HIPAA-Compliant Patient Risk Stratification Query

Design a complex SQL query that anonymizes patient data while creating a risk stratification model for chronic disease progression. The query must use window functions to calculate multi-factor risk scores, implement data masking techniques to protect PHI, and generate a tiered risk classification without exposing individual patient identifiers. Include logic for aggregating comorbidity factors, medication history, and demographic risk weights while maintaining strict HIPAA compliance standards.