Medicare Enrolled
Dr. Gregory Greenwood, M.D.
Internal Medicine · Winston-Salem, NC
Practice pattern: Clinical Cardiology
— Primarily office-based clinical cardiology
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Greenwood from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
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What this data tells you about Dr. Greenwood
Dr. Gregory Greenwood is an internal medicine specialist in Winston-Salem, NC, with 21 years of NPI registration. Based on federal Medicare data, Dr. Greenwood performed 1,555 Medicare services in 2023. These records do not provide a deduplicated patient total.
Between the years covered by Open Payments, Dr. Greenwood received a total of $777,393 from 50 pharmaceutical and/or device companies across 1672 payment records. A record can group multiple payments. These transfers are publicly reported through CMS Open Payments. Disclosure alone does not establish their effect on care. A reliable breakdown by payment category is not available in this snapshot. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Greenwood is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 21 years of NPI registration
▲ Top 23% volume in NC
$777,393 industry payments
Medicare Practice Summary — 2023
Medicare Utilization ↗1,555
Medicare services
Top 23% in NC for internal medicine
Not available
Unique patients (not deduplicated)
$110
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Hospital follow-up visit, moderate complexity Follow-up hospital visit for an existing patient involving moderate medical decision making. The visit requires at least 35 minutes of time spent on the date of service. |
380 | $61 | $125 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
320 | $58 | $183 |
| Hemodialysis, single evaluation A dialysis procedure to filter waste from the blood, performed with a physician's evaluation. |
223 | $55 | $125 |
| Dialysis services for patients 20 or older Dialysis treatment provided to patients aged 20 years or older, involving four or more physician visits per month. |
209 | $274 | $488 |
| Home dialysis services per month Monthly dialysis treatment provided in the patient's home for individuals aged 20 or older. |
130 | $227 | $409 |
| Dialysis procedure with evaluation A dialysis treatment that includes one evaluation. |
99 | $66 | $147 |
| Initial hospital admission, high complexity Initial hospital inpatient or observation care for a new patient involving high-level medical decision making, with at least 75 minutes total time on the date of the encounter. |
95 | $132 | $349 |
| New patient office visit, complex (60-74 min) | 26 | $159 | $352 |
| Removal of tunneled central venous tube This procedure involves the removal of a catheter that has been surgically placed under the skin and threaded into a large vein. |
18 | $127 | $284 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
16 | $39 | $122 |
| Insertion of non-tunneled central venous catheter A procedure to place a central venous catheter for infusion in patients aged 5 years or older. The catheter is inserted directly into a large vein without being tunneled under the skin. |
13 | $65 | $397 |
| Dialysis services for adults, 2-3 visits per month This code covers dialysis services for patients aged 20 or older who have 2 to 3 physician visits per month. |
13 | $228 | $410 |
| Hospital follow-up visit, high complexity Subsequent hospital inpatient or observation care for an existing patient involving high-level medical decision making, with at least 50 minutes total time on the date of the encounter. |
13 | $93 | $179 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. These counts do not measure clinical quality or years of experience.
0.8% high complexity
43.3% medium
55.8% routine
Industry Payment Transparency
Open Payments through 2024 ↗$777,393
Total received (2018-2024)
Avg $111,056/year across 7 years
Top 0% in NC for internal medicine
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
50
Companies
1,672
Payment records
Payments are publicly reported; disclosure does not establish legality · Not evidence of wrongdoing · How to interpret →
Payment categories are unavailable while the source breakdown is being rebuilt. Company and year totals do not identify how much belongs to each category.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$198,895
2023
$166,490
2022
$150,142
2021
$74,240
2020
$65,837
2019
$65,351
2018
$56,439
Payments by company (2024)
Alexion Pharmaceuticals, Inc.
$49,481
Lilly USA, LLC
$42,016
Boehringer Ingelheim Pharmaceuticals, Inc.
$38,988
AstraZeneca Pharmaceuticals LP
$25,240
Travere Therapeutics, Inc.
$14,679
Otsuka America Pharmaceutical, Inc.
$11,009
Bayer Healthcare Pharmaceuticals Inc.
$10,520
AKEBIA THERAPEUTICS INC
$5,753
Amgen Inc.
$212
Novo Nordisk Inc
$174
Mallinckrodt Hospital Products Inc.
$174
Novartis Pharmaceuticals Corporation
$172
ANI Pharmaceuticals, Inc.
$115
Aurinia Pharma U.S., Inc.
$84
Ardelyx, Inc.
$45
Fresenius USA Marketing, Inc.
$35
Vifor Pharma, Inc.
$34
GlaxoSmithKline, LLC.
$34
SHIELD THERAPEUTICS INC
$33
Daiichi Sankyo Inc.
$27
CorMedix Inc.
$24
Outset Medical Inc
$24
Baxter Healthcare
$22
Top 3 companies account for 65.6% of 2024 payments
All-time payments by company (2018-2024) ›
AstraZeneca Pharmaceuticals LP
$275,573
Alexion Pharmaceuticals, Inc.
$238,365
Otsuka America Pharmaceutical, Inc.
$90,512
Boehringer Ingelheim Pharmaceuticals, Inc.
$48,886
Lilly USA, LLC
$42,736
Travere Therapeutics, Inc.
$22,863
Bayer Healthcare Pharmaceuticals Inc.
$20,349
Bayer HealthCare Pharmaceuticals Inc.
$18,286
AKEBIA THERAPEUTICS INC
$6,004
Horizon Therapeutics plc
$4,664
Vifor Pharma, Inc.
$2,085
Amgen Inc.
$1,048
Baxter Healthcare
$884
Mallinckrodt Hospital Products Inc.
$752
Novartis Pharmaceuticals Corporation
$367
GlaxoSmithKline, LLC.
$343
ANI Pharmaceuticals, Inc.
$302
Mallinckrodt Enterprises LLC
$293
Aurinia Pharma U.S., Inc.
$275
OPKO Pharmaceuticals, LLC
$264
Relypsa, Inc.
$247
Novo Nordisk Inc
$236
Daiichi Sankyo Inc.
$226
Mallinckrodt LLC
$188
Fresenius USA Marketing, Inc.
$172
Takeda Pharmaceuticals U.S.A., Inc.
$170
Calliditas Therapeutics US Inc.
$132
ARGENX US, INC.
$126
AstraZeneca UK Limited
$125
Otsuka Pharmaceutical Development & Commercialization, Inc.
$115
Exeltis, USA Inc.
$109
Keryx Biopharmaceuticals, Inc.
$100
Shire North American Group Inc
$79
CALLIDITAS THERAPEUTICS US INC.
$79
Akcea Therapeutics, Inc.
$65
Ardelyx, Inc.
$64
Horizon Pharma plc
$37
SHIELD THERAPEUTICS INC
$33
Bard Peripheral Vascular, Inc.
$29
Veloxis Pharmaceuticals, Inc.
$26
Shield Therapeutics Inc
$25
CorMedix Inc.
$24
Outset Medical Inc
$24
AMAG Pharmaceuticals, Inc.
$22
Rockwell Medical, Inc.
$16
ARBOR PHARMACEUTICALS, INC.
$15
bioMerieux
$15
AngioDynamics, Inc.
$15
Amarin Pharma Inc.
$13
GENZYME CORPORATION
$11
Top 3 companies account for 77.8% of all-time payments
Associated products mentioned in payments ›
ACCRUFER · ACTHAR · AURYXIA · Aranesp · Auryxia · BENLYSTA · DefenCath · ENTRESTO · EVUSHELD · Edarbyclor · Envarsus · FABRAZYME · FARXIGA · FERAHEME · Fabhalta · GATTEX · IBSRELA · INJECTAFER · JARDIANCE · JESDUVROQ · JYNARQUE · KRYSTEXXA · Kerendia · LOKELMA · LUPKYNIS · LUTONIX · Ozempic · PURIFIED CORTROPHIN GEL · Parsabiv · RAYALDEE · Rayaldee · Renal - PD · Renal - Revaclear · Rybelsus · SAMSCA · SOLIRIS · Soliris · TARPEYO · TAVNEOS · TEGSEDI · TRIFERIC · Tavneos · ULTOMIRIS · Uloric · Ultomiris · VYVGART · Vafseo · Vascepa · Velphoro · Veltassa · Wegovy
Should you be concerned? Industry payments are disclosed through CMS Open Payments. Disclosure alone does not establish their purpose, legality, or effect on care. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Geographic Context
Internal medicine physicians in nearby ZIP areas
385
County median income
$65,541
Nearest hospital to ZIP centroid (approximate)
NOVANT HEALTH FORSYTH MEDICAL CENTER
0.0 mi
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | NPPES snapshot; verify current record |
| Medicare Enrollment | ✓ PECOS | PECOS snapshot |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not included | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Greenwood is a clinical cardiology specialist, with above-average Medicare volume (top 23% in NC), with 21 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Greenwood experienced with hospital follow-up visit, moderate complexity?
Based on Medicare claims data, Dr. Greenwood performed 380 hospital follow-up visit, moderate complexity services. These records cover Medicare fee-for-service activity, including eligible younger beneficiaries; they do not measure total practice volume or clinical quality.
Does Dr. Greenwood receive payments from pharmaceutical companies?
Yes. Dr. Greenwood received a total of $777,393 from 50 companies across 1,672 payment records. A record can group multiple payments. These transfers are publicly disclosed through CMS Open Payments. Disclosure alone does not establish their legality or effect on care. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Greenwood's costs compare to other internal medicine physicians in Winston-Salem?
Dr. Greenwood's average Medicare payment per service is $110. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Greenwood) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating the presence of registry, enrollment, activity or payment records, not verified experience or clinical quality. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Source publication dates and the snapshots loaded on this site can differ. Rebuilding a page does not refresh its source records. Check the Medicare reporting year and the payment interval shown above; consult the linked official sources for newer releases and current registry details. See our data freshness policy →
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About this page
This page combines public CMS records with calculated summaries and explanatory procedure labels. These transformations are not verbatim federal records. Sources: NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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