ICD-10 Code B46.3 – Cutaneous mucormycosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B46.3 – Cutaneous mucormycosis
What it is
B46.3 identifies a fungal infection of the skin caused by Mucorales organisms. Use it when documentation specifically states cutaneous mucormycosis or a skin infection due to mucormycosis.
Clinical signs
Typical findings include painful skin lesions, swelling, and necrotic or blackened tissue at the affected site. Clinical features vary; refer to documentation.
When to use this code
Use B46.3 when the provider documents cutaneous mucormycosis, including primary skin involvement or spread to the skin from another source. Code it when the record supports a mucormycosis diagnosis affecting the skin; check documentation if the site is unclear.
Do not use for
Do not use this code for noncutaneous mucormycosis, such as pulmonary or rhinocerebral disease. Do not assign it for unspecified fungal skin infections unless mucormycosis is documented.
Coding tip
Verify that the record names mucormycosis and the skin site before assigning B46.3.