Codes / ICD10CM / S90.862

S90.862 Insect bite (nonvenomous), left foot

ICD10CM code

ICD10CM

Name of the Condition

  • Insect bite (nonvenomous), left foot

Summary

An insect bite (nonvenomous) of the left foot is a localized skin reaction caused by the bite of a nonvenomous insect, resulting in mild irritation, redness, or swelling. This condition typically involves a small puncture or break in the skin where the insect introduced saliva or other substances, triggering an inflammatory response. The reaction is generally self-limited and resolves without significant complications.

Causes

Insect bites (nonvenomous) of the foot occur when a nonvenomous insect, such as a mosquito, tick, or flea, bites the skin to feed on blood or other bodily fluids. The bite introduces saliva or other substances that may cause an allergic or inflammatory reaction. Common scenarios include outdoor activities, walking barefoot in grassy or wooded areas, or exposure to insects in residential or natural environments.

Risk Factors

  • Exposure to environments with high insect activity, such as gardens, forests, or near standing water.
  • Walking barefoot or in open-toed footwear, increasing skin exposure.
  • Engaging in outdoor activities during peak insect activity times (e.g., dawn, dusk).
  • Pre-existing skin sensitivity or allergic reactions to insect saliva.

Symptoms

  • Localized redness, swelling, or itching at the bite site.
  • Mild pain or tenderness.
  • Small raised bumps or wheals.
  • Possible blistering in more severe reactions.

Diagnosis

Diagnosis is typically based on clinical presentation and patient history. A healthcare provider may examine the bite site, inquire about recent exposure to insects, and assess symptoms. In most cases, no additional testing is required unless complications or severe reactions are suspected.

Treatment Options

  • Symptomatic relief with over-the-counter antihistamines or topical corticosteroids to reduce itching and inflammation.
  • Cold compresses to alleviate swelling and discomfort.
  • Avoiding scratching to prevent secondary infection.
  • In cases of severe reactions, prescription medications or medical intervention may be necessary.

Prognosis and Follow-Up

Most insect bites resolve within a few days to a week with minimal intervention. Follow-up is generally not required unless symptoms worsen, persist, or indicate infection. Patients should monitor for signs of complications and seek care if needed.

Complications

  • Secondary bacterial infection from scratching.
  • Allergic reactions, including anaphylaxis in rare cases.
  • Persistent itching or scarring in sensitive individuals.

Lifestyle & Prevention

  • Wear closed-toe shoes or socks when outdoors, especially in grassy or wooded areas.
  • Use insect repellent and protective clothing to minimize exposure.
  • Avoid walking barefoot in environments with high insect activity.
  • Keep living spaces clean to reduce indoor insect populations.

When to Seek Professional Help

Seek medical attention if symptoms worsen, spread, or show signs of infection (e.g., pus, increased pain, fever). Immediate care is necessary for severe allergic reactions, such as difficulty breathing or swelling of the face or throat.

Tips for Medical Coders

Document the specific location (left foot) and confirm the bite is nonvenomous. Ensure clinical notes support the diagnosis and exclude venomous bites or other conditions. Use this code for initial encounters unless a subsequent encounter is indicated.