A unit numbering system requires the retrieval of a patient's record from multiple locations in the filing system when previous records are requested by a physician.

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In a unit numbering system, each patient is assigned a unique number, and all records for that patient, regardless of the number of visits or the type of service, are filed under this single number. This means that all of a patient's records are kept together in one location, making it easier to retrieve all records at once without the need to go to multiple locations.

A Unit Numbering System Requires the Retrieval of a Patient's