A90: Dengue fever [classical dengue]

A90 refers to Dengue fever [classical dengue], a viral infection transmitted by mosquitoes or other arthropods, often associated with outbreaks in tropical and subtropical regions. These illnesses can range from mild febrile conditions to severe hemorrhagic or neurologic syndromes. Accurate use of this ICD10 code supports diagnosis, monitoring, treatment planning, and global surveillance efforts.

Symptoms

• High fever – Rapid onset and may last for several days
• Headache – Especially behind the eyes, common in dengue
• Muscle and joint pain – Intense body aches, often called "breakbone fever"
• Skin rash – Typically appears a few days after fever starts
• Nausea and vomiting – Frequently reported symptoms
• Bleeding – Gums, nose, or under the skin in hemorrhagic fevers
• Fatigue – Lingering weakness even after fever subsides

Diagnosis

Diagnosis of Dengue fever [classical dengue] is based on clinical presentation and exposure history, particularly travel to or residence in endemic areas. Laboratory tests include PCR for viral RNA detection, NS1 antigen tests for dengue, and serologic assays for IgM/IgG antibodies. Hematological profiles may show thrombocytopenia or elevated hematocrit, especially in hemorrhagic forms. Early diagnosis is crucial to prevent severe complications.

ICD10 Code Usage

ICD10 code A90 is used in healthcare systems worldwide for accurate documentation, billing, and epidemiological tracking of arthropod-borne and viral hemorrhagic fevers. These codes help classify cases during outbreaks, support insurance claims, and contribute to national and global health databases for infectious disease monitoring and response planning.

Related Codes

• A91 – Dengue hemorrhagic fever
• A92 – Other mosquito-borne viral fevers
• A93 – Other arthropod-borne viral fevers, not elsewhere classified
• A94 – Unspecified arthropod-borne viral fever
• A95 – Yellow fever
• A96 – Arenaviral hemorrhagic fever
• A98 – Other viral hemorrhagic fevers, not elsewhere classified
• A99 – Unspecified viral hemorrhagic fever

FAQs

Q1: What is ICD10 code A90?
A: It is a diagnostic code used to classify Dengue fever [classical dengue] in patient records and health systems.

Q2: Are these diseases contagious?
A: They are not spread from person to person but transmitted by mosquito or vector bites.

Q3: Is there a vaccine available?
A: Yes, for some conditions like yellow fever and dengue (in specific populations), vaccines exist.

Q4: How are these conditions treated?
A: Treatment is usually supportive, focusing on hydration, fever control, and managing complications.

Q5: Are these diseases fatal?
A: Some, especially hemorrhagic fevers, can be fatal without timely medical care.

Conclusion

ICD10 code A90 is essential for diagnosing and managing Dengue fever [classical dengue], especially during outbreaks and in travel medicine. Proper coding enables accurate data collection, guides treatment protocols, and supports public health interventions across regions affected by vector-borne or hemorrhagic viral illnesses.