JOHN CONSTANTINE GRETES MD
NPI 1043248453
Internal Medicine - Nephrology in Gloucester, VA

Active since June 28, 2006PECOS EnrolledAccepts Medicare Assignment
94.07/100
CMS Quality Rating
7552 HOSPITAL DR STE 302, GLOUCESTER, VA 23061(804) 693-9062 Get Directions Write a Review

NPPES record last updated: March 1, 2021. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About John Constantine Gretes Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN CONSTANTINE GRETES MD (NPI 1043248453) is an individual nephrology provider in Gloucester, Virginia, licensed in Virginia (0101025205) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Riverside Regional Medical Center, and maintains a secondary practice location in Newport News.

NPPES Registry Identity

NPI1043248453
Entity TypeIndividualMale
Primary Taxonomy207RN0300X
Provider Legal NameJOHN CONSTANTINE GRETESCredential: MD
Location Address7552 HOSPITAL DR STE 302Gloucester, VA 23061-4178
Mailing Address856 J Clyde Morris Blvd, Ste ANewport News, VA 23601-1318
Sole ProprietorNo
Medical School CMSDuke University School Of MedicineGraduated 1972
Enumeration DateJune 28, 2006
Last NPPES UpdateMarch 1, 2021
NPPES CertifiedMarch 1, 2021
NPI 1043248453 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
License Licensed in VA · 0101025205
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
7552 HOSPITAL DR STE 302, Gloucester, VA 23061

Secondary Practice Location 1

Location 1739 Thimble Shoals Blvd, Ste 801Newport News, VA 23606-3585 · Phone (757) 873-1009 · Fax (757) 873-7689

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

Enrolled in Medicare and accepts Medicare assignment

John Constantine Gretes Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5991722084
PECOS Enrollment IDI20081003000045
Eligible to Order & Refer Part B Labs & Imaging Durable Medical Equipment Home Health Agency Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 13

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
391 services244 patients
Dialysis services, 4 or more physician visits per month (20 years or older) 90960
Dialysis is a treatment that filters and purifies your blood using a machine. It helps keep your fluids and electrolytes in balance when the kidneys can't do their job. This service includes 4 or more visits per month with a physician to monitor your health and adjust your treatment as needed.
150 services39 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
122 services105 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
101 services72 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
73 services41 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
45 services45 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Riverside Regional Medical Center

Acute Care Hospitals · Newport News, VA
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number490052
Location500 J Clyde Morris BlvdNewport News, VA 23601 · Newport News City County
Emergency services Birthing friendly

Riverside Walter Reed Hospital

Acute Care Hospitals · Gloucester, VA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number490130
Location7519 Hospital RoadGloucester, VA 23061 · Gloucester County
Emergency services

Riverside Doctors' Hospital Of Williamsburg

Acute Care Hospitals · Williamsburg, VA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number490143
Location1500 Commonwealth AvenueWilliamsburg, VA 23185 · James City County
Emergency services

Rappahannock General Hospital

Critical Access Hospitals · Kilmarnock, VA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number491308
Location101 Harris RoadKilmarnock, VA 22482 · Lancaster County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 23061 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$129.04 typical visit price
range $56.19 – $170.30
Typical copayment $32.26 (range $14.04 – $42.57)
Most-billed visit code 99204
Established Patient
$99.13 typical visit price
range $18.07 – $138.91
Typical copayment $24.78 (range $4.51 – $34.72)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

94.07/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality90.65
Promoting Interoperability95.83
Improvement Activities40

Referred Medical Equipment & Supplies CMS DME claims 4

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Tacrolimus, immediate release, oral, 1 mg J7507
Treatment-Treatment - Miscellaneous · category RX029N
3 suppliers13 claims2,895 services$0.29 avg. paid by Medicare
Cyclosporine, oral, 25 mg J7515
Treatment-Treatment - Miscellaneous · category RX029N
1 supplier13 claims1,170 services$0.54 avg. paid by Medicare
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for the first prescription in a 30-day period Q0511
Treatment-Chemotherapy · category RH012N
4 suppliers20 claims20 services$16.37 avg. paid by Medicare
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for a subsequent prescription in a 30-day period Q0512
Treatment-Chemotherapy · category RH012N
2 suppliers15 claims15 services$12.59 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Otolaryngology
7552 HOSPITAL DR STE 302
GLOUCESTER, VA 23061
Registered Nurse
7552 HOSPITAL DR STE 302
GLOUCESTER, VA 23061
Urology
7552 HOSPITAL DR STE 302
GLOUCESTER, VA 23061
Internal Medicine (Nephrology)
7552 HOSPITAL DR STE 302
GLOUCESTER, VA 23061
Nurse Practitioner (Gerontology)
7552 HOSPITAL DR STE 302
GLOUCESTER, VA 23061

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Gretes's NPI number?

The NPI number for John Gretes is 1043248453. It was assigned to this individual provider in the NPPES registry on June 28, 2006.

Where is John Gretes located?

John Gretes practices at 7552 Hospital Dr Ste 302, Gloucester, VA 23061. The listed phone number is (804) 693-9062.

What is John Gretes's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is John Gretes enrolled in Medicare?

Yes. John Gretes is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Is John Gretes affiliated with any hospitals?

According to CMS data, John Gretes is affiliated with Riverside Regional Medical Center, Riverside Walter Reed Hospital, Riverside Doctors' Hospital Of Williamsburg and Rappahannock General Hospital.

When was this NPI record last updated?

The NPPES record for John Gretes was last updated on March 1, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.