Q82.1 Xeroderma pigmentosum

Name of the Condition

• Xeroderma pigmentosum

Summary

Xeroderma pigmentosum is a rare genetic disorder characterized by extreme sensitivity to ultraviolet (UV) radiation from sunlight. This condition impairs the body’s ability to repair DNA damage caused by UV exposure, leading to a high risk of skin cancers and other complications. It typically presents in early childhood with skin changes and progresses over time.

Causes

The condition is caused by mutations in genes responsible for nucleotide excision repair, a process that corrects DNA damage from UV light. These genetic defects are inherited in an autosomal recessive pattern, meaning both parents must carry a mutated gene for a child to be affected.

Risk Factors

• Genetic predisposition (autosomal recessive inheritance).
• Family history of xeroderma pigmentosum.
• Lack of protective measures against UV exposure (e.g., sunscreen, clothing).

Symptoms

• Severe sunburn after minimal UV exposure.
• Freckle-like spots or dry, pigmented skin (poikiloderma) on sun-exposed areas.
• Eye irritation, redness, or clouding from UV exposure.
• Increased risk of skin cancers (e.g., melanoma, basal cell carcinoma) at a young age.

Diagnosis

Diagnosis is based on clinical presentation, family history, and specialized tests. These may include DNA repair assays, genetic testing to identify mutations, and skin biopsies to assess cellular damage. Prenatal testing is available for at-risk families.

Treatment Options

• Strict sun avoidance and protective measures (e.g., clothing, sunscreen, UV-blocking windows).
• Regular skin and eye examinations to detect early signs of cancer.
• Surgical removal of precancerous or cancerous lesions.
• Oral retinoids may be used to reduce skin cancer risk in severe cases.

Prognosis and Follow-Up

Prognosis varies depending on the severity of DNA repair defects and adherence to preventive measures. Early detection and rigorous sun protection can improve outcomes, but lifelong monitoring is essential. Regular follow-up with dermatologists and ophthalmologists is recommended.

Complications

• Skin cancers (melanoma, squamous cell carcinoma, basal cell carcinoma) at a young age.
• Eye damage, including corneal ulcers or cataracts.
• Neurological symptoms in some subtypes (e.g., hearing loss, developmental delays).

Lifestyle & Prevention

• Avoid sun exposure, especially during peak hours (10 a.m.–4 p.m.).
• Use broad-spectrum sunscreen (SPF 50+) and wear protective clothing.
• Install UV-blocking film on windows and use UV-protective eyewear.
• Conduct monthly self-exams for skin changes and seek prompt evaluation of new lesions.

When to Seek Professional Help

• Severe sunburn or blistering after minimal UV exposure.
• New or changing moles, sores, or skin discoloration.
• Eye pain, redness, or vision changes after sun exposure.
• Unexplained neurological symptoms (e.g., balance issues, hearing loss).

Tips for Medical Coders

• Code Q82.1 is specific to xeroderma pigmentosum and should be used when the condition is documented. Ensure documentation supports the diagnosis, including genetic testing or clinical findings. Avoid coding for related but distinct conditions (e.g., other DNA repair disorders) without clear differentiation.