Final answer:
The example provided in the question is an example of unit-serial numbering in the healthcare facility.
Step-by-step explanation:
The example provided in the question, where previous medical records are brought forward and filed under the last assigned number, is an example of unit-serial numbering. In this numbering system, each encounter with the healthcare facility is assigned a unique numerical identifier, which is the unit number. The previous medical records are then filed under the last assigned number, which is the serial number. Using this system helps organize and retrieve medical records efficiently.