A92.1 ICD-10-CM Code: O'nyong-nyong fever
HCC Buddy Code Card
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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)
A92.1
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceO'nyong-nyong fever
O'nyong-nyong fever is a viral infection transmitted by mosquitoes that causes joint pain, fever, and rash, primarily occurring in Africa. The name means 'breaking bones' in the local language, referring to the severe joint pain patients experience.
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
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for A92.1 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A92.1 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A92.1 in this effective period.
Excludes 1
Official- Ross River disease (B33.1)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A92.1 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A92.1 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A92.1 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 A92.1 an HCC code?
No. A92.1 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
A92.1 is the ICD-10-CM diagnosis code for o'nyong-nyong fever. O'nyong-nyong fever is a viral infection transmitted by mosquitoes that causes joint pain, fever, and rash, primarily occurring in Africa. The name means 'breaking bones' in the local language, referring to the severe joint pain patients experience. A92.1 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).
A92.1 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.
This code is used for confirmed cases of O'nyong-nyong fever; ensure documentation specifies this diagnosis rather than other similar arboviral infections like dengue or chikungunya.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A92.1 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code is used for confirmed cases of O'nyong-nyong fever; ensure documentation specifies this diagnosis rather than other similar arboviral infections like dengue or chikungunya
- •Code A92.1 is specific to O'nyong-nyong fever and should not be confused with other fever codes in the A92 category; verify the causative virus is identified in the medical record