NPI registry status
Active
2026 NPPES data Hospitalist Physician NPI 1144896432 MD
Verify on CMS → Mason Arbabi, MD
Hospitalist Physician in Lexington, Kentucky.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,825 in Hospitalist 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
27
Medicare Part D claims · 11 beneficiaries · Hospitalist Physician avg: 888
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mason Arbabi, MD filed 27 Medicare Part D claims in 2023 as a Hospitalist Physician in Lexington, Kentucky.
- 27
- Part D claims, 2023
- 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.
Mason Arbabi, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
27 0th percentile higher than 0% 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)
Mason Arbabi, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - 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 Mason Arbabi, MD?
Quality data not reportedPrimary specialty
Hospitalist Physician
Medicare Part D claims
27 97% vs specialty avg
Specialty distribution in Kentucky
How Hospitalist Physician compares to other specialties among Kentucky 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 Hospitalist 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).
Mason Arbabi, MD appears in the CMS NPPES registry as a Hospitalist Physician provider holding MD credentials at 800 ROSE ST, Lexington, KY, 40536, with a listed phone of (859) 323-6047. NPI 1144896432 was issued on 05/27/2021.
Medicare Part D records for calendar year 2023 show 27 prescription claims written by this provider, covering 11 Medicare beneficiaries and totaling roughly $931 in drug spend.
Hospitalist Physician is a mid-sized specialty nationwide, with 16,825 enrolled providers across 54 states and an average of 888 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 | 1144896432 |
|---|---|
| Specialty | Hospitalist Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/27/2021 |
Hospital and facility affiliations
Facilities where Mason Arbabi, 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.
Banner-University Medical Group
Tucson, AZ
Kentucky Medical Services Foundation, Inc
Lexington, KY
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
27
Total Claims
$931
Total Drug Cost
11
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 27
- Total Day Supply
- 765
- Generic Drug Cost
- $330
Patient Demographics
- Average Patient Age
- 74.1 years
- Avg HCC Risk Score
- 4.58
Hospitalist Physician Overview
How Mason Arbabi, MD fits within the Hospitalist Physician landscape nationally.
16,825
Hospitalist Physician Providers in US
54
States with Hospitalist Physician
888
Avg Claims per Provider
Mason Arbabi, MD's 27 claims are below the specialty average of 888.
Nearby Hospitalist Physician Providers in Kentucky
Other clinicians with the same primary specialty enrolled in Kentucky, drawn from the same CMS NPPES roster as Arbabi.
Dr. Syed Abbas
MD
Louisville, KY
Dr. Abdel Kareem Abu Malouh
MD
Louisville, KY
Dr. Robert Adams
MBBS
Madisonville, KY
Dr. Mouhamad Addas
MD
Louisville, KY
Dr. Vivekananda Adike
M.D.,
Florence, KY
Compare Hospitalist 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 Kentucky medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hospitalist 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
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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 Kentucky
Frequently Asked Questions
What is Mason Arbabi, MD's specialty? ▼
Mason Arbabi, MD specializes in Hospitalist Physician and practices in Lexington, Kentucky. Credentials: MD.
How much does Mason Arbabi, MD prescribe under Medicare Part D? ▼
In 2023, Mason Arbabi, MD wrote 27 Medicare Part D claims totaling $931 in drug costs for 11 beneficiaries.
Where is Mason Arbabi, MD located? ▼
Mason Arbabi, MD is located at 800 ROSE ST, Lexington, KY, 40536. Phone: (859) 323-6047.
What is Mason Arbabi, MD's NPI number? ▼
Mason Arbabi, MD's National Provider Identifier (NPI) is 1144896432, issued on 05/27/2021.
How many Hospitalist Physician providers are there in the US? ▼
There are 16,825 Hospitalist Physician providers across 54 states in the US. The average Hospitalist Physician provider writes 888 Medicare Part D claims per year.
Does Mason Arbabi, MD accept Medicare? ▼
Mason Arbabi, MD appears in CMS Medicare data with 27 Part D claims and 11 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mason Arbabi, MD's credentials? ▼
Mason Arbabi, MD's NPI is 1144896432 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.