NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1184815656 MD
Verify on CMS → Jeffrey Marcus, MD
Internal Medicine Physician in San Jose, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,858 in Internal Medicine 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
328
Medicare Part D claims · 66 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
41%
generic claims · 59% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
75/100
▼ 8 pts below national avg 83.1 · Above neutral
Industry payments
$173.58
5 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
Jeffrey Marcus, MD reported a CMS MIPS final score of 75/100 - below the 83.1 national average - and filed 328 Medicare Part D claims in 2023.
- 75/100
- MIPS score · -8 vs avg
- 328
- Part D claims, 2023
- 41%
- generic prescribing
- 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.
Jeffrey Marcus, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
75 15th percentile higher than 15% 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 Jeffrey Marcus, MD sits
This provider among internal medicine physician peers
Across the 36,260 internal medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Jeffrey Marcus, MD writes more Part D claims than 35% of them and scores higher on MIPS quality than 14% - 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 internal medicine physician peer from a representative sample of 60; the gold marker is Jeffrey Marcus, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Jeffrey Marcus, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 3 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 Jeffrey Marcus, MD?
Below national averagePrimary specialty
Internal Medicine Physician
Medicare Part D claims
328 88% vs specialty avg
MIPS final score
75/100 8.1 pts vs avg
Specialty distribution in California
How Internal Medicine Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Jeffrey Marcus, MD's 2023 MIPS final score plotted against the Internal Medicine Physician national average
- MIPS Final Score
- 75/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Internal Medicine Physician) - 75/100 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).
Jeffrey Marcus, MD appears in the CMS NPPES registry as a Internal Medicine Physician provider holding MD credentials at 2425 SAMARITAN DR, San Jose, CA, 95124, with a listed phone of (408) 879-5963. NPI 1184815656 was issued on 08/08/2007.
Medicare Part D records for calendar year 2023 show 328 prescription claims written by this provider, covering 66 Medicare beneficiaries and totaling roughly $112K in drug spend, split 59% brand-name and 41% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 75/100 for the 2023 performance year, compared with the national average of 83.1.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,858 enrolled providers across 56 states and an average of 2,716 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 | 1184815656 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 08/08/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
Avg: 83.1
Reporting: Group practice
Hospital and facility affiliations
Facilities where Jeffrey Marcus, MD 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.
According to CMS billing records, Jeffrey Marcus, MD is affiliated with 3 Medicare-billing facilities.
Mojdeh Talebian M D Inc
Redwood City, CA
Msalam M Sara MD Inc
Los Gatos, CA
University Healthcare Alliance
San Jose, CA
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 Jeffrey Marcus, MD. Source: openpaymentsdata.cms.gov.
Total received
$174
Largest payer
Edwards Lifesciences 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.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Jeffrey Marcus, MD. To verify Jeffrey Marcus, MD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Brand-heavy
Jeffrey Marcus, MD - brand share 59.0%
Internal Medicine Physician average
59% brand-name claims vs 41% generic, on 328 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.
328
Total Claims
$112K
Total Drug Cost
66
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 422
- Total Day Supply
- 11,929
- Brand vs Generic
- 59% brand / 41% generic
- Brand Drug Cost
- $106K
- Generic Drug Cost
- $6K
- Antibiotic Claims
- 30
Patient Demographics
- Average Patient Age
- 79.3 years
- Avg HCC Risk Score
- 1.93
- Gender Split
- 62% female / 38% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Jeffrey Marcus, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Trelegy Ellipta
Trelegy Ellipta
47 claims
- Albuterol Sulfate …
Albuterol Sulfate Hfa
35 claims
- Symbicort
Symbicort
30 claims
- Anoro Ellipta
Anoro Ellipta
29 claims
- Breo Ellipta
Breo Ellipta
24 claims
- Montelukast Sodium
Montelukast Sodium
24 claims
- Prednisone 12
Prednisone
12 claims
| Drug | Claims |
|---|---|
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 47 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 35 |
| Symbicort Budesonide/Formoterol Fumarate | 30 |
| Anoro Ellipta Umeclidinium Brm/Vilanterol Tr | 29 |
| Breo Ellipta Fluticasone/Vilanterol | 24 |
| Montelukast Sodium | 24 |
| Prednisone | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Jeffrey Marcus, MD fits within the Internal Medicine Physician landscape nationally.
172,858
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Jeffrey Marcus, MD's 328 claims are below the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Marcus.
Dr. Jacob Aaron
MD
San Francisco, CA
Dr. Alistair Aaronson
MD
Stanford, CA
Dr. Jose Abad.
MD
Sacramento, CA
Dr. Donna Abare
MD
Oakland, CA
Marce Abare
Scotts Valley, CA
Compare Internal Medicine 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 California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Internal Medicine 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 Jeffrey Marcus, MD's specialty? ▼
Jeffrey Marcus, MD specializes in Internal Medicine Physician and practices in San Jose, California. Credentials: MD.
How much does Jeffrey Marcus, MD prescribe under Medicare Part D? ▼
In 2023, Jeffrey Marcus, MD wrote 328 Medicare Part D claims totaling $112K in drug costs for 66 beneficiaries.
What is Jeffrey Marcus, MD's Medicare quality score? ▼
Jeffrey Marcus, MD has a CMS MIPS Final Score of 75/100. The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Jeffrey Marcus, MD located? ▼
Jeffrey Marcus, MD is located at 2425 SAMARITAN DR, San Jose, CA, 95124. Phone: (408) 879-5963.
What is Jeffrey Marcus, MD's NPI number? ▼
Jeffrey Marcus, MD's National Provider Identifier (NPI) is 1184815656, issued on 08/08/2007.
Does Jeffrey Marcus, MD prescribe more brand-name or generic drugs? ▼
Jeffrey Marcus, MD's prescribing is 59% brand-name and 41% generic drugs by claim count, with $106K in brand drug costs.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,858 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Jeffrey Marcus, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Jeffrey Marcus, MD's most frequently prescribed drugs include Trelegy Ellipta, Albuterol Sulfate Hfa, Symbicort. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Jeffrey Marcus, MD accept Medicare? ▼
Jeffrey Marcus, MD appears in CMS Medicare data with 328 Part D claims and 66 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Jeffrey Marcus, MD's credentials? ▼
Jeffrey Marcus, MD's NPI is 1184815656 with credentials MD. 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.