A90 ICD-10-CM Code: Dengue fever [classical dengue]
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Arthropod-borne viral fevers and viral hemorrhagic fevers (A90-A99)
A90
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceDengue fever [classical dengue]
Dengue fever is a viral infection spread by mosquitoes that causes fever, headache, muscle and joint pain, and rash. It is also known as classical dengue and is typically a self-limiting illness that resolves within a week or two.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for A90 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A90 in this effective period.
Related Child Codes
ICD-10-CM does not list child codes under A90 for this display context.
Includes
OfficialICD-10-CM does not list Includes notes for A90 in this effective period.
Excludes 1
Official- dengue hemorrhagic fever (A91)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A90 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A90 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A90 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is A90 an HCC code?
No. A90 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A90 is the ICD-10-CM diagnosis code for dengue fever [classical dengue]. Dengue fever is a viral infection spread by mosquitoes that causes fever, headache, muscle and joint pain, and rash. It is also known as classical dengue and is typically a self-limiting illness that resolves within a week or two. A90 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering arthropod-borne viral fevers and viral hemorrhagic fevers (a90-a99).
A90 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
A90 is used for uncomplicated dengue fever; if the patient develops severe dengue (dengue hemorrhagic fever or dengue shock syndrome), use codes A91 instead.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A90 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •A90 is used for uncomplicated dengue fever; if the patient develops severe dengue (dengue hemorrhagic fever or dengue shock syndrome), use codes A91 instead
- •This code does not require a fifth character; document the clinical presentation and any complications to ensure accurate coding and appropriate severity assessment
Excludes 1, Do NOT code together
- dengue hemorrhagic fever (A91)