NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1558364604 M.D.
Verify on CMS → Marc Weinberg, M.D.
Nephrology Physician in Providence, Rhode Island.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,534 in Nephrology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
1K
Medicare Part D claims · 61 beneficiaries · Nephrology Physician avg: 1K
Generic prescribing
79%
generic claims · 20% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$106.32
6 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Marc Weinberg, M.D. filed 1,383 Medicare Part D claims in 2023 as a Nephrology Physician in Providence, Rhode Island, prescribing 79% generic.
- 1K
- Part D claims, 2023
- 79%
- generic prescribing
- $106.32
- industry payments (Sunshine Act)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Marc Weinberg, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,383 Top 21% higher than 79% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Marc Weinberg, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Marc Weinberg, M.D.?
Quality data not reportedPrimary specialty
Nephrology Physician
Medicare Part D claims
1,383 5% vs specialty avg
Specialty distribution in Rhode Island
How Nephrology Physician compares to other specialties among Rhode Island providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Nephrology Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Marc Weinberg, M.D. appears in the CMS NPPES registry as a Nephrology Physician provider holding M.D. credentials at 1 RANDALL SQ STE 304, Providence, RI, 02904, with a listed phone of (401) 228-3000. NPI 1558364604 was issued on 05/23/2005.
Medicare Part D records for calendar year 2023 show 1,383 prescription claims written by this provider, covering 61 Medicare beneficiaries and totaling roughly $308K in drug spend, split 20% brand-name and 79% generic by claim count, with an opioid prescribing rate of 2.4%.
Nephrology Physician is a mid-sized specialty nationwide, with 10,534 enrolled providers across 55 states and an average of 1,454 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1558364604 |
|---|---|
| Specialty | Nephrology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/23/2005 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Marc Weinberg, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$106
Largest payer
Novartis Pharmaceuticals Corporation
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Typical
Marc Weinberg, M.D. - brand share 20.0%
Nephrology Physician average
20% brand-name claims vs 79% generic, on 1,383 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
1,383
Total Claims
$308K
Total Drug Cost
61
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,602
- Total Day Supply
- 75,895
- Brand vs Generic
- 20% brand / 79% generic
- Brand Drug Cost
- $263K
- Generic Drug Cost
- $45K
- Opioid Claims
- 33 (2.4% rate)
- Antibiotic Claims
- 41
Patient Demographics
- Average Patient Age
- 75.3 years
- Avg HCC Risk Score
- 1.11
- Gender Split
- 43% female / 57% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Marc Weinberg, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Rosuvastatin Calcium
Rosuvastatin Calcium
119 claims
- Amlodipine Besylate
Amlodipine Besylate
69 claims
- Ozempic
Ozempic
62 claims
- Candesartan Cilexe…
Candesartan Cilexetil
54 claims
- Omeprazole
Omeprazole
54 claims
- Escitalopram Oxalate 44
Escitalopram Oxalate
44 claims
- Levothyroxine Sodium 44
Levothyroxine Sodium
44 claims
- Omega-3 Acid Ethyl… 35
Omega-3 Acid Ethyl Esters
35 claims
| Drug | Claims |
|---|---|
| Rosuvastatin Calcium | 119 |
| Amlodipine Besylate | 69 |
| Ozempic Semaglutide | 62 |
| Candesartan Cilexetil | 54 |
| Omeprazole | 54 |
| Escitalopram Oxalate | 44 |
| Levothyroxine Sodium | 44 |
| Omega-3 Acid Ethyl Esters | 35 |
| Lorazepam | 33 |
| Eliquis Apixaban | 31 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nephrology Physician Overview
How Marc Weinberg, M.D. fits within the Nephrology Physician landscape nationally.
10,534
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,454
Avg Claims per Provider
Marc Weinberg, M.D.'s 1,383 claims are below the specialty average of 1,454.
Nearby Nephrology Physician Providers in Rhode Island
Other clinicians with the same primary specialty enrolled in Rhode Island, drawn from the same CMS NPPES roster as Weinberg.
Dr. J Gary Abuelo
MD
Riverside, RI
Dr. Rasha Alawieh
MD
Providence, RI
Dr. Maroun Azar
M.D.
Warwick, RI
Dr. Keith Bartolomei
M.D.
Providence, RI
Dr. George Bayliss
M.D.
Riverside, RI
Compare Nephrology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Rhode Island medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Nephrology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Rhode Island
Frequently Asked Questions
What is Marc Weinberg, M.D.'s specialty? ▼
Marc Weinberg, M.D. specializes in Nephrology Physician and practices in Providence, Rhode Island. Credentials: M.D..
How much does Marc Weinberg, M.D. prescribe under Medicare Part D? ▼
In 2023, Marc Weinberg, M.D. wrote 1,383 Medicare Part D claims totaling $308K in drug costs for 61 beneficiaries.
Where is Marc Weinberg, M.D. located? ▼
Marc Weinberg, M.D. is located at 1 RANDALL SQ STE 304, Providence, RI, 02904. Phone: (401) 228-3000.
What is Marc Weinberg, M.D.'s NPI number? ▼
Marc Weinberg, M.D.'s National Provider Identifier (NPI) is 1558364604, issued on 05/23/2005.
Does Marc Weinberg, M.D. prescribe more brand-name or generic drugs? ▼
Marc Weinberg, M.D.'s prescribing is 20% brand-name and 79% generic drugs by claim count, with $263K in brand drug costs.
Does Marc Weinberg, M.D. prescribe opioids? ▼
Yes, Marc Weinberg, M.D. had 33 opioid claims in 2023 with an opioid prescribing rate of 2.4%.
How many Nephrology Physician providers are there in the US? ▼
There are 10,534 Nephrology Physician providers across 55 states in the US. The average Nephrology Physician provider writes 1,454 Medicare Part D claims per year.
What drugs does Marc Weinberg, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Marc Weinberg, M.D.'s most frequently prescribed drugs include Rosuvastatin Calcium, Amlodipine Besylate, Ozempic. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Marc Weinberg, M.D. accept Medicare? ▼
Marc Weinberg, M.D. appears in CMS Medicare data with 1,383 Part D claims and 61 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Marc Weinberg, M.D.'s credentials? ▼
Marc Weinberg, M.D.'s NPI is 1558364604 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.