NPI registry status
Active
2026 NPPES data Neuromuscular Medicine (Psychiatry & Neurology) Physician NPI 1669495149 MD
Verify on CMS → William Buxton, MD
Neuromuscular Medicine (Psychiatry & Neurology) Physician in Santa Monica, 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 338 in Neuromuscular Medicine (Psychiatry & Neurology) 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
730
Medicare Part D claims · 145 beneficiaries · Neuromuscular Medicine (Psychiatry & Neurology) Physician avg: 931
Generic prescribing
75%
generic claims · 25% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$689.45
28 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
William Buxton, MD filed 730 Medicare Part D claims in 2023 as a Neuromuscular Medicine (Psychiatry & Neurology) Physician in Santa Monica, California, prescribing 75% generic.
- 730
- Part D claims, 2023
- 75%
- 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.
William Buxton, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
730 Top 29% higher than 71% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
William Buxton, 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 William Buxton, MD?
Quality data not reportedPrimary specialty
Neuromuscular Medicine (Psychiatry & Neurology) Physician
Medicare Part D claims
730 22% vs specialty avg
Specialty distribution in California
How Neuromuscular Medicine (Psychiatry & Neurology) 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 Neuromuscular Medicine (Psychiatry & Neurology) 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).
William Buxton, MD appears in the CMS NPPES registry as a Neuromuscular Medicine (Psychiatry & Neurology) Physician provider holding MD credentials at 1301 20TH ST STE 150, Santa Monica, CA, 90404, with a listed phone of (310) 582-7641. NPI 1669495149 was issued on 07/25/2006.
Medicare Part D records for calendar year 2023 show 730 prescription claims written by this provider, covering 145 Medicare beneficiaries and totaling roughly $2.9 million in drug spend, split 25% brand-name and 75% generic by claim count, with an opioid prescribing rate of 1.8%.
Neuromuscular Medicine (Psychiatry & Neurology) Physician is a narrow specialty nationwide, with 338 enrolled providers across 44 states and an average of 931 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 | 1669495149 |
|---|---|
| Specialty | Neuromuscular Medicine (Psychiatry & Neurology) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/25/2006 |
Hospital and facility affiliations
Facilities where William Buxton, 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.
Providence Saint Johns Medical Foundation
Santa Monica, 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 William Buxton, MD. Source: openpaymentsdata.cms.gov.
Total received
$689
Largest payer
UCB, 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 William Buxton, MD. To verify William Buxton, 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
William Buxton, MD - brand share 25.0%
Neuromuscular Medicine (Psychiatry & Neurology) Physician average
25% brand-name claims vs 75% generic, on 730 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.
730
Total Claims
$2.9M
Total Drug Cost
145
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,263
- Total Day Supply
- 36,137
- Brand vs Generic
- 25% brand / 75% generic
- Brand Drug Cost
- $2.8M
- Generic Drug Cost
- $32K
- Opioid Claims
- 13 (1.8% rate)
Patient Demographics
- Average Patient Age
- 75.0 years
- Avg HCC Risk Score
- 1.83
- Gender Split
- 59% female / 41% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Buxton, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Gabapentin
Gabapentin
140 claims
- Duloxetine Hcl
Duloxetine Hcl
119 claims
- Sodium Chloride
Sodium Chloride
61 claims
- Prednisone 47
Prednisone
47 claims
- Gammagard Liquid 40
Gammagard Liquid
40 claims
- Pregabalin 39
Pregabalin
39 claims
- Pyridostigmine Bro… 38
Pyridostigmine Bromide
38 claims
- Meloxicam 17
Meloxicam
17 claims
| Drug | Claims |
|---|---|
| Gabapentin | 140 |
| Duloxetine Hcl | 119 |
| Sodium Chloride 0.9 % Sodium Chloride | 61 |
| Prednisone | 47 |
| Gammagard Liquid Immun Glob G(Igg)/Gly/Iga Ov50 | 40 |
| Pregabalin | 39 |
| Pyridostigmine Bromide | 38 |
| Meloxicam | 17 |
| Octagam Immun Globg(Igg)/Malt/Iga Ov50 | 16 |
| Privigen Immun Glob G(Igg)/Pro/Iga 0-50 | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Neuromuscular Medicine (Psychiatry & Neurology) Physician in CA →
All providers in California →
Compare specialties →
Neuromuscular Medicine (Psychiatry & Neurology) Physician Overview
How William Buxton, MD fits within the Neuromuscular Medicine (Psychiatry & Neurology) Physician landscape nationally.
338
Neuromuscular Medicine (Psychiatry & Neurology) Physician Providers in US
44
States with Neuromuscular Medicine (Psychiatry & Neurology) Physician
931
Avg Claims per Provider
William Buxton, MD's 730 claims are below the specialty average of 931.
Nearby Neuromuscular Medicine (Psychiatry & Neurology) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Buxton.
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 Neuromuscular Medicine (Psychiatry & Neurology) 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.
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Frequently Asked Questions
What is William Buxton, MD's specialty? ▼
William Buxton, MD specializes in Neuromuscular Medicine (Psychiatry & Neurology) Physician and practices in Santa Monica, California. Credentials: MD.
How much does William Buxton, MD prescribe under Medicare Part D? ▼
In 2023, William Buxton, MD wrote 730 Medicare Part D claims totaling $2.9M in drug costs for 145 beneficiaries.
Where is William Buxton, MD located? ▼
William Buxton, MD is located at 1301 20TH ST STE 150, Santa Monica, CA, 90404. Phone: (310) 582-7641.
What is William Buxton, MD's NPI number? ▼
William Buxton, MD's National Provider Identifier (NPI) is 1669495149, issued on 07/25/2006.
Does William Buxton, MD prescribe more brand-name or generic drugs? ▼
William Buxton, MD's prescribing is 25% brand-name and 75% generic drugs by claim count, with $2.8M in brand drug costs.
Does William Buxton, MD prescribe opioids? ▼
Yes, William Buxton, MD had 13 opioid claims in 2023 with an opioid prescribing rate of 1.8%.
How many Neuromuscular Medicine (Psychiatry & Neurology) Physician providers are there in the US? ▼
There are 338 Neuromuscular Medicine (Psychiatry & Neurology) Physician providers across 44 states in the US. The average Neuromuscular Medicine (Psychiatry & Neurology) Physician provider writes 931 Medicare Part D claims per year.
What drugs does William Buxton, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, William Buxton, MD's most frequently prescribed drugs include Gabapentin, Duloxetine Hcl, Sodium Chloride. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Buxton, MD accept Medicare? ▼
William Buxton, MD appears in CMS Medicare data with 730 Part D claims and 145 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Buxton, MD's credentials? ▼
William Buxton, MD's NPI is 1669495149 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
Compiled from official public sources by the PlainDoctor editorial team.
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.