NPI registry status
Active
2026 NPPES data Emergency Medicine Physician NPI 1861842809 MD
Verify on CMS → Karen Weinbaum, MD
Emergency 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 64,463 in Emergency 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
2K
Medicare Part D claims · 93 beneficiaries · Emergency Medicine Physician avg: 352
Generic prescribing
70%
generic claims · 27% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Karen Weinbaum, MD filed 2,421 Medicare Part D claims in 2023 as an Emergency Medicine Physician in San Francisco, California, prescribing 70% generic.
- 2K
- Part D claims, 2023
- 70%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥86th
- pct by Part D claim volume (lower-bound band)
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 Karen Weinbaum, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1861842809), first enumerated 06/21/2016.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 2,421 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- 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
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Karen Weinbaum, 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.
CMS NPPES provider registry desk
NPI 1861842809 · Emergency Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · RX-MID · BOOK-MID · PHOTO-ENUM
- NPI-10 1861842809
- ENUM-MID 2016
- TAX-MEGA 64K Emergency Medicine
- RX-MID 2,421
- BOOK-MID 6,965 in California
- PHOTO-ENUM James Neitzel · 2016
Karen Weinbaum, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
2,421 ≥ 86th percentile 86% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Karen Weinbaum, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - 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 Karen Weinbaum, MD?
Quality data not reportedPrimary specialty
Emergency Medicine Physician
Medicare Part D claims
2,421 7× vs specialty avg
Specialty distribution in California
How Emergency Medicine Physician compares to other specialties among California 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 Emergency Medicine 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).
Practice Address
Provider Details
| NPI | 1861842809 |
|---|---|
| Specialty | Emergency Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 06/21/2016 |
Hospital and facility affiliations
Facilities where Karen Weinbaum, 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.
City And County OF San Francisco
San Francisco, 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).
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 Karen Weinbaum, MD. To verify Karen Weinbaum, 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 · Above average
Karen Weinbaum, MD - brand share 27.0%
Emergency Medicine Physician average
27% brand-name claims vs 70% generic, on 2,421 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.
2,421
Total Claims
$1.6M
Total Drug Cost
93
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,198
- Total Day Supply
- 93,284
- Brand vs Generic
- 27% brand / 70% generic
- Brand Drug Cost
- $1.5M
- Generic Drug Cost
- $80K
- Opioid Claims
- 47 (1.9% rate)
- Antibiotic Claims
- 19
Patient Demographics
- Average Patient Age
- 67.0 years
- Avg HCC Risk Score
- 1.38
- Gender Split
- 31% female / 69% male
- Age Distribution
- <65: 24, 65-74: 55, 75-84: 14, 85+: 0
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Karen Weinbaum, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
198 claims
- Amlodipine Besylate
Amlodipine Besylate
110 claims
- Tivicay
Tivicay
93 claims
- Descovy
Descovy
81 claims
- Lisinopril 74
Lisinopril
74 claims
- Biktarvy 67
Biktarvy
67 claims
- Acyclovir 64
Acyclovir
64 claims
- Finasteride 59
Finasteride
59 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 198 |
| Amlodipine Besylate | 110 |
| Tivicay Dolutegravir Sodium | 93 |
| Descovy Emtricitabine/Tenofov Alafenam | 81 |
| Lisinopril | 74 |
| Biktarvy Bictegrav/Emtricit/Tenofov Ala | 67 |
| Acyclovir | 64 |
| Finasteride | 59 |
| Tamsulosin Hcl | 57 |
| Isentress Raltegravir Potassium | 47 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Emergency Medicine Physician Overview
How Karen Weinbaum, MD fits within the Emergency Medicine Physician landscape nationally.
64,463
Emergency Medicine Physician Providers in US
56
States with Emergency Medicine Physician
352
Avg Claims per Provider
Karen Weinbaum, MD's 2,421 claims are above the specialty average of 352.
Nationwide Emergency Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Weinbaum, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2016)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Emergency Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Weinbaum.
One of 6,965 Emergency Medicine Physician providers enrolled in California, 5 are shown here.
Dr. Cooper Aakhus
MD
Stanford, CA
Dr. Pyra Aarden
MD
Martinez, CA
Dr. Neal Aaron
D.O.
Encinitas, CA
Eric Aaserude
Walnut Creek, CA
Dr. Nader Abas
MD
Barstow, CA
Compare Emergency Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Karen Weinbaum, MD's specialty? ▼
Karen Weinbaum, MD specializes in Emergency Medicine Physician and practices in San Francisco, California. Credentials: MD.
How much does Karen Weinbaum, MD prescribe under Medicare Part D? ▼
In 2023, Karen Weinbaum, MD wrote 2,421 Medicare Part D claims totaling $1.6M in drug costs for 93 beneficiaries.
Where is Karen Weinbaum, MD located? ▼
Karen Weinbaum, MD is located at 1171 MISSION ST, San Francisco, CA, 94103. Phone: (628) 754-9616.
What is Karen Weinbaum, MD's NPI number? ▼
Karen Weinbaum, MD's National Provider Identifier (NPI) is 1861842809, issued on 06/21/2016.
Does Karen Weinbaum, MD prescribe more brand-name or generic drugs? ▼
Karen Weinbaum, MD's prescribing is 27% brand-name and 70% generic drugs by claim count, with $1.5M in brand drug costs.
Does Karen Weinbaum, MD prescribe opioids? ▼
Yes, Karen Weinbaum, MD had 47 opioid claims in 2023 with an opioid prescribing rate of 1.9%.
How many Emergency Medicine Physician providers are there in the US? ▼
There are 64,463 Emergency Medicine Physician providers across 56 states in the US. The average Emergency Medicine Physician provider writes 352 Medicare Part D claims per year.
What drugs does Karen Weinbaum, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Karen Weinbaum, MD's most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Tivicay. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Karen Weinbaum, MD accept Medicare? ▼
Karen Weinbaum, MD appears in CMS Medicare data with 2,421 Part D claims and 93 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Karen Weinbaum, MD's credentials? ▼
Karen Weinbaum, MD's NPI is 1861842809 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.
- 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
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 May 2026.