G52.0
BillableDisorders of olfactory nerve
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is G52.0 an HCC code?
No. G52.0 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
G52.0 is the ICD-10-CM diagnosis code for disorders of olfactory nerve. Problems with the olfactory nerve that affect the sense of smell, including loss of smell or distorted smell perception. G52.0 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering nerve, nerve root and plexus disorders (g50-g59).
G52.0 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.
Document whether anosmia (complete loss of smell) or hyposmia (reduced smell) is present.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for G52.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document whether anosmia (complete loss of smell) or hyposmia (reduced smell) is present
- •Consider underlying causes such as viral infection, head trauma, or nasal obstruction that may need separate coding