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Our Team

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

Ballas Location Staff

450 N. Ballas Rd, St. Louis, MO 63131

Jennifer Chaffin, RN
Jill Chambers, MA
Karen Crum, Office Assistant
Katina Smith, MSN, APRN, A-GPCNP-C

Fenton Location Staff

1011 Bowles Avenue, Suite 220, Fenton, MO 63026

Britny Howe, Office Assistant
Emmy Le, DNP, APRN, FNP-BC

Our Doctors By Hospital

Des Peres
Hospital

2345 Dougherty Ferry Rd
St. Louis, MO 63122

Dr. Juan Garcia

Dr. Lissa Lopez-Concagh

Missouri Baptist
St. Louis

450 N. New Ballas Rd
Creve Coeur, MO 63141

Dr. Alexis Argoudelis

Dr. Juan Garcia

Dr. Lissa Lopez-Concagh

Missouri Baptist
Sullivan, MO

751 Sappington Bridge Rd
Sullivan, MO 63080

Dr. Alexis Argoudelis

Dr. Juan Garcia

Dr. Lissa Lopez-Concagh

Dr. Maggie Meier

SSM Health
St. Clare Hospital

1011 Bowles Ave, Suite 220
Fenton, MO 63026

Dr. Alexis Argoudelis

Dr. Maggie Meier

SSM Health
St. Mary’s Hospital

6420 Clayton Road
St. Louis, MO 63117

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.