A91 ICD-10-CM Code: Dengue hemorrhagic fever
A91 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Arthropod-borne viral fevers and viral hemorrhagic fevers (A90-A99)
A91
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceDengue hemorrhagic fever
Dengue hemorrhagic fever is a severe form of dengue infection transmitted by mosquitoes, characterized by bleeding, low platelet counts, and potentially life-threatening complications. It occurs when a person is infected with dengue virus a second time, typically with a different strain than their initial infection.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for A91. Check the code and parent instructions in the Code Book.
Excludes 2
Official- carrier or suspected carrier of infectious disease (Z22.-)Inherited from A00-B99
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)Inherited from A00-B99
- infectious and parasitic diseases specific to the perinatal period (P35-P39)Inherited from A00-B99
- influenza and other acute respiratory infections (J00-J22)Inherited from A00-B99
Related Codes
No related codes are included in this display for A91. Check the Code Book for the complete code path.
Includes
Official- diseases generally recognized as communicable or transmissibleInherited from A00-B99
Excludes 1
Official- certain localized infections - see body system-related chaptersInherited from A00-B99
Code First
OfficialNo Code First sequencing instructions are included in this display for A91. Check the code and parent instructions in the Code Book.
Use Additional
Official- code to identify resistance to antimicrobial drugs (Z16.-)Inherited from A00-B99
Code Also
OfficialNo Code Also instructions are included in this display for A91. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is A91 an HCC code?
No. A91 is a billable ICD-10-CM code with no mapping under the current CMS-HCC V28 community payment model, and none under the ESRD, Part D RxHCC, or HHS-HCC models.
- Code
- A91
- Description
- Dengue hemorrhagic fever
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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What This Code Means
A91 is the ICD-10-CM diagnosis code for dengue hemorrhagic fever. Dengue hemorrhagic fever is a severe form of dengue infection transmitted by mosquitoes, characterized by bleeding, low platelet counts, and potentially life-threatening complications. It occurs when a person is infected with dengue virus a second time, typically with a different strain than their initial infection. A91 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).
A91 is a billable ICD-10-CM code, but no current CMS-HCC V28 community payment mapping is shown, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.
Verify documentation clearly states 'dengue hemorrhagic fever' or 'DHF' to distinguish from uncomplicated dengue fever (A90), as hemorrhagic manifestations are required for this code.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for A91 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify documentation clearly states 'dengue hemorrhagic fever' or 'DHF' to distinguish from uncomplicated dengue fever (A90), as hemorrhagic manifestations are required for this code
- •This code includes dengue shock syndrome; do not assign additional codes for shock unless the documentation specifies a different type of shock unrelated to the dengue infection