A39.0
BillableMeningococcal meningitis
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is A39.0 an HCC code?
No. A39.0 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
A39.0 is the ICD-10-CM diagnosis code for meningococcal meningitis. A serious bacterial infection caused by Neisseria meningitidis that inflames the protective membranes surrounding the brain and spinal cord. This is a life-threatening condition requiring immediate medical treatment. A39.0 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other bacterial diseases (a30-a49).
A39.0 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 requires documentation of meningococcal infection with meningitis; verify the organism is confirmed as Neisseria meningitidis before coding.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A39.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code requires documentation of meningococcal infection with meningitis; verify the organism is confirmed as Neisseria meningitidis before coding
- •Check for additional codes needed for complications such as sepsis (A39.4), meningococcemia, or other manifestations that may be present