NPI registry status
Active
2026 NPPES data Emergency Medicine Physician NPI 1740458652 MD
Verify on CMS → Rebecca Walker, MD
Emergency Medicine Physician in Stanford, 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
40
Medicare Part D claims · 33 beneficiaries · Emergency Medicine Physician avg: 352
MIPS score
76.5/100
▼ 7 pts below national avg 83.5 · Above neutral
Industry payments
$131.8
2 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Rebecca Walker, MD reported a CMS MIPS final score of 76.5/100 - below the 83.5 national average - and filed 40 Medicare Part D claims in 2023.
- 76.5/100
- MIPS score · -7 vs avg
- 40
- Part D claims, 2023
- Likely
- board-certified (heuristic)
- ≥17th
- pct among measured MIPS (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.
CMS NPPES provider registry desk
NPI 1740458652 · Emergency Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · MIPS-BELOW · RX-TRACE · BOOK-MID · PHOTO-FINISH
- NPI-10 1740458652
- ENUM-MID 2008
- TAX-MEGA 64K Emergency Medicine
- MIPS-BELOW 76.5/100
- RX-TRACE 40
- BOOK-MID 6,965 in California
- PHOTO-FINISH Michael Cunningham · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Walker · this pr…
Walker · this provider
76.5 MIPS pts
- Steven Elliott ·…
Steven Elliott
76.5 MIPS pts
- Brett Cohen · near
Brett Cohen
76.5 MIPS pts
- Ashley Puls · near
Ashley Puls
76.5 MIPS pts
- Michael Cunningh…
Michael Cunningham
76.5 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Rebecca Walker, 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.
77 ≥ 17th percentile 17% 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 Rebecca Walker, MD sits
This provider among emergency medicine physician peers
Across the 14,017 emergency medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Rebecca Walker, MD writes more Part D claims than 13% of them and scores higher on MIPS quality than 12% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one emergency medicine physician peer from a representative sample of 60; the gold marker is Rebecca Walker, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Rebecca Walker, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Rebecca Walker, MD?
Below national averagePrimary specialty
Emergency Medicine Physician
Medicare Part D claims
40 89% vs specialty avg
MIPS final score
76.5/100 7 pts vs avg
Specialty distribution in California
How Emergency Medicine Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Rebecca Walker, MD's 2023 MIPS final score plotted against the Emergency Medicine Physician national average
- MIPS Final Score
- 76.5/100
- 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 | 1740458652 |
|---|---|
| Specialty | Emergency Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 02/13/2008 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
76.5025
Final Score
Measured-score avg: 83.5
74.3195
Quality
43.9595
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Rebecca Walker, 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.
Stanford Health Care
★★★★★ 5/5
Stanford, CA
Acute Care Hospitals
CMS CCN: 050441
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 Rebecca Walker, MD. Source: openpaymentsdata.cms.gov.
Total received
$132
Largest payer
Abbott Laboratories
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 Rebecca Walker, MD. To verify Rebecca Walker, 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
40
Total Claims
$493
Total Drug Cost
33
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 40
- Total Day Supply
- 280
- Generic Drug Cost
- $414
- Antibiotic Claims
- 28
Patient Demographics
- Average Patient Age
- 71.8 years
- Avg HCC Risk Score
- 1.96
- Gender Split
- 55% female / 45% male
Emergency Medicine Physician Overview
How Rebecca Walker, 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
Rebecca Walker, MD's 40 claims are below the specialty average of 352.
Nationwide Emergency Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Walker, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (76.5 here).
Same NPPES enumeration year (2008)
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 Walker.
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 Rebecca Walker, MD's specialty? ▼
Rebecca Walker, MD specializes in Emergency Medicine Physician and practices in Stanford, California. Credentials: MD.
How much does Rebecca Walker, MD prescribe under Medicare Part D? ▼
In 2023, Rebecca Walker, MD wrote 40 Medicare Part D claims totaling $493 in drug costs for 33 beneficiaries.
What is Rebecca Walker, MD's Medicare quality score? ▼
Rebecca Walker, MD has a CMS MIPS Final Score of 76.5/100 (Quality: 74.3, Cost: 44). 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 Rebecca Walker, MD located? ▼
Rebecca Walker, MD is located at 300 PASTEUR DR, Stanford, CA, 94305. Phone: (650) 723-4000.
What is Rebecca Walker, MD's NPI number? ▼
Rebecca Walker, MD's National Provider Identifier (NPI) is 1740458652, issued on 02/13/2008.
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.
Does Rebecca Walker, MD accept Medicare? ▼
Rebecca Walker, MD appears in CMS Medicare data with 40 Part D claims and 33 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Rebecca Walker, MD's credentials? ▼
Rebecca Walker, MD's NPI is 1740458652 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
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.