Domain slamming is a common scam that attempts to trick people into transferring ownership of their domain name. If you receive a letter or email notifying you that your domain name registration is set to expire, do not take any action unless you can confirm that the reminder is legitimate.
If your domain name was registered by Vision Source through Avelient's FlexSite program, ignore the notice. Your domain name is managed by Vision Source, so you will not receive any expiration reminders.
If your domain name was registered by the practice, it is highly unlikely that a real reminder would be sent by mail. If the notice was sent by email, ensure that it was sent by the company where the domain name was originally purchased.
If you are still unsure, read the notice carefully, including any fine print. An attempt at domain slamming will often include language that indicates it is not a bill, but a domain transfer.