NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1588807408
Verify on CMS → Keiko Greenberg
Nephrology Physician in Baltimore, Maryland.
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
517
Medicare Part D claims · 76 beneficiaries · Nephrology Physician avg: 1K
MIPS score
76.6/100
▼ 7 pts below national avg 83.1 · Above neutral
Industry payments
$89.46
1 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Keiko Greenberg reported a CMS MIPS final score of 76.6/100 - below the 83.1 national average - and filed 517 Medicare Part D claims in 2023.
- 76.6/100
- MIPS score · -7 vs avg
- 517
- Part D claims, 2023
- Likely
- board-certified (heuristic)
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.
Keiko Greenberg's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
77 21st percentile higher than 21% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Keiko Greenberg sits
This provider among nephrology physician peers
Across the 2,476 nephrology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Keiko Greenberg writes more Part D claims than 26% of them and scores higher on MIPS quality than 37% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one nephrology physician peer from a representative sample of 60; the gold marker is Keiko Greenberg. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Keiko Greenberg practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 2 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Keiko Greenberg?
Below national averagePrimary specialty
Nephrology Physician
Medicare Part D claims
517 64% vs specialty avg
MIPS final score
76.6/100 6.5 pts vs avg
Specialty distribution in Maryland
How Nephrology Physician compares to other specialties among Maryland providers
Medicare quality performance, MIPS
Keiko Greenberg's 2023 MIPS final score plotted against the Nephrology Physician national average
- MIPS Final Score
- 76.6/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Nephrology Physician) - 76.6/100 vs national avg 83.1
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).
Keiko Greenberg appears in the CMS NPPES registry as a Nephrology Physician provider at 1830 E MONUMENT ST STE 416, Baltimore, MD, 21287, with a listed phone of (410) 955-5268. NPI 1588807408 was issued on 04/07/2009.
Medicare Part D records for calendar year 2023 show 517 prescription claims written by this provider, covering 76 Medicare beneficiaries and totaling roughly $123K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 76.6/100 for the 2023 performance year (Quality 63.2, Cost 55.9), compared with the national average of 83.1.
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 | 1588807408 |
|---|---|
| Specialty | Nephrology Physician |
| Gender | Female |
| NPI Issued | 04/07/2009 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
76.555
Final Score
Avg: 83.1
63.1616
Quality
55.9413
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Keiko Greenberg bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Medstar Medical Group II LLC
Washington, DC
Mgmc LLC
Washington, DC
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Keiko Greenberg. Source: openpaymentsdata.cms.gov.
Total received
$89
Largest payer
Travere Therapeutics, Inc.
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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
517
Total Claims
$123K
Total Drug Cost
76
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,161
- Total Day Supply
- 34,299
- Generic Drug Cost
- $18K
Patient Demographics
- Average Patient Age
- 64.1 years
- Avg HCC Risk Score
- 4.45
- Gender Split
- 30% female / 70% male
- Age Distribution
- <65: 29, 65-74: 33, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Keiko Greenberg prescribes most
Top Medicare Part D drugs by claim count, 2023
- Carvedilol
Carvedilol
36 claims
- Amlodipine Besylate
Amlodipine Besylate
23 claims
- Nifedipine Er
Nifedipine Er
22 claims
- Lisinopril
Lisinopril
20 claims
- Atorvastatin Calcium
Atorvastatin Calcium
19 claims
- Sevelamer Carbonate
Sevelamer Carbonate
17 claims
- Furosemide
Furosemide
15 claims
- Losartan Potassium 13
Losartan Potassium
13 claims
| Drug | Claims |
|---|---|
| Carvedilol | 36 |
| Amlodipine Besylate | 23 |
| Nifedipine Er Nifedipine | 22 |
| Lisinopril | 20 |
| Atorvastatin Calcium | 19 |
| Sevelamer Carbonate | 17 |
| Furosemide | 15 |
| Losartan Potassium | 13 |
| Hydralazine Hcl | 12 |
| Jardiance Empagliflozin | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nephrology Physician Overview
How Keiko Greenberg 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
Keiko Greenberg's 517 claims are below the specialty average of 1,454.
Nearby Nephrology Physician Providers in Maryland
Other clinicians with the same primary specialty enrolled in Maryland, drawn from the same CMS NPPES roster as Greenberg.
Dr. Hossam Abdalla
M.D.
Glen Burnie, MD
Dr. Marwa Abdalla
MBBS
Waldorf, MD
Dr. Veena Acharya
MD
Bel Air, MD
Dr. Rohini Adhikarla
M.D
Lutherville Timonium, MD
Dr. Muzna Adil
M.D.
Suitland, MD
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 Maryland 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
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Medical Specialties Explained
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Understanding Medicare Claims Data
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How insurance networks affect your costs
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Frequently Asked Questions
What is Keiko Greenberg's specialty? ▼
Keiko Greenberg specializes in Nephrology Physician and practices in Baltimore, Maryland.
How much does Keiko Greenberg prescribe under Medicare Part D? ▼
In 2023, Keiko Greenberg wrote 517 Medicare Part D claims totaling $123K in drug costs for 76 beneficiaries.
What is Keiko Greenberg's Medicare quality score? ▼
Keiko Greenberg has a CMS MIPS Final Score of 76.6/100 (Quality: 63.2, Cost: 55.9). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Keiko Greenberg located? ▼
Keiko Greenberg is located at 1830 E MONUMENT ST STE 416, Baltimore, MD, 21287. Phone: (410) 955-5268.
What is Keiko Greenberg's NPI number? ▼
Keiko Greenberg's National Provider Identifier (NPI) is 1588807408, issued on 04/07/2009.
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 Keiko Greenberg prescribe most often? ▼
Based on 2023 Medicare Part D data, Keiko Greenberg's most frequently prescribed drugs include Carvedilol, Amlodipine Besylate, Nifedipine Er. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Keiko Greenberg accept Medicare? ▼
Keiko Greenberg appears in CMS Medicare data with 517 Part D claims and 76 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Keiko Greenberg's credentials? ▼
Keiko Greenberg's NPI is 1588807408. 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.