NPI registry status
Active
2026 NPPES data Medical Physician Assistant NPI 1437609377 PA-C
Verify on CMS → Clay Walker, PA-C
Medical Physician Assistant in Scottsdale, Arizona.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 40,527 in Medical Physician Assistant, 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
793
Medicare Part D claims · 261 beneficiaries · Medical Physician Assistant avg: 1K
Industry payments
$4.0K
6 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Clay Walker, PA-C filed 793 Medicare Part D claims in 2023 as a Medical Physician Assistant in Scottsdale, Arizona.
- 793
- Part D claims, 2023
- $4.0K
- 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.
Clay Walker, PA-C's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
793 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
What does the federal data show about Clay Walker, PA-C?
Quality data not reportedPrimary specialty
Medical Physician Assistant
Medicare Part D claims
793 26% vs specialty avg
Specialty distribution in Arizona
How Medical Physician Assistant compares to other specialties among Arizona 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 Medical Physician Assistant. 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).
Clay Walker, PA-C appears in the CMS NPPES registry as a Medical Physician Assistant provider holding PA-C credentials at 13400 E SHEA BLVD, Scottsdale, AZ, 85259, with a listed phone of (480) 301-8000. NPI 1437609377 was issued on 10/04/2016.
Medicare Part D records for calendar year 2023 show 793 prescription claims written by this provider, covering 261 Medicare beneficiaries and totaling roughly $70K in drug spend.
Medical Physician Assistant is a mid-sized specialty nationwide, with 40,527 enrolled providers across 55 states and an average of 1,077 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 | 1437609377 |
|---|---|
| Specialty | Medical Physician Assistant |
| Credentials | PA-C |
| Gender | Male |
| NPI Issued | 10/04/2016 |
Hospital and facility affiliations
Facilities where Clay Walker, PA-C 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.
Mayo Clinic Arizona
Scottsdale, AZ
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 Clay Walker, PA-C. Source: openpaymentsdata.cms.gov.
Total received
$4.0K
Largest payer
GlaxoSmithKline, LLC.
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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
793
Total Claims
$70K
Total Drug Cost
261
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,902
- Total Day Supply
- 54,815
- Generic Drug Cost
- $10K
- Antibiotic Claims
- 25
Patient Demographics
- Average Patient Age
- 69.7 years
- Avg HCC Risk Score
- 0.75
- Gender Split
- 52% female / 48% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Clay Walker, PA-C prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
75 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
65 claims
- Amlodipine Besylate
Amlodipine Besylate
46 claims
- Levothyroxine Sodium
Levothyroxine Sodium
33 claims
- Losartan Potassium
Losartan Potassium
32 claims
- Lisinopril
Lisinopril
31 claims
- Tamsulosin Hcl 22
Tamsulosin Hcl
22 claims
- Hydrochlorothiazide 19
Hydrochlorothiazide
19 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 75 |
| Rosuvastatin Calcium | 65 |
| Amlodipine Besylate | 46 |
| Levothyroxine Sodium | 33 |
| Losartan Potassium | 32 |
| Lisinopril | 31 |
| Tamsulosin Hcl | 22 |
| Hydrochlorothiazide | 19 |
| Metformin Hcl | 14 |
| Allopurinol | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Medical Physician Assistant Overview
How Clay Walker, PA-C fits within the Medical Physician Assistant landscape nationally.
40,527
Medical Physician Assistant Providers in US
55
States with Medical Physician Assistant
1,077
Avg Claims per Provider
Clay Walker, PA-C's 793 claims are below the specialty average of 1,077.
Nearby Medical Physician Assistant Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Walker.
Dr. Michael Abraham
PA-C
Phoenix, AZ
Dr. Elaine Accomando
PA
Cottonwood, AZ
Dr. Jesus Acero
PA
Phoenix, AZ
Dr. Mica Adair
PA
Prescott Valley, AZ
Dr. Sarah Adamo
PA-C
Gilbert, AZ
Compare Medical Physician Assistant 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 Arizona medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Medical Physician Assistant 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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Medical Specialties Explained
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How insurance networks affect your costs
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Frequently Asked Questions
What is Clay Walker, PA-C's specialty? ▼
Clay Walker, PA-C specializes in Medical Physician Assistant and practices in Scottsdale, Arizona. Credentials: PA-C.
How much does Clay Walker, PA-C prescribe under Medicare Part D? ▼
In 2023, Clay Walker, PA-C wrote 793 Medicare Part D claims totaling $70K in drug costs for 261 beneficiaries.
Where is Clay Walker, PA-C located? ▼
Clay Walker, PA-C is located at 13400 E SHEA BLVD, Scottsdale, AZ, 85259. Phone: (480) 301-8000.
What is Clay Walker, PA-C's NPI number? ▼
Clay Walker, PA-C's National Provider Identifier (NPI) is 1437609377, issued on 10/04/2016.
How many Medical Physician Assistant providers are there in the US? ▼
There are 40,527 Medical Physician Assistant providers across 55 states in the US. The average Medical Physician Assistant provider writes 1,077 Medicare Part D claims per year.
What drugs does Clay Walker, PA-C prescribe most often? ▼
Based on 2023 Medicare Part D data, Clay Walker, PA-C's most frequently prescribed drugs include Atorvastatin Calcium, Rosuvastatin Calcium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Clay Walker, PA-C accept Medicare? ▼
Clay Walker, PA-C appears in CMS Medicare data with 793 Part D claims and 261 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Clay Walker, PA-C's credentials? ▼
Clay Walker, PA-C's NPI is 1437609377 with credentials PA-C. 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.