Why is Dr. Lenite unable to edit the letter he wrote earlier today?

The reason Dr. Lenite is unable to edit the letter he wrote earlier today is because he clicked "Send Now." When a letter is sent, it typically becomes finalized and locked to prevent any further modifications. This action indicates that the communication is complete and ready to be delivered to the recipient.

In many electronic health record systems, like EpicCare, once a letter is sent, it can no longer be altered to maintain the integrity of the communication. This is essential in clinical settings where documentation needs to be accurate and accountable once shared. Thus, clicking "Send Now" ensures that the content is conveyed as intended without any further changes.