ICD-10 Code A30.3 – Borderline Leprosy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A30.3 – Borderline leprosy
What it is
Borderline leprosy is a form of Hansen disease that falls between tuberculoid and lepromatous disease. It reflects an unstable immune response to Mycobacterium leprae.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include multiple skin lesions with mixed characteristics and peripheral nerve involvement, and the pattern may shift over time.
When to use this code
Use this code when the record specifically documents borderline leprosy or borderline Hansen disease. It also fits cases described as borderline disease within the leprosy spectrum, even if the note emphasizes mixed skin and nerve findings.
If the provider only documents leprosy without subtype, check the chart for the exact classification before coding. You should not assume borderline status from severity alone.
Do not use for
Do not use this code for tuberculoid, lepromatous, or indeterminate leprosy when a more specific subtype is documented. Check documentation if the term “borderline” is absent.
Coding tip
Capture the exact leprosy subtype from the provider’s wording; borderline disease is not interchangeable with other forms of Hansen disease.