Answer: The HIPAA Privacy and Security Rules are enforced by the Office for Civil Rights (OCR). View more information about complaints related to concerns about protected health information. The Office of E-Health Standards and Services within the Centers for Medicare & Medicaid Services (CMS) enforces the Transactions and Code Sets and National Identifiers (Employer and Provider identifiers) regulations of the Health Insurance Portability and Accountability Act (HIPAA). Complaints regarding the Transactions and Code Sets and National Identifiers regulations may be submitted electronically or via paper form. CMS also enforces the insurance portability requirements under Title I of HIPAA. View more information about portability and how to obtain information or assistance.