A94 ICD-10-CM Code: Unspecified arthropod-borne viral fever
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)
A94
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceUnspecified arthropod-borne viral fever
This code describes a fever caused by a virus transmitted through insect bites (such as mosquitoes or ticks) when the specific type of virus cannot be identified. It's used when a patient has symptoms of an arthropod-borne viral infection but the exact virus hasn't been determined.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
Basket needed
Code Book Path
Inclusion Terms
Official- Arboviral fever NOS
- Arbovirus infection NOS
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A94 in this effective period.
Related Child Codes
ICD-10-CM does not list child codes under A94 for this display context.
Includes
OfficialICD-10-CM does not list Includes notes for A94 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A94 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A94 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A94 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A94 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 A94 an HCC code?
No. A94 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
Get the V28 RAF + MEAT cheat sheet
One printable page: confirm a code's V28 HCC status, its RAF weight, and the MEAT your note needs to make it stick. Free, no card.
Free PDF. No card. Unsubscribe anytime.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A94 is the ICD-10-CM diagnosis code for unspecified arthropod-borne viral fever. This code describes a fever caused by a virus transmitted through insect bites (such as mosquitoes or ticks) when the specific type of virus cannot be identified. It's used when a patient has symptoms of an arthropod-borne viral infection but the exact virus hasn't been determined. A94 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).
A94 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.
Use this code only when the specific arthropod-borne virus (like dengue, Zika, or West Nile) cannot be identified; if the specific virus is known, use the more specific code instead.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A94 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the specific arthropod-borne virus (like dengue, Zika, or West Nile) cannot be identified; if the specific virus is known, use the more specific code instead
- •This is an unspecified code, so documentation should reflect that the exact viral etiology was not determined or confirmed during the encounter