A useful audit log in healthcare software records who did what, to which record, when, and from where — for both human and automated actions — in a structure that can answer real operational and compliance questions quickly. This guide covers event design, immutability, access logging, and the reporting layer that turns raw logs into answers.
Log actions, not just changes
Database change history is not an audit trail. Viewing a record is an event worth logging in healthcare contexts even though nothing changed. Design events around actions: viewed, searched, exported, assigned, approved, overrode. Include the actor, subject record, timestamp, and origin.
Automated actions are actors too
When an AI pipeline classifies a document or a workflow rule routes an item, log it with the same discipline as a human action — including the system version that made the decision. Mixed human-and-automation histories are exactly what reviewers and auditors need to see.
Plan the questions before the schema
Good audit design starts from the questions that will be asked: who accessed this patient-related record this quarter, what changed on this claim item, why did this document route where it did. If your log structure cannot answer those in one query, restructure it now rather than during an audit.
This article covers software engineering and operational practice. It is not clinical, legal, or compliance advice.