Z20.7 Contact with and (suspected) exposure to pediculosis, acariasis and other infestations

Name of the Condition

• Contact with and (suspected) exposure to pediculosis, acariasis and other infestations (ICD-10 Z20.7)

Summary

This code is used for individuals who have had contact with or are suspected of being exposed to pediculosis (lice infestation), acariasis (mite infestation), or other parasitic infestations. It does not confirm an active infestation but indicates potential exposure requiring monitoring or preventive action.

Causes

The situation arises from close proximity to an individual with an active infestation or exposure to environments where such parasites are present. These infestations are spread through direct contact, shared personal items, or contaminated surfaces.

Risk Factors

• Risk factors include close contact with someone with an active infestation, living or working in crowded settings, sharing personal items (e.g., clothing, bedding), and poor hygiene practices.

Symptoms

• Exposure itself may not cause immediate symptoms, but if an infestation occurs, symptoms vary by the parasite and can include itching, skin irritation, visible bites, or presence of the parasite or its eggs.

Diagnosis

Diagnosis of exposure is typically based on patient history and potential contact with an infested individual or environment. Visual inspection or microscopic examination of skin, hair, or clothing may be performed to assess for active infestation.

Treatment Options

• Management depends on the specific infestation and exposure risk. Preventive measures (e.g., washing bedding, avoiding shared items) may be recommended, and active infestations are treated with topical or oral medications.

Prognosis and Follow-Up

With appropriate treatment, most infestations resolve without long-term issues. Follow-up may involve rechecking for signs of infestation or recurrence, especially in shared living environments.

Complications

• Complications are rare but can include secondary skin infections from scratching or persistent itching. Severe infestations may cause discomfort or social distress.

Lifestyle & Prevention

• Preventive measures include avoiding direct contact with infested individuals, not sharing personal items, and maintaining good hygiene. Regularly washing clothing and bedding can reduce risk.

When to Seek Professional Help

• Seek medical attention if symptoms of an active infestation develop (e.g., persistent itching, visible parasites) or if exposure is suspected in a high-risk setting.

Tips for Medical Coders

• Use this code when documenting contact with or suspected exposure to pediculosis, acariasis, or other parasitic infestations. Ensure documentation supports the exposure history, as the code does not indicate an active infestation.