HIPAA-Compliant Patient Risk Stratification Query

Design a complex SQL query that anonymizes patient data while creating a comprehensive risk stratification model for chronic disease management. The query must aggregate medical history, current medication, lab results, and demographic information without exposing personally identifiable information. Implement advanced window functions to calculate risk scores, ensuring each patient receives a dynamic risk classification that updates in real-time. Include explicit data masking techniques that maintain HIPAA compliance and provide a clear audit trail for medical professionals.