ICD-10 Code B55.9 – Leishmaniasis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B55.9 – Leishmaniasis, unspecified
What it is
B55.9 identifies leishmaniasis when the type is not further specified in the record. It is used for a parasitic infection caused by Leishmania species, but the documentation does not name a cutaneous, mucocutaneous, or visceral form.
Clinical signs
Clinical features vary; refer to documentation. Leishmaniasis may present with skin lesions, mucosal involvement, fever, weight loss, or enlarged spleen and liver, depending on the form and site of infection.
When to use this code
Use B55.9 when the provider documents leishmaniasis but does not specify the clinical form or anatomic site. It also fits when the chart confirms the infection, yet the note lacks enough detail for a more specific leishmaniasis code. If later documentation identifies the subtype, you should code that more specific form instead.
Do not use for
Do not use this code when the record clearly identifies cutaneous, mucocutaneous, or visceral leishmaniasis. Check documentation if the diagnosis is only suspected, ruled out, or described as a history of infection.
Coding tip
Query the provider for the leishmaniasis type whenever the record is vague, because a more specific code may be available.