B86 Scabies

Name of the Condition

• Scabies

Summary

Scabies is a contagious skin infestation caused by the Sarcoptes scabiei mite. It is characterized by intense pruritus (itching) and a papular rash, often affecting areas with thin skin such as the wrists, between fingers, and genital region. The condition spreads through close personal contact and can occur in individuals of all ages, though outbreaks are common in crowded or institutional settings.

Causes

Scabies is caused by the Sarcoptes scabiei mite, a microscopic parasite that burrows into the upper layer of the skin to lay eggs. Transmission occurs through direct skin-to-skin contact with an infested individual, as the mites can survive briefly on surfaces like bedding or clothing. The infestation triggers an allergic reaction, leading to the characteristic itching and rash.

Risk Factors

• Close contact with an infested person, including household members or sexual partners.
• Living in crowded conditions, such as nursing homes, prisons, or refugee camps.
• Weakened immune systems, which may increase susceptibility to severe or crusted (Norwegian) scabies.
• Lack of access to hygiene resources or clean living environments.

Symptoms

• Intense, persistent itching that worsens at night.
• Small, raised bumps or pustules, often in clusters or linear tracks.
• Rash typically appearing on the hands, feet, wrists, elbows, armpits, or genital area.
• Secondary bacterial infections from scratching.

Diagnosis

Diagnosis is typically based on clinical presentation, including the characteristic rash and itching. A healthcare provider may confirm the diagnosis by examining skin scrapings under a microscope to identify mites, eggs, or fecal matter. In some cases, dermoscopy or skin biopsy may be used to rule out other conditions.

Treatment Options

• Topical scabicides, such as permethrin or ivermectin cream, applied to the entire body.
• Oral medications like ivermectin for severe or widespread infestations.
• Antihistamines to relieve itching.
• Washing or drying-clean all clothing, bedding, and personal items in hot water.

Prognosis and Follow-Up

With appropriate treatment, scabies typically resolves within 2-4 weeks. Itching may persist for several weeks due to an ongoing allergic reaction. Follow-up is recommended to ensure complete eradication, especially in cases of reinfestation or treatment failure. Household members and close contacts should be treated simultaneously to prevent spread.

Complications

• Bacterial skin infections from scratching, such as impetigo.
• Crusted scabies (Norwegian scabies) in immunocompromised individuals, which can be severe and highly contagious.
• Secondary infections requiring antibiotic treatment.

Lifestyle & Prevention

• Avoid close contact with infested individuals until treatment is complete.
• Wash all clothing, bedding, and towels in hot water and dry on high heat.
• Vacuum furniture and carpets, and dispose of vacuum bags.
• Practice good hygiene, including regular handwashing.

When to Seek Professional Help

Seek medical attention if itching persists after treatment, if new rashes appear, or if signs of infection (e.g., pus, fever) develop. Infestations in infants, elderly, or immunocompromised individuals should be evaluated promptly.

Tips for Medical Coders

Document the clinical findings, including the presence of mites or characteristic rash, to support the diagnosis. Note any associated complications or treatment regimens, as these may impact coding specificity. Ensure documentation aligns with the ICD-10-CM guidelines for scabies (B86) and any related codes for complications.