John Gretes, MD
NPI 1043248453 · Nephrology Physician · Gloucester, VA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Gretes, MD is a Nephrology Physician provider in Gloucester, VA (NPI 1043248453).
Provider details
- NPI number
- 1043248453
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 0101025205 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,174 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 391 | $94 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 150 | $341 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 122 | $64 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 101 | $139 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 73 | $114 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'S |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 42 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 340 | 108 |
| Carvedilol | 205 | 63 |
| Losartan Potassium | 172 | 52 |
| Spironolactone | 169 | 52 |
| Furosemide | 161 | 47 |
| Lisinopril | 154 | 36 |
| Metoprolol Succinate | 142 | 43 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$132 across 9 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 739 Thimble Shoals BlvdSte 801Newport News, VA 23606-3585Phone: (757) 873-1009Fax: (757) 873-7689
Registry dates
- Enumerated
- 2006-06-28
- Last updated
- 2021-03-01
- Certified
- 2021-03-01
Frequently asked questions
- What is John Gretes's NPI number?
- John Gretes's National Provider Identifier (NPI) is 1043248453, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Gretes's specialty?
- John Gretes is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is John Gretes located?
- John Gretes's practice location on file with NPPES is 7552 Hospital Dr Ste 302, Gloucester, VA 23061-4178.
- What is John Gretes's phone number?
- The practice phone number listed in the NPPES registry for John Gretes is (804) 693-9062.
- Does John Gretes accept Medicare?
- John Gretes is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Gretes's NPI active?
- Yes — John Gretes's NPI (1043248453) is active in the NPPES registry as of the last update on 2021-03-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.