how do i stop certain people from getting into my medical business including appt day and time

I am sorry to hear about this. If you do not want the person you listed as your "contact person" to be contacted regarding your medical appointments, then I recommend you remove that contact person from your medical records and do not list them.  If you do not want them to contact anyone, I recommend informing the heath care provider of such and asking them to put a note on your file.  For more information on whether this incident could be a HIPAA violation, I recommend visiting:  http://www.hhs.gov/ocr/privacy/hipaa/complaints/. NOTE:  This response is general in nature and should not be considered legal advice.  No attorney-client relationship exists or is formed by this response.