Find a Doctor

Our Team

Home  /  Our Team

Our Physicians & Physician Assistant

Click on the photo to learn more about Nephrology and Hypertension Specialists doctors.

Alexis Argoudelis, MD
Juan Garcia, MD
Lissa Lopez-Concagh, MD
Danijela Mataic, MD

Temporarily out of office

John Mellas, MD
Jane Cridland, MPAS, PA-C

Our Nurses

Jennifer Chaffin, RN
Jennifer French, NP-C

Our Office Staff

Karen Crum

Office Assistant

Ashli Durham, MA

Registered Medical Assistant

Kristin Gibbs

Office Assistant

Renata Omanovic

Registered Medical Assistant

Barb Sauer

Office Manager

Cathy Stroup

Patient Care Coordinator

Our Doctors By Hospital

Des Peres
Hospital

2345 Dougherty Ferry Rd
St. Louis, MO 63122
314-966-9100

Dr. Juan Garcia

Dr. Lissa Lopez-Concagh

Missouri Baptist
St. Louis

3015 N Ballas Rd
St. Louis, MO 63131
314-996-5000

Dr. Alexis Argoudelis

Dr. Juan Garcia

Dr. Lissa Lopez-Concagh

Missouri Baptist
Sullivan, MO

751 Sappington Bridge Rd
Sullivan, MO 63080
573-468-4186

Dr. Alexis Argoudelis

Dr. Juan Garcia

Dr. Lissa Lopez-Concagh

SSM Health
St. Clare Hospital

1015 Bowles Ave
Fenton, MO 63026
636-496-2000

Dr. Alexis Argoudelis

SSM Health
St. Mary’s Hospital

6420 Clayton Road
St. Louis, MO 63117
314-768-8000

Dr. John Mellas

Emergencies

NHS physicians are available for immediate emergency hospital consultation 24-hours a day, 7 days a week.

Referring Physicians

NHS works closely and collaboratively with referring physicians, communicating throughout the course of treatment.

Dialysis

NHS physicians manage the dialysis treatments of patients at several dialysis centers in the St. Louis and surrounding areas.