From an informative marketing blog Definet:
Courting a new customer costs anywhere between five to ten times the cost of retaining an existing one, and 80% of a company’s future revenue comes from just 20% of the existing customer base.
via Definet Contact — Total Marketing Solution.
The article recommends we stay in touch with existing patients with e-mail, blogs, loyalty programs specials and more.
For help with all aspects of patient communications check out my friends at Sesame Communications. In addition for specific help re-activating patients who have not returned in a while Action Run has a unique program to find and contact inactive patients.