HIPAA Audit Logging Requirements: What to Log, How to Protect It, and Why It Matters in an Investigation

HIPAA's audit control requirement (45 CFR 164.312(b)) is exactly one sentence long: "Implement hardware, software, and/or procedural mechanisms that record and examine activity in information systems that contain or use electronic protected health information." That's it. No specifics on what to log, how long to keep it, or what format to use. This is by design -- HIPAA is technology-neutral and scales from solo dental practices to massive hospital networks. But it means the implementation details are on you. Here's what actually matters when building audit logging for HIPAA-covered systems. What You Need to Log Authentication Events Successful logins (user, timestamp, source IP, device identifier) Failed login attempts (especially important for detecting brute force attacks) Password changes and resets MFA enrollment and verification events Session creation and termination Account lockouts PHI Access Events This is the most critical category and where most systems fall short: Record-l