L43 Lichen planus

Name of the Condition

• Lichen Planus

Summary

Lichen planus is a chronic inflammatory skin condition that can also affect mucous membranes, nails, and hair. It presents with characteristic flat-topped, purple, itchy papules or plaques, often with a lacy pattern on the skin or mucosal surfaces.

Causes

The exact cause of lichen planus is not fully understood, but it is considered an immune-mediated disorder. Triggers may include viral infections (e.g., hepatitis C), certain medications, or contact with allergens. It is not contagious.

Risk Factors

• Middle-aged adults are most commonly affected.
• Presence of other autoimmune conditions.
• Viral infections, particularly hepatitis C.
• Use of certain medications (e.g., NSAIDs, beta-blockers, antimalarials).

Symptoms

• Purple, flat-topped bumps or lesions on the skin, often with a shiny surface.
• Intense itching, which can be persistent.
• Oral lesions that may cause burning or pain.
• Nail changes (e.g., ridges, thinning) or hair loss in some cases.

Diagnosis

Diagnosis is typically made through a physical examination of the skin and mucous membranes. A biopsy of affected tissue may be performed to confirm the diagnosis by examining characteristic histological changes under a microscope. Blood tests may be used to rule out associated conditions or infections.

Treatment Options

• Topical corticosteroids to reduce inflammation and itching.
• Antihistamines for symptom relief.
• Phototherapy or oral medications for severe or widespread cases.
• Retinoids or immune-suppressing agents for persistent or refractory disease.

Prognosis and Follow-Up

Lichen planus may resolve spontaneously within months to a few years, but some cases become chronic. Regular follow-up is important to monitor for recurrence or complications, such as scarring or mucosal involvement.

Complications

• Post-inflammatory hyperpigmentation or scarring.
• Oral or genital mucosal involvement, which may cause discomfort.
• Nail dystrophy or permanent hair loss in severe cases.

Lifestyle & Prevention

• Avoid known triggers or allergens.
• Use gentle skin care products to avoid irritation.
• Protect skin from excessive sun exposure, which may worsen symptoms.
• Maintain good oral hygiene if mucosal involvement is present.

When to Seek Professional Help

Seek medical attention if symptoms worsen, new lesions appear, or if there is severe itching, pain, or signs of infection. Prompt evaluation is recommended for mucosal involvement or nail changes.

Tips for Medical Coders

When coding for lichen planus (L43), ensure documentation specifies the site (e.g., skin, oral mucosa) and any associated complications. Note whether the condition is acute or chronic, as this may impact coding specificity. Verify that the diagnosis aligns with clinical findings and exclude other similar dermatological conditions.