NPI registry status
Active
2026 NPPES data Neurology Physician NPI 1346269180 MD
Verify on CMS → William Knubley, MD
Neurology Physician in Fort Smith, Arkansas.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 19,885 in 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
5K
Medicare Part D claims · 517 beneficiaries · Neurology Physician avg: 1K
Generic prescribing
83%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$1.6K
83 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 Knubley, MD filed 4,941 Medicare Part D claims in 2023 as a Neurology Physician in Fort Smith, Arkansas, prescribing 83% generic.
- 5K
- Part D claims, 2023
- 83%
- generic prescribing
- $1.6K
- industry payments (Sunshine Act)
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 Knubley, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
4,941 Top 6% higher than 94% 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-eligible specialty (heuristic, not verified)
William Knubley, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about William Knubley, MD?
Quality data not reportedPrimary specialty
Neurology Physician
Medicare Part D claims
4,941 277% vs specialty avg
Specialty distribution in Arkansas
How Neurology Physician compares to other specialties among Arkansas 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 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 Knubley, MD appears in the CMS NPPES registry as a Neurology Physician provider holding MD credentials at 6801 ROGERS AVE, Fort Smith, AR, 72903, with a listed phone of (479) 452-2077. NPI 1346269180 was issued on 07/19/2006.
Medicare Part D records for calendar year 2023 show 4,941 prescription claims written by this provider, covering 517 Medicare beneficiaries and totaling roughly $2.0 million in drug spend, split 16% brand-name and 83% generic by claim count.
Neurology Physician is a mid-sized specialty nationwide, with 19,885 enrolled providers across 54 states and an average of 1,309 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 | 1346269180 |
|---|---|
| Specialty | Neurology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/19/2006 |
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 Knubley, MD. Source: openpaymentsdata.cms.gov.
Total received
$1.6K
Largest payer
ABBVIE 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.
Brand vs generic prescribing mix · Typical
William Knubley, MD - brand share 16.0%
Neurology Physician average
16% brand-name claims vs 83% generic, on 4,941 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.
4,941
Total Claims
$2.0M
Total Drug Cost
517
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 6,811
- Total Day Supply
- 198,446
- Brand vs Generic
- 16% brand / 83% generic
- Brand Drug Cost
- $1.6M
- Generic Drug Cost
- $408K
Patient Demographics
- Average Patient Age
- 67.2 years
- Avg HCC Risk Score
- 1.68
- Gender Split
- 64% female / 36% male
- Age Distribution
- <65: 190, 65-74: 148, 75-84: 136, 85+: 43
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Knubley, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Memantine Hcl
Memantine Hcl
485 claims
- Donepezil Hcl
Donepezil Hcl
366 claims
- Levetiracetam
Levetiracetam
349 claims
- Gabapentin
Gabapentin
278 claims
- Carbidopa-Levodopa
Carbidopa-Levodopa
220 claims
- Lamotrigine 168
Lamotrigine
168 claims
- Lacosamide 162
Lacosamide
162 claims
- Primidone 151
Primidone
151 claims
| Drug | Claims |
|---|---|
| Memantine Hcl | 485 |
| Donepezil Hcl | 366 |
| Levetiracetam | 349 |
| Gabapentin | 278 |
| Carbidopa-Levodopa Carbidopa/Levodopa | 220 |
| Lamotrigine | 168 |
| Lacosamide | 162 |
| Primidone | 151 |
| Topiramate | 142 |
| Amitriptyline Hcl | 131 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Neurology Physician Overview
How William Knubley, MD fits within the Neurology Physician landscape nationally.
19,885
Neurology Physician Providers in US
54
States with Neurology Physician
1,309
Avg Claims per Provider
William Knubley, MD's 4,941 claims are above the specialty average of 1,309.
Nearby Neurology Physician Providers in Arkansas
Other clinicians with the same primary specialty enrolled in Arkansas, drawn from the same CMS NPPES roster as Knubley.
Dr. Pratibha Aia
M.D
Little Rock, AR
Dr. Ahmad Al-Khatib
MD
Bentonville, AR
Bernice Anderson
Batesville, AR
Dr. Robert Archer
MD
Little Rock, AR
Dr. Narenraj Arulprakash
MBBS
Little Rock, AR
Compare Neurology Physician nationally: see state-by-state distribution →
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 Arkansas medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Arkansas
Frequently Asked Questions
What is William Knubley, MD's specialty? ▼
William Knubley, MD specializes in Neurology Physician and practices in Fort Smith, Arkansas. Credentials: MD.
How much does William Knubley, MD prescribe under Medicare Part D? ▼
In 2023, William Knubley, MD wrote 4,941 Medicare Part D claims totaling $2.0M in drug costs for 517 beneficiaries.
Where is William Knubley, MD located? ▼
William Knubley, MD is located at 6801 ROGERS AVE, Fort Smith, AR, 72903. Phone: (479) 452-2077.
What is William Knubley, MD's NPI number? ▼
William Knubley, MD's National Provider Identifier (NPI) is 1346269180, issued on 07/19/2006.
Does William Knubley, MD prescribe more brand-name or generic drugs? ▼
William Knubley, MD's prescribing is 16% brand-name and 83% generic drugs by claim count, with $1.6M in brand drug costs.
How many Neurology Physician providers are there in the US? ▼
There are 19,885 Neurology Physician providers across 54 states in the US. The average Neurology Physician provider writes 1,309 Medicare Part D claims per year.
What drugs does William Knubley, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, William Knubley, MD's most frequently prescribed drugs include Memantine Hcl, Donepezil Hcl, Levetiracetam. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Knubley, MD accept Medicare? ▼
William Knubley, MD appears in CMS Medicare data with 4,941 Part D claims and 517 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Knubley, MD's credentials? ▼
William Knubley, MD's NPI is 1346269180 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.