Final answer:
A numeric filing system organizes records by the person's last name and may include portions of the patient's SSN. It is commonly used in healthcare practices but not when patient confidentiality is crucial.
Step-by-step explanation:
A numeric filing system organizes records according to the person's last name and may include portions of the patient's SSN. It is the most commonly used filing system in healthcare practices. However, it is not used when patient confidentiality is especially important as it can compromise privacy.