Gregory Greenwood, M.D.
NPI 1316946858 · Nephrology Physician · Winston-Salem, NC
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Greenwood, M.D. is a Nephrology Physician provider in Winston-Salem, NC (NPI 1316946858).
Provider details
- NPI number
- 1316946858
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 85296 (NC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,653 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 | 333 | $88 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 315 | $74 |
| Hemodialysis Procedure With Physician Evaluation90935 | 238 | $66 |
| 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'SG2211 | 234 | $15 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 190 | $331 |
| Home Dialysis Services Per Month (20 Years Or Older) |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 76 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Furosemide | 339 | 78 |
| Empagliflozinbrand: Jardiance | 240 | 47 |
| Dapagliflozin Propanediolbrand: Farxiga | 239 | 57 |
| Amlodipine Besylate | 156 | 45 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 151 | 22 |
| Losartan Potassium | 149 | 43 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$198,895 across 372 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
Registry dates
- Enumerated
- 2005-07-18
- Last updated
- 2021-08-30
- Certified
- 2021-08-30
Frequently asked questions
- What is Gregory Greenwood's NPI number?
- Gregory Greenwood's National Provider Identifier (NPI) is 1316946858, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Greenwood's specialty?
- Gregory Greenwood is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Greenwood located?
- Gregory Greenwood's practice location on file with NPPES is 730 Highland Oaks Dr, Winston-Salem, NC 27103-7108.
- What is Gregory Greenwood's phone number?
- The practice phone number listed in the NPPES registry for Gregory Greenwood is (336) 768-2425.
- Does Gregory Greenwood accept Medicare?
- Gregory Greenwood is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Greenwood's NPI active?
- Yes — Gregory Greenwood's NPI (1316946858) is active in the NPPES registry as of the last update on 2021-08-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.