Database normalization refers to keeping only one copy of the information in your database. So, social history is just one copy .. unless you put the social history into an encounter which does then violate this principle.
Thinking more about this, it's not just past medical history we are talking about, but more about disease management. The encounters document day to day management, but there needs to be a place for documenting strategic management of chronic diseases as well.
The diagnostic lists are really aide-memoire, and for generating ICD-9s for billing.
Perhaps it will be a subtab for Diagnoses.
Graham Chiu
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