JOHN CONSTANTINE GRETES (MD) – Nephrology Physician, NPI 1043248453
Nephrology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
332 NEPHROLOGY in VA
Provider Addresses for JOHN CONSTANTINE GRETES (MD)
739 Thimble Shoals Blvd
Ste 801
Newport News, VA 236063585
Phone: (757) 873-1009
Fax: (757) 873-7689
Type: Location
739, Thimble Shoals Boulevard, City Center, Newport News, Newport News City, Virginia, 23606, United States
STE 801
NEWPORT NEWS, VA 236063585
Phone: (757) 873-1009
Fax: (757) 873-7689
Type: Location
856, J Clyde Morris Boulevard, City Center, Newport News, Newport News City, Virginia, 23601, United States
STE A
NEWPORT NEWS, VA 236011318
Phone:
Type: Mailing
7552 HOSPITAL DR STE 302
GLOUCESTER, VA 230614178
Phone: (804) 693-9062
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 18 Open Payments records for all available years, with a total value of $287.
Total Amount is formed as General ($287) + Research ($0) + Ownership ($0) = $287.
Last reported payment date: 2024-12-02 • Largest payer in this snapshot: Mallinckrodt Hospital Products Inc. ($88).
Total Amount
$287
General + Research + Ownership
Payments
18
Total payment records
General Amount
$287
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-02
Latest reported date
Top Companies
Largest payers in this snapshot
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2008-10-03
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20081003000045 | I | Nephrology | VA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 396 | 212 | $0 |
| 90960 | Dialysis services, 4 or more physician visits per month (20 years or older) | 137 | 42 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 101 | 90 | $0 |
| 90961 | Dialysis services, 2-3 physician visits per month (20 years or older) | 70 | 39 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 60 | 39 | $0 |
Insurance plans in this area (ZIP 23606)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| NEPHROLOGY | VA | 90961 | Dialysis services (2-3 physician visits per month), patient 20 years of age and older | 97 | 50 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| - | VA | |
| - | VA | |
| Family Practice | VA | |
| - | VA | |
| H O S P I T A L I S T | WV | |
| - | PA | |
| G A S T R O E N T E R O L O G Y | VA | |
| General Surgery | VA | |
| Internal Medicine | VA | |
| Internal Medicine | VA |
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