NPI registry status
Active
2026 NPPES data Emergency Medicine Physician NPI 1518012954
Verify on CMS → David Williams
Emergency Medicine Physician in Los Angeles, 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
271
Medicare Part D claims · 162 beneficiaries · Emergency Medicine Physician avg: 352
MIPS score
94.6/100
▲ 11 pts above national avg 83.5 · Exceptional
What the federal data shows
David Williams reported a CMS MIPS final score of 94.6/100 - above the 83.5 national average - and filed 271 Medicare Part D claims in 2023.
- 94.6/100
- MIPS score · +11 vs avg
- 271
- Part D claims, 2023
- Likely
- board-certified (heuristic)
- ≥73rd
- 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.
Federal trust snapshot
What official records show about David Williams
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 1518012954), first enumerated 01/24/2007.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 271 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 94.6/100 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
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 David Williams'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 1518012954 · Emergency Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · MIPS-ELITE · RX-LIGHT · BOOK-MID · PHOTO-FINISH
- NPI-10 1518012954
- ENUM-MID 2007
- TAX-MEGA 64K Emergency Medicine
- MIPS-ELITE 94.6/100
- RX-LIGHT 271
- BOOK-MID 6,965 in California
- PHOTO-FINISH Sumit Arora · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Williams · this …
Williams · this provider
94.6 MIPS pts
- Oscar Bravo · hi…
Oscar Bravo
94.6 MIPS pts
- Sumit Arora · near
Sumit Arora
94.6 MIPS pts
- Mark Baldeshwile…
Mark Baldeshwiler
94.6 MIPS pts
- Andrew Bellino ·…
Andrew Bellino
94.6 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
David Williams'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.
95 ≥ 73rd percentile 73% 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 David Williams 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, David Williams writes more Part D claims than 76% of them and scores higher on MIPS quality than 67% - placing this provider in the high-volume, high-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 David Williams. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
David Williams 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 David Williams?
High performer (top quartile)Primary specialty
Emergency Medicine Physician
Medicare Part D claims
271 23% vs specialty avg
MIPS final score
94.6/100 11.1 pts vs avg
Specialty distribution in California
How Emergency Medicine Physician compares to other specialties among California providers
Medicare quality performance, MIPS
David Williams's 2023 MIPS final score plotted against the Emergency Medicine Physician national average
- MIPS Final Score
- 94.6/100
- 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 | 1518012954 |
|---|---|
| Specialty | Emergency Medicine Physician |
| Gender | Male |
| NPI Issued | 01/24/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
94.6267
Final Score
Measured-score avg: 83.5
76.6789
Quality
97.1443
Cost
Reporting: Group practice
Hospital and facility affiliations
Facilities where David Williams 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.
Cep America - California
Greenbrae, 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 David Williams. To verify David Williams'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.
271
Total Claims
$6K
Total Drug Cost
162
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 282
- Total Day Supply
- 3,221
- Generic Drug Cost
- $4K
- Opioid Claims
- 49 (18.1% rate)
- Antibiotic Claims
- 115
Patient Demographics
- Average Patient Age
- 73.6 years
- Avg HCC Risk Score
- 1.43
- Gender Split
- 52% female / 48% male
- Age Distribution
- <65: 13, 65-74: 71, 75-84: 59, 85+: 19
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What David Williams prescribes most
Top Medicare Part D drugs by claim count, 2023
- Oxycodone-Acetamin…
Oxycodone-Acetaminophen
49 claims
- Cephalexin
Cephalexin
39 claims
- Doxycycline Hyclate
Doxycycline Hyclate
21 claims
- Ondansetron Odt
Ondansetron Odt
21 claims
- Amoxicillin-Clavul… 19
Amoxicillin-Clavulanate Potass
19 claims
- Doxycycline Monohy… 19
Doxycycline Monohydrate
19 claims
- Mupirocin 19
Mupirocin
19 claims
| Drug | Claims |
|---|---|
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 49 |
| Cephalexin | 39 |
| Doxycycline Hyclate | 21 |
| Ondansetron Odt Ondansetron | 21 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 19 |
| Doxycycline Monohydrate | 19 |
| Mupirocin | 19 |
* 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 David Williams 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
David Williams's 271 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 Williams, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (94.6 here).
Same NPPES enumeration year (2007)
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 Williams.
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 David Williams's specialty? ▼
David Williams specializes in Emergency Medicine Physician and practices in Los Angeles, California.
How much does David Williams prescribe under Medicare Part D? ▼
In 2023, David Williams wrote 271 Medicare Part D claims totaling $6K in drug costs for 162 beneficiaries.
What is David Williams's Medicare quality score? ▼
David Williams has a CMS MIPS Final Score of 94.6/100 (Quality: 76.7, Cost: 97.1). 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 David Williams located? ▼
David Williams is located at 1200 N STATE ST, Los Angeles, CA, 90033. Phone: (323) 226-2170.
What is David Williams's NPI number? ▼
David Williams's National Provider Identifier (NPI) is 1518012954, issued on 01/24/2007.
Does David Williams prescribe opioids? ▼
Yes, David Williams had 49 opioid claims in 2023 with an opioid prescribing rate of 18.1%.
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 David Williams prescribe most often? ▼
Based on 2023 Medicare Part D data, David Williams's most frequently prescribed drugs include Oxycodone-Acetaminophen, Cephalexin, Doxycycline Hyclate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does David Williams accept Medicare? ▼
David Williams appears in CMS Medicare data with 271 Part D claims and 162 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify David Williams's credentials? ▼
David Williams's NPI is 1518012954. 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.