Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

John Constantine Gretes, MD

Individual provider Nephrology Physician · NPI 1043248453

John Constantine Gretes, MD is a Nephrology in Gloucester, Virginia. Graduated from Duke University School of Medicine in 1972, 54 years ago. Practices with Riverside Physician Services Inc, a 793-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Virginia.

Years since qualifying
54
Trained at
Duke University School of Medicine
Licensed in
VA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

7552 Hospital Dr Ste 302
Gloucester, VA 23061-4178
Phone: (804) 693-9062
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 739 Thimble Shoals Blvd, Newport News, VA 23606-3585 — (757) 873-1009

Specialties & licences

Nephrology Physician (primary) Taxonomy 207RN0300X · Licence 0101025205 (VA)

Record details

NPI number1043248453
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 28, 2006
Last updated in NPPESMarch 1, 2021
Certification dateMarch 1, 2021
Mailing address856 J Clyde Morris Blvd, Ste A, Newport News, VA 23601-1318

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNEPHROLOGY
Medical schoolDUKE UNIVERSITY SCHOOL OF MEDICINE
Graduated 1972 (54 years in practice)
Group practice Riverside Physician Services Inc — 793 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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