ICD-10 Code A49.2 – Hemophilus influenzae infection, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A49.2 – Hemophilus influenzae infection, unspecified site
What it is
This code identifies a Haemophilus influenzae infection when the organism is known but the site is not specified. Use it when documentation confirms H. influenzae infection without a more precise anatomic diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Findings may include signs of bacterial infection such as fever, localized inflammation, or respiratory symptoms, depending on the site involved.
When to use this code
Use A49.2 when the record states H. influenzae infection and does not identify a specific site or organ system. It also applies when the provider documents the organism as the cause of infection, but the location remains unspecified. If a more specific diagnosis is documented, code that condition instead.
Do not use for
Do not use this code for carrier or colonization states, or when the infection site is documented more specifically. Check documentation if the record describes a related respiratory, ear, or other localized infection.
Coding tip
Code the documented site first when available; use A49.2 only when the infection is clearly H. influenzae but the site is not stated.