NPI registry status
Active
2026 NPPES data Clinical Neuropsychologist NPI 1073661310 M.D.
Verify on CMS → Gregory Kaczenski, M.D.
Clinical Neuropsychologist in Little Rock, 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 5,734 in Clinical Neuropsychologist, 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
233
Medicare Part D claims · Clinical Neuropsychologist avg: 877
Generic prescribing
73%
generic claims · 27% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Gregory Kaczenski, M.D. filed 233 Medicare Part D claims in 2023 as a Clinical Neuropsychologist in Little Rock, Arkansas, prescribing 73% generic.
- 233
- Part D claims, 2023
- 73%
- generic prescribing
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.
Gregory Kaczenski, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
233 49th percentile higher than 49% 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 Gregory Kaczenski, M.D.?
Quality data not reportedPrimary specialty
Clinical Neuropsychologist
Medicare Part D claims
233 73% vs specialty avg
Specialty distribution in Arkansas
How Clinical Neuropsychologist 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 Clinical Neuropsychologist. 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).
Gregory Kaczenski, M.D. appears in the CMS NPPES registry as a Clinical Neuropsychologist provider holding M.D. credentials at 801 SCOTT ST, Little Rock, AR, 72201, with a listed phone of (501) 221-7238. NPI 1073661310 was issued on 01/05/2007.
Medicare Part D records for calendar year 2023 show 233 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $38K in drug spend, split 27% brand-name and 73% generic by claim count.
Clinical Neuropsychologist is a mid-sized specialty nationwide, with 5,734 enrolled providers across 53 states and an average of 877 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 | 1073661310 |
|---|---|
| Specialty | Clinical Neuropsychologist |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 01/05/2007 |
Hospital and facility affiliations
Facilities where Gregory Kaczenski, M.D. 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.
Department OF State Hospitals
Coalinga, 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).
Brand vs generic prescribing mix · Above average
Gregory Kaczenski, M.D. - brand share 27.0%
Clinical Neuropsychologist average
27% brand-name claims vs 73% generic, on 233 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.
233
Total Claims
$38K
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 237
- Total Day Supply
- 6,011
- Brand vs Generic
- 27% brand / 73% generic
- Brand Drug Cost
- $36K
- Generic Drug Cost
- $2K
Patient Demographics
- Average Patient Age
- 71.2 years
- Avg HCC Risk Score
- 1.95
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gregory Kaczenski, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Terazosin Hcl
Terazosin Hcl
23 claims
- Haloperidol
Haloperidol
21 claims
- Quetiapine Fumarate
Quetiapine Fumarate
18 claims
- Furosemide
Furosemide
14 claims
- Entresto
Entresto
13 claims
- Jardiance
Jardiance
13 claims
| Drug | Claims |
|---|---|
| Terazosin Hcl | 23 |
| Haloperidol | 21 |
| Quetiapine Fumarate | 18 |
| Furosemide | 14 |
| Entresto Sacubitril/Valsartan | 13 |
| Jardiance Empagliflozin | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Clinical Neuropsychologist Overview
How Gregory Kaczenski, M.D. fits within the Clinical Neuropsychologist landscape nationally.
5,734
Clinical Neuropsychologist Providers in US
53
States with Clinical Neuropsychologist
877
Avg Claims per Provider
Gregory Kaczenski, M.D.'s 233 claims are below the specialty average of 877.
Nearby Clinical Neuropsychologist Providers in Arkansas
Other clinicians with the same primary specialty enrolled in Arkansas, drawn from the same CMS NPPES roster as Kaczenski.
Dr. Haley Aaron
PHD
Fayetteville, AR
Dr. Kristin Addison-Brown
PHD
Jonesboro, AR
Dr. Garrett Andrews
PSY.D
Little Rock, AR
Dr. Richard Back
PH.D
Fayetteville, AR
Dr. Masha Berman
PSY.D.
Little Rock, AR
Compare Clinical Neuropsychologist 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 Clinical Neuropsychologist 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 Gregory Kaczenski, M.D.'s specialty? ▼
Gregory Kaczenski, M.D. specializes in Clinical Neuropsychologist and practices in Little Rock, Arkansas. Credentials: M.D..
How much does Gregory Kaczenski, M.D. prescribe under Medicare Part D? ▼
In 2023, Gregory Kaczenski, M.D. wrote 233 Medicare Part D claims totaling $38K in drug costs for N/A beneficiaries.
Where is Gregory Kaczenski, M.D. located? ▼
Gregory Kaczenski, M.D. is located at 801 SCOTT ST, Little Rock, AR, 72201. Phone: (501) 221-7238.
What is Gregory Kaczenski, M.D.'s NPI number? ▼
Gregory Kaczenski, M.D.'s National Provider Identifier (NPI) is 1073661310, issued on 01/05/2007.
Does Gregory Kaczenski, M.D. prescribe more brand-name or generic drugs? ▼
Gregory Kaczenski, M.D.'s prescribing is 27% brand-name and 73% generic drugs by claim count, with $36K in brand drug costs.
How many Clinical Neuropsychologist providers are there in the US? ▼
There are 5,734 Clinical Neuropsychologist providers across 53 states in the US. The average Clinical Neuropsychologist provider writes 877 Medicare Part D claims per year.
What drugs does Gregory Kaczenski, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Gregory Kaczenski, M.D.'s most frequently prescribed drugs include Terazosin Hcl, Haloperidol, Quetiapine Fumarate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Kaczenski, M.D. accept Medicare? ▼
Gregory Kaczenski, M.D. appears in CMS Medicare data with 233 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Kaczenski, M.D.'s credentials? ▼
Gregory Kaczenski, M.D.'s NPI is 1073661310 with credentials M.D.. 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.