ICD-10 Code A21.9 – Tularemia, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A21.9 – Tularemia, unspecified
What it is
A21.9 identifies tularemia when the documentation does not specify a particular form or site. Use it for a confirmed or suspected tularemia diagnosis that is recorded only as “unspecified.”
Clinical signs
Clinical features vary; refer to documentation. Tularemia may present with fever, localized skin or ulcerative lesions, lymph node enlargement, or respiratory symptoms depending on exposure and disease form.
When to use this code
Use A21.9 when the provider documents tularemia but does not identify ulceroglandular, pneumonic, typhoidal, or another specific type. It also fits cases where the note simply states “tularemia” without further detail. Check documentation if the record supports a more specific code.
Do not use for
Do not use this code if the chart specifies a particular tularemia manifestation or a different infectious diagnosis. Also avoid it when tularemia is only being ruled out or is not documented clearly.
Coding tip
If the provider names a specific tularemia form, code that detail instead of A21.9.