ICD-10 Code A90 – Dengue fever [classical dengue] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A90 – Dengue fever [classical dengue]
What it is
A90 identifies dengue fever, a mosquito-borne viral illness often called classical dengue. Use it for uncomplicated dengue infection when the record documents dengue fever without warning signs or severe complications.
Clinical signs
Typical findings include acute fever, headache, pain behind the eyes, muscle or joint pain, rash, and general malaise. Clinical features vary; refer to documentation for confirmation of dengue fever.
When to use this code
Use A90 when the provider documents dengue fever or classical dengue as the final diagnosis. Apply it for confirmed or clinically diagnosed uncomplicated dengue cases, including outpatient or inpatient encounters, when no hemorrhagic or severe form is stated.
If the chart only says suspected dengue, check documentation for a confirmed diagnosis before coding. When the record specifies a more severe dengue presentation, do not default to A90.
Do not use for
Do not use A90 for dengue hemorrhagic fever, dengue shock syndrome, or other severe dengue forms. Also avoid it when the note documents only suspected exposure or an unspecified febrile illness.
Coding tip
Code A90 only when the provider clearly documents dengue fever; if the wording is vague, check documentation.