N31.8
BillableOther neuromuscular dysfunction of bladder
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is N31.8 an HCC code?
No. N31.8 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
N31.8 is the ICD-10-CM diagnosis code for other neuromuscular dysfunction of bladder. Various other types of bladder dysfunction caused by nerve or muscle problems that don't fit into the standard categories. N31.8 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering other diseases of the urinary system (n30-n39).
N31.8 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 type of neuromuscular dysfunction is documented but doesn't match N31.1 or N31.2.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for N31.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.