ICD-10 Code B42.1 – Lymphocutaneous sporotrichosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B42.1 – Lymphocutaneous sporotrichosis
What it is
B42.1 identifies the lymphocutaneous form of sporotrichosis, a fungal infection that usually starts in the skin and spreads along nearby lymphatic channels. Use it when documentation specifies this pattern.
Clinical signs
Typical findings include a skin lesion at the entry site, followed by nodules or ulcers tracking up the affected limb. Clinical features vary; refer to documentation.
When to use this code
Use B42.1 when the provider documents lymphocutaneous sporotrichosis, sporotrichosis with lymphatic spread, or a confirmed cutaneous infection extending along lymph vessels. This code fits cases described as nodular lymphangitis due to Sporothrix. Check documentation if the site or form is unclear.
Do not use for
Do not use this code for pulmonary, disseminated, or unspecified sporotrichosis. Also avoid it when the record only says “fungal skin infection” without identifying sporotrichosis.
Coding tip
Code the specific clinical form documented; if the lymphocutaneous pattern is not stated, query for clarification before assigning B42.1.