psychology practice - billing - prepare statements from appointment book - is a package or addon available (Macintosh)?

Hello --
I am helping a psychologist friend (using a Mac) find an application that maintains a schedule of patient visits and prepares monthly billing statements from that schedule.
Can anyone tell me if there is such a package or add-on, utility, technique, etc. for this purpose, or for just the billing portion?
I might be able to talk her into buying the Intel-based Mac so that she would have Windows-based packages from which to choose. That should expand the range of possibilities.
Are there other sources to post this question or search for responses?
Thanks in advance for any help.
Larry Mehl
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