2026 NPPES data Neuromuscular Medicine (Psychiatry & Neurology) Physician NPI 1669495149 MD
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WILLIAM BUXTON, MD

Neuromuscular Medicine (Psychiatry & Neurology) Physician in SANTA MONICA, California. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
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)
What the federal data reveals: WILLIAM BUXTON, MD is a Neuromuscular Medicine (Psychiatry & Neurology) Physician ([object Object]) practicing in SANTA MONICA, California with a Medicare Part D prescribing footprint of 730 claims across 145 beneficiaries — 25% brand-name prescribing . Industry payments of $689.45 across 28 transactions are disclosed under CMS Open Payments (Sunshine Act).

What stands out: WILLIAM BUXTON, MD filed 730 Medicare Part D claims in 2023 across SANTA MONICA, California. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

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).

WILLIAM BUXTON, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 07/25/2006

NPI 1669495149

Primary specialty

Neuromuscular Medicine (Psychiatry & Neurology) Physician

Rare

336 US NPIs in this specialty

Medicare Part D claims

730 22% vs specialty avg

2023 prescription claims

Specialty avg: 931

Specialty distribution in California

How Neuromuscular Medicine (Psychiatry & Neurology) Physician compares to other specialties among California providers

California providers

Neuromuscular Medicine (Psychiatry & Neurology) Physician share within California

1. Neuromuscular Medicine (Psychiatry & Neurology) Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Neuromuscular Medicine (Psychiatry & Neurology) Physician share within California

Specialty board-certification context

Estimated specialty board-certified rate — Neuromuscular Medicine (Psychiatry & Neurology) Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Neuromuscular Medicine (Psychiatry & Neurology) Physician ABMS/AOA estimate

Est. board-certified rate (Neuromuscular Medicine (Psychiatry & Neurology) Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Neuromuscular Medicine (Psychiatry & Neurology) Physician) — ABMS / AOA estimate

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 is a Neuromuscular Medicine (Psychiatry & Neurology) Physician provider practicing in SANTA MONICA, California, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1669495149. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

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. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what BUXTON most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

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%. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Neuromuscular Medicine (Psychiatry & Neurology) Physician is a narrow specialty nationwide, with 336 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

1301 20TH ST STE 150
SANTA MONICA, CA 90404

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%
Specialty average (est.)

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.

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.

Neuromuscular Medicine (Psychiatry & Neurology) Physician Overview

How WILLIAM BUXTON, MD fits within the Neuromuscular Medicine (Psychiatry & Neurology) Physician landscape nationally.

336
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.

Compare Neuromuscular Medicine (Psychiatry & Neurology) Physician nationally: see state-by-state distribution →

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 336 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

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