Final answer:
The piece of mail that should be placed on top when sorting the physician's mail is the one that requires immediate attention or is most urgent.
Step-by-step explanation:
When sorting the physician's mail, the piece of mail that should be placed on top is typically the mail that requires immediate attention or is most urgent. This could include items such as test results, patient referrals, or important correspondence from other medical professionals. By prioritizing these items and placing them on top, the physician can ensure that they are dealt with promptly.
However, it's important to note that the specific process of sorting mail may vary from one physician's office to another. Some offices may have established protocols or systems in place for handling different types of mail. Therefore, it's always a good idea for the physician or their office staff to communicate and clarify any specific guidelines for mail sorting.
In summary, the piece of mail that should be placed on top when sorting the physician's mail is the one that requires immediate attention or is most urgent.