The Amerimmune Clinic is no longer accepting new patients. CONTACT US. Phone: 571.308.1900. Fax: 571.308.1919. eMail for Appointments: clinic.scheduling@amerimmune.com eMail for Billing: clinic.billing@amerimmune.com eMail for Other Questions: clinic.info@amerimmune.com Monday to Friday 9:00 AM - 12:00 PM & 1:00 PM - 4:00 PM.