NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1497859433 MD
Verify on CMS → James Greenberg, MD
Internal Medicine Physician in San Francisco, 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 174,792 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
31K
Medicare Part D claims · 970 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
79%
generic claims · 20% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
81.1/100
▼ 2 pts below national avg 83.5 · Above neutral
Industry payments
$4.4K
183 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
James Greenberg, MD reported a CMS MIPS final score of 81.1/100 - below the 83.5 national average - and filed 31,329 Medicare Part D claims in 2024.
- 81.1/100
- MIPS score · -2 vs avg
- 31K
- Part D claims, 2024
- 79%
- 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.
Federal trust snapshot
What official records show about James Greenberg, MD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1497859433), first enumerated 09/11/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 31,329 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 81.1/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Industry payment transparency
$4.4K in reported industry payments (183 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not James Greenberg, MD's individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
Compare Greenberg with other Internal Medicine Physician providers
Same primary specialty, same federal CMS NPPES roster.
All 1,593 Internal Medicine Physician providers in San Francisco, CA →
Also enrolled in California
- 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
- Dr. Samuel Abarte, M.D. Chula Vista, CA
Other specialties in San Francisco: Student in an Organized Health Care Education/Training Program (3,656) · Marriage & Family Therapist (2,221) · Community Health Worker (1,780) · Counselor (1,732)
CMS NPPES provider registry desk
NPI 1497859433 · Internal Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · MIPS-INLINE · RX-HEAVY · BOOK-MID · PHOTO-FINISH
- NPI-10 1497859433
- ENUM-LEGACY 2006
- TAX-MEGA 175K Internal Medicine
- MIPS-INLINE 81.1/100
- RX-HEAVY 31K claims
- BOOK-MID 20,403 in California
- PHOTO-FINISH Jenna Nash · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Greenberg · this…
Greenberg · this provider
81.1 MIPS pts
- Conor Mulcahy, D…
Conor Mulcahy, D.O.
81.1 MIPS pts
- Jenna Nash · near
Jenna Nash
81.1 MIPS pts
- Jerry Gray, MD ·…
Jerry Gray, MD
81.1 MIPS pts
- Patrick Gray, MD…
Patrick Gray, MD
81.1 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
James Greenberg, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
81 ≥ 32nd percentile 32% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured 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.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where James Greenberg, MD sits
This provider among internal medicine physician peers
Across the 34,612 internal medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, James Greenberg, MD writes more Part D claims than 100% of them and scores higher on MIPS quality than 32% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one internal medicine physician peer from a representative sample of 60; the gold marker is James Greenberg, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
James Greenberg, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 James Greenberg, MD?
Near national averagePrimary specialty
Internal Medicine Physician
Medicare Part D claims
31,329 11× vs specialty avg
MIPS final score
81.1/100 2.4 pts vs avg
Specialty distribution in California
How Internal Medicine Physician compares to other specialties among California providers
Medicare quality performance, MIPS
James Greenberg, MD's 2023 MIPS final score plotted against the Internal Medicine Physician national average
- MIPS Final Score
- 81.1/100
- vs 83.5 national avg · 2023 performance year
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).
Practice Address
Provider Details
| NPI | 1497859433 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/11/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
81.1054
Final Score
Measured-score avg: 83.5
45.907
Quality
85.459
Cost
Reporting: Individual
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 James Greenberg, MD. Source: openpaymentsdata.cms.gov.
Total received
$4.4K
Largest payer
Novo Nordisk 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.
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 James Greenberg, MD. To verify James Greenberg, 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 · Typical
James Greenberg, MD - brand share 20.0%
Internal Medicine Physician average
20% brand-name claims vs 79% generic, on 31,329 2024 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 2024.
31,329
Total Claims
$3.8M
Total Drug Cost
970
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 46,456
- Total Day Supply
- 1,368,023
- Brand vs Generic
- 20% brand / 79% generic
- Brand Drug Cost
- $3.4M
- Generic Drug Cost
- $396K
- Opioid Claims
- 208 (0.7% rate)
- Antibiotic Claims
- 232
Patient Demographics
- Average Patient Age
- 79.1 years
- Avg HCC Risk Score
- 1.27
- Gender Split
- 55% female / 45% male
- Age Distribution
- <65: 31, 65-74: 272, 75-84: 356, 85+: 311
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What James Greenberg, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Amlodipine Besylate
Amlodipine Besylate
1,861 claims
- Atorvastatin Calcium
Atorvastatin Calcium
1,827 claims
- Metformin Hcl
Metformin Hcl
1,160 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
909 claims
- Levothyroxine Sodium
Levothyroxine Sodium
895 claims
- Omeprazole 651
Omeprazole
651 claims
- Dexlansoprazole Dr 643
Dexlansoprazole Dr
643 claims
- Losartan Potassium 635
Losartan Potassium
635 claims
| Drug | Claims |
|---|---|
| Amlodipine Besylate | 1,861 |
| Atorvastatin Calcium | 1,827 |
| Metformin Hcl | 1,160 |
| Rosuvastatin Calcium | 909 |
| Levothyroxine Sodium | 895 |
| Omeprazole | 651 |
| Dexlansoprazole Dr Dexlansoprazole | 643 |
| Losartan Potassium | 635 |
| Eliquis Apixaban | 569 |
| Tamsulosin Hcl | 557 |
* 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 James Greenberg, MD fits within the Internal Medicine Physician landscape nationally.
174,792
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,785
Avg Claims per Provider
James Greenberg, MD's 31,329 claims are above the specialty average of 2,785.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Greenberg, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (81.1 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
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 Greenberg.
One of 20,403 Internal Medicine Physician providers enrolled in California, 11 are shown on this page.
Dr. Alexander Abary
MD
Long Beach, CA
Dr. Luba Abascal
MD
San Francisco, CA
Dr. Michael Abate
MD
Sacramento, CA
Dr. Wali Abawi
D.O.
Joshua Tree, CA
Hazel Abaya
Thousand Oaks, CA
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is James Greenberg, MD's specialty? ▼
James Greenberg, MD specializes in Internal Medicine Physician and practices in San Francisco, California. Credentials: MD.
How much does James Greenberg, MD prescribe under Medicare Part D? ▼
In 2024, James Greenberg, MD wrote 31,329 Medicare Part D claims totaling $3.8M in drug costs for 970 beneficiaries.
What is James Greenberg, MD's Medicare quality score? ▼
James Greenberg, MD has a CMS MIPS Final Score of 81.1/100 (Quality: 45.9, Cost: 85.5). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is James Greenberg, MD located? ▼
James Greenberg, MD is located at 2299 POST ST, San Francisco, CA, 94115. Phone: (415) 474-7955.
What is James Greenberg, MD's NPI number? ▼
James Greenberg, MD's National Provider Identifier (NPI) is 1497859433, issued on 09/11/2006.
Does James Greenberg, MD prescribe more brand-name or generic drugs? ▼
James Greenberg, MD's prescribing is 20% brand-name and 79% generic drugs by claim count, with $3.4M in brand drug costs.
Does James Greenberg, MD prescribe opioids? ▼
Yes, James Greenberg, MD had 208 opioid claims in 2024 with an opioid prescribing rate of 0.7%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 174,792 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,785 Medicare Part D claims per year.
What drugs does James Greenberg, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, James Greenberg, MD's most frequently prescribed drugs include Amlodipine Besylate, Atorvastatin Calcium, Metformin Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does James Greenberg, MD accept Medicare? ▼
James Greenberg, MD appears in CMS Medicare data with 31,329 Part D claims and 970 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify James Greenberg, MD's credentials? ▼
James Greenberg, MD's NPI is 1497859433 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 (2024). 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 August 2026 (NPPES) / 2024 (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
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.