvenomous, of hip
  • Insect bite, nonvenomous, of hip
  • Insect bite, nonvenomous, of hip
  • Insect bite, nonvenomous, of knee
  • Insect bite, nonvenomous, of knee
  • Insect bite, nonvenomous, of knee
  • Insect bite, nonvenomous, of knee
  • Insect bite, nonvenomous, of knee, infected
  • Insect bite, nonvenomous, of knee, infected
  • Insect bite, nonvenomous, of perineum
  • Insect bite, nonvenomous, of scrotum and testis
  • Insect bite, nonvenomous, of shoulder
  • Insect bite, nonvenomous, of shoulder
  • Insect bite, nonvenomous, of thigh
  • Insect bite, nonvenomous, of thigh
  • Insect bite, nonvenomous, of thigh
  • Insect bite, nonvenomous, of thigh
  • Insect bite, nonvenomous, of upper arm
  • Insect bite, nonvenomous, of upper arm
  • Insect bite, nonvenomous, of upper arm
  • Insect bite, nonvenomous, of upper arm
  • Insect bite, nonvenomous, of wrist
  • Insect bite, nonvenomous, of wrist
  • Insect bite, nonvenomous, of wrist
  • Insect bite, nonvenomous, of wrist
  • Leech bite
  • Left knee superficial injury of skin
  • Left knee superficial injury of skin
  • Millipede burn
  • Mosquito bite
  • Nonvenomous insect bite
  • Nonvenomous insect bite of back with infection
  • Nonvenomous insect bite of cheek
  • Nonvenomous insect bite of elbow with infection
  • Nonvenomous insect bite of elbow with infection
  • Nonvenomous insect bite of face with infection
  • Nonvenomous insect bite of face with infection
  • Nonvenomous insect bite of face with infection
  • Nonvenomous insect bite of face with infection
  • Nonvenomous insect bite of face without infection
  • Nonvenomous insect bite of finger of left hand
  • Nonvenomous insect bite of finger of left hand
  • Nonvenomous insect bite of finger of right hand
  • Nonvenomous insect bite of finger of right hand
  • Nonvenomous insect bite of foot with infection
  • Nonvenomous insect bite of foot with infection
  • Nonvenomous insect bite of forearm with infection
  • Nonvenomous insect bite of forearm with infection
  • Nonvenomous insect bite of gum
  • Nonvenomous insect bite of hip with infection
  • Nonvenomous insect bite of hip with infection
  • Nonvenomous insect bite of left hand
  • Nonvenomous insect bite of left hand
  • Nonvenomous insect bite of left hand
  • Nonvenomous insect bite of lip without infection
  • Nonvenomous insect bite of lower leg with infection
  • Nonvenomous insect bite of lower leg with infection
  • Nonvenomous insect bite of middle finger
  • Nonvenomous insect bite of middle finger
  • Nonvenomous insect bite of middle finger of left hand
  • Nonvenomous insect bite of middle finger of right hand
  • Nonvenomous insect bite of multiple sites
  • Nonvenomous insect bite of multiple sites
  • Nonvenomous insect bite of multiple sites with infection
  • Nonvenomous insect bite of nose
  • Nonvenomous insect bite of right hand
  • Nonvenomous insect bite of right hand
  • Nonvenomous insect bite of right hand
  • Nonvenomous insect bite of scrotum
  • Nonvenomous insect bite of thigh with infection
  • Nonvenomous insect bite of thigh with infection
  • Nonvenomous insect bite of trunk with infection
  • Nonvenomous insect bite of trunk without infection
  • Nonvenomous insect bite of upper arm with infection
  • Nonvenomous insect bite of upper arm with infection
  • Nonvenomous insect bite of wrist with infection
  • Nonvenomous insect bite of wrist with infection
  • Nonvenomous insect bite with infection
  • Nonvenomous insect bite without infection
  • Poisoning due to bite of fire ant
  • Right knee superficial injury of skin
  • Right knee superficial injury of skin
  • Sting by ant
  • Sting by ant
  • Sting by bee
  • Sting by bumble bee
  • Sting by fire ant
  • Sting by harvester ant
  • Sting by hornet
  • Sting by hymenoptera
  • Sting by hymenoptera
  • Sting by insect
  • Sting by wasp
  • Superficial injuries involving multiple body regions
  • Superficial injuries involving multiple body regions
  • Superficial injury of cornea
  • Superficial injury of elbow with infection
  • Superficial injury of elbow with infection
  • Superficial injury of face without infection
  • Superficial injury of forearm with infection
  • Superficial injury of forearm with infection
  • Superficial injury of hip with infection
  • Superficial injury of hip with infection
  • Superficial injury of left ear
  • Superficial injury of left elbow
  • Superficial injury of left elbow
  • Superficial injury of left eyelid
  • Superficial injury of left eyelid
  • Superficial injury of left eyelid
  • Superficial injury of left forearm
  • Superficial injury of left forearm
  • Superficial injury of left lower leg
  • Superficial injury of left lower leg
  • Superficial injury of lip
  • Superficial injury of lip without infection
  • Superficial injury of lower back
  • Superficial injury of lower back
  • Superficial injury of lower leg with infection
  • Superficial injury of lower leg with infection
  • Superficial injury of right ear
  • Superficial injury of right elbow
  • Superficial injury of right elbow
  • Superficial injury of right eyelid
  • Superficial injury of right eyelid
  • Superficial injury of right eyelid
  • Superficial injury of right forearm
  • Superficial injury of right forearm
  • Superficial injury of right lower leg
  • Superficial injury of right lower leg
  • Superficial injury of scrotum
  • Superficial injury of thigh with infection
  • Superficial injury of thigh with infection
  • Superficial injury of upper arm with infection
  • Superficial injury of upper arm with infection
  • Superficial injury of wrist with infection
  • Superficial injury of wrist with infection
  • Thrip bite
  • Tick bite
  • Tick bite
  • Wound of head due to nonvenomous insect bite
  • Wound of left ankle due to nonvenomous insect bite
  • Wound of left axilla due to nonvenomous insect bite
  • Wound of left breast due to nonvenomous insect bite
  • Wound of left ear due to nonvenomous insect bite
  • Wound of left elbow region due to nonvenomous insect bite
  • Wound of left elbow region due to nonvenomous insect bite
  • Wound of left eyelid due to nonvenomous insect bite
  • Wound of left eyelid due to nonvenomous insect bite
  • Wound of left eyelid due to nonvenomous insect bite
  • Wound of left foot due to nonvenomous insect bite
  • Wound of left foot due to nonvenomous insect bite
  • Wound of left forearm due to nonvenomous insect bite
  • Wound of left forearm due to nonvenomous insect bite
  • Wound of left half of chest wall due to nonvenomous insect bite
  • Wound of left half of chest wall due to nonvenomous insect bite
  • Wound of left hip region due to nonvenomous insect bite
  • Wound of left hip region due to nonvenomous insect bite
  • Wound of left knee region due to nonvenomous insect bite
  • Wound of left knee region due to nonvenomous insect bite
  • Wound of left lower leg due to nonvenomous insect bite
  • Wound of left lower leg due to nonvenomous insect bite
  • Wound of left shoulder due to nonvenomous insect bite
  • Wound of left thigh due to nonvenomous insect bite
  • Wound of left thigh due to nonvenomous insect bite
  • Wound of left upper arm due to nonvenomous insect bite
  • Wound of left upper arm due to nonvenomous insect bite
  • Wound of left wrist due to nonvenomous insect bite
  • Wound of left wrist due to nonvenomous insect bite
  • Wound of lower back due to nonvenomous insect bite
  • Wound of lower back due to nonvenomous insect bite
  • Wound of right ankle due to nonvenomous insect bite
  • Wound of right axilla due to nonvenomous insect bite
  • Wound of right breast due to nonvenomous insect bite
  • Wound of right ear due to nonvenomous insect bite
  • Wound of right elbow region due to nonvenomous insect bite
  • Wound of right elbow region due to nonvenomous insect bite
  • Wound of right eyelid due to nonvenomous insect bite
  • Wound of right eyelid due to nonvenomous insect bite
  • Wound of right eyelid due to nonvenomous insect bite
  • Wound of right foot due to nonvenomous insect bite
  • Wound of right foot due to nonvenomous insect bite
  • Wound of right forearm due to nonvenomous insect bite
  • Wound of right forearm due to nonvenomous insect bite
  • Wound of right half of chest wall due to nonvenomous insect bite
  • Wound of right half of chest wall due to nonvenomous insect bite
  • Wound of right hip region due to nonvenomous insect bite
  • Wound of right hip region due to nonvenomous insect bite
  • Wound of right knee region due to nonvenomous insect bite
  • Wound of right knee region due to nonvenomous insect bite
  • Wound of right lower leg due to nonvenomous insect bite
  • Wound of right lower leg due to nonvenomous insect bite
  • Wound of right shoulder due to nonvenomous insect bite
  • Wound of right thigh due to nonvenomous insect bite
  • Wound of right thigh due to nonvenomous insect bite
  • Wound of right upper arm due to nonvenomous insect bite
  • Wound of right upper arm due to nonvenomous insect bite
  • Wound of right wrist due to nonvenomous insect bite
  • Wound of right wrist due to nonvenomous insect bite

Clinical Classification

Clinical CategoryCCSR Category CodeInpatient Default CCSROutpatient Default CCSR
External cause codes: bites; initial encounterEXT012X - Not applicable.X - Not applicable.
External cause codes: intent of injury, accidental/unintentionalEXT020X - Not applicable.X - Not applicable.

Clinical Information

  • Superficial Injury of Cornea

    trauma to the corneal epithelium.

Convert W57.XXXA to ICD-9-CM

  • ICD-9-CM Code: E906.4 - 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:

  • Don't bother insects
  • Use insect repellant
  • Wear protective clothing
  • Be careful when you eat outside because food attracts insects
  • If you know you have severe allergic reactions to insect bites and stings (such as anaphylaxis), carry an emergency epinephrine kit

[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:

  • Wash the area well with soap and water
  • Apply an ice pack or a wet compress to the area
  • Take over-the-counter pain medicine, if needed
  • Consider using antihistamines for severe swelling
  • Seek medical treatment for small children and adults with severe symptoms


[Learn More in MedlinePlus]

Tick Bites

What are ticks?

Ticks are small parasites. They may look like insects, but they have eight legs and are related to spiders. Ticks feed on the blood of people and warm-blooded animals. There are many types of ticks in the United States, and they live in different parts of the country.

Ticks can be different colors and sizes. They can be light-colored, reddish brown, or dark brown. Some ticks are so small that they can be difficult to see. Ticks may get on you if you walk though areas where they live, such as tall grass, leaf litter or shrubs.

Why do I need to be worried about tick bites?

If you spend time outdoors or have pets that go outdoors, you need to beware of ticks. When they bite, certain types of ticks can pass on germs that cause different diseases. Sometimes the symptoms can be mild. In other cases, you can have serious, long-lasting health problems. Some of the diseases you can get from a tick bite (called tickborne diseases) include:

  • Lyme disease
  • Alpha-gal syndrome (tick bite red meat allergy)
  • Babesiosis
  • Ehrlichiosis
  • Rocky Mountain spotted fever
  • Tularemia

What happens if I get bitten by a tick?

You may not feel it when a tick bites you. The tick can stay attached to your body for several days. If that tick is infected, it can pass along any germs to you once it starts sucking your blood. But if you catch it and remove it before it has filled up on your blood, you are less likely to get infected.

How do I remove a tick?

If you find a tick attached to your skin, remove the tick as soon as you can. You could use a tick removal device or a fine-tipped tweezers:

  • Using the tweezers, grab the tick as close to your skin as possible.
  • Pull upward with steady, even pressure. Don't twist or jerk the tick. You want to remove the whole tick in one piece if you can. If the mouth-parts of the tick break off and stay in the skin, try to remove them. But if you can't remove them easily, then leave them.
  • Thoroughly clean the bite area and your hands with rubbing alcohol or soap and water.

When do I need to contact my health care provider about a tick bite?

Many tickborne diseases can have similar signs and symptoms. The most common are:

  • Fever
  • Chills
  • Aches and pains
  • Rash

If you develop any of these symptoms within several weeks of removing a tick, contact your provider.

How can I prevent tick bites?

There are steps you can take to prevent tick bites:

  • Avoid wooded, brushy, and grassy areas, especially during warmer months.
  • Wear insect repellent with DEET, picaridin or another U.S. Environmental Protection Agency (EPA)-registered insect repellent.
  • Wear light-colored protective clothing.
  • Treat your clothing and gear with products containing 0.5% permethrin.
  • Tuck your pant legs into your socks and your shirt into your pants.
  • Remove your clothing after being outdoors. Check your clothing for ticks and remove any ticks that you find. Wash and dry your clothes at high temperatures.
  • Check yourself, your children, and your pets daily for ticks and carefully remove any ticks you find.

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.