ICD-10 Code A27.9 – Leptospirosis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A27.9 – Leptospirosis, unspecified
What it is
A27.9 identifies leptospirosis when the record confirms the infection but does not specify the clinical form or organism details. Use it for an unspecified Leptospira infection.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include acute febrile illness, headache, myalgias, and sometimes jaundice, conjunctival suffusion, or renal involvement.
When to use this code
Use A27.9 when the provider documents leptospirosis but does not name a specific type, such as Weil disease or another defined presentation. It also fits when the note confirms infection and further detail is unavailable. Check documentation if the chart mentions exposure, serology, or organ involvement without a more specific diagnosis.
Do not use for
Do not use this code if the record identifies a more specific leptospirosis code or a different infectious cause. Do not assign it for mere exposure, suspected disease, or ruled-out infection.
Coding tip
Code the highest level of specificity supported by the provider note; if the type is not stated, A27.9 is appropriate.