HIPAA Compliant Patient Data Anonymization Macro

Develop a VBA macro that automatically anonymizes patient records in an Excel spreadsheet while preserving statistical integrity for medical research. The macro must: 1) Randomly replace patient names with unique identifiers, 2) Mask specific demographic data like birthdate and zip code, 3) Maintain data relationships for research purposes, 4) Include error handling for different data formats, and 5) Generate an encrypted audit log of anonymization processes. Provide comprehensive documentation explaining HIPAA compliance mechanisms.