ICD-10 Code A48.2 – Nonpneumonic Legionnaires’ disease [Pontiac fever] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A48.2 – Nonpneumonic Legionnaires’ disease [Pontiac fever]
What it is
A48.2 identifies Pontiac fever, a Legionella infection that causes an acute flu-like illness without pneumonia. Use it when documentation specifically names nonpneumonic Legionnaires’ disease or Pontiac fever.
Clinical signs
Clinical features vary; refer to documentation. Typical notes describe fever, headache, muscle aches, and fatigue, with no evidence of pneumonia on evaluation.
When to use this code
Use A48.2 when the provider documents Pontiac fever or nonpneumonic Legionnaires’ disease. It is appropriate when the record shows a Legionella-related illness but does not document pneumonia. Check the chart for supporting clinical wording and avoid assuming the diagnosis from exposure alone.
Do not use for
Do not use this code for Legionnaires’ disease with pneumonia, which is coded separately. Also avoid it when the diagnosis is only suspected or when documentation is limited to a nonspecific febrile illness.
Coding tip
Code only when the provider clearly links the illness to Pontiac fever or nonpneumonic Legionella infection.