B27.80
BillableOther infectious mononucleosis without complication
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is B27.80 an HCC code?
No. B27.80 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
B27.80 is the ICD-10-CM diagnosis code for other infectious mononucleosis without complication. Infectious mononucleosis caused by a virus other than Epstein-Barr virus or cytomegalovirus, such as human herpesvirus 6, presenting without complications. B27.80 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other viral diseases (b25-b34).
B27.80 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 when the causative agent is identified but is not EBV or CMV.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for B27.80 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code when the causative agent is identified but is not EBV or CMV
- •Document the specific viral agent identified in testing to support accurate coding