B43.8
Other forms of chromomycosis
Clinical Classification Guidelines
Medical Intelligence & Overview
Chromomycosis, also known as chromoblastomycosis, is a chronic fungal infection of the skin and subcutaneous tissue. It is caused by certain types of pigmented fungi that enter the body through skin wounds or cuts. The condition typically develops in tropical and subtropical regions and presents as slowly enlarging skin lesions. The ICD-10 code B43.8 refers to other forms of chromomycosis that do not fall into specific subcategories but share similar characteristics and treatment approaches.
Causes & Symptoms
Clinical Causes: Infection by pigmented fungi such as Fonsecaea pedrosoi, Cladophialophora carrionii, and other related species. Entry of fungi into the skin through cuts, puncture wounds, or minor abrasions, often caused by soil, plants, or organic matter. Occupational exposure, especially among agricultural workers, gardeners, and individuals involved in activities that involve soil and plant contact. Environmental factors, notably residing in or traveling to tropical and subtropical regions where these fungi are prevalent. Potential immune system factors that may make some individuals more susceptible to infection.
Key Symptoms: Slowly enlarging, painless skin lesions that may appear as: Papules (small, raised bumps) Plaques (flat, raised areas) Nodules (larger, rounded bumps) Lesions may develop a verrucous (warty) surface or appear crusted and ulcerated. Color changes in the affected skin, often brown, black, or verrucous in appearance. In chronic stages, lesions can become widespread, affecting larger areas of the skin. Possible secondary bacterial infection leading to additional redness, swelling, or pus.
Diagnostic & Treatment
Diagnosis Path: Detailed medical history focusing on exposure to soil or organic matter in endemic regions. Physical examination of skin lesions to assess their appearance and distribution. Microscopic examination of skin scrapings or biopsies to identify characteristic sclerotic (medlar-shaped) cells called medlar bodies. Fungal cultures to isolate and identify the causative organism. Histopathological studies to differentiate from other skin conditions. Imaging studies like X-rays if deeper tissue involvement is suspected.
Treatment Protocols: Antifungal medications such as itraconazole or terbinafine are commonly used to treat chromomycosis. Topical antifungal agents may be applied to smaller, localized lesions. Cryotherapy (freezing therapy) or surgical excision may be considered for resistant or larger lesions. Photodynamic therapy has been explored as an alternative treatment in some cases. Management may also include addressing secondary bacterial infections or other complications. Long-term treatment plans are often necessary, sometimes spanning several months to prevent recurrence.
Clinical Advice & FAQs
Billing Guidance
Is B43.8 a billable ICD-10 code?
Yes, B43.8 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report B43.8?
Clinical documentation must specify the nature of Other forms of chromomycosis and any associated comorbidities for accurate reporting.
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