ICD-10 Code A27 – Leptospirosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A27 – Leptospirosis
What it is
A27 identifies leptospirosis, a bacterial infection caused by Leptospira organisms. It is usually acquired through contact with contaminated water, soil, or animal urine.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include fever, headache, muscle pain, and sometimes eye redness, jaundice, or kidney involvement in more severe disease.
When to use this code
Use A27 when the provider documents leptospirosis as the confirmed diagnosis. It also fits cases where the chart clearly identifies Leptospira infection, even if the exact exposure source is not stated. Check documentation for any associated organ complications that may need additional coding.
Do not use for
Do not use A27 for mere exposure, screening, or suspected infection without confirmation. Do not use it when the record documents a different infectious cause or only a complication without naming leptospirosis.
Coding tip
Verify the organism and final diagnosis in the provider note before assigning A27.