Silla Sumerlin, ACNP provides care to patients in the Cass Health Emergency Department and as a hospitalist in our Inpatient Services department. Silla delivers high-quality care to patients with acute and critical conditions.. Silla has 20 years of experience as an advanced practice provider in emergency and critical care. Silla graduated from Vanderbilt University with her Acute Care Nurse Practitioner degree in 2004.