NPI registry status
Active
2026 NPPES data Clinical Neurophysiology Physician NPI 1962666545 MD, PHD
Verify on CMS → Mason Leeman-Markowski, MD, PHD
Clinical Neurophysiology Physician in Farmington, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 650 in Clinical Neurophysiology 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
574
Medicare Part D claims · 121 beneficiaries · Clinical Neurophysiology Physician avg: 2K
Generic prescribing
94%
generic claims · 6% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
79.3/100
▼ 4 pts below national avg 83.5 · Above neutral
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Mason Leeman-Markowski, MD, PHD reported a CMS MIPS final score of 79.3/100 - below the 83.5 national average - and filed 574 Medicare Part D claims in 2024.
- 79.3/100
- MIPS score · -4 vs avg
- 574
- Part D claims, 2024
- 94%
- generic prescribing
- 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.
Federal trust snapshot
What official records show about Mason Leeman-Markowski, MD, PHD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1962666545), first enumerated 07/14/2008.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 574 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 79.3/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1962666545 · Clinical Neurophysiology Physician
NPI-10 · ENUM-MID · TAX-NARROW · MIPS-BELOW · RX-LIGHT · BOOK-THIN · PHOTO-FINISH
- NPI-10 1962666545
- ENUM-MID 2008
- TAX-NARROW 650
- MIPS-BELOW 79.3/100
- RX-LIGHT 574
- BOOK-THIN 14 in Connecticut
- PHOTO-FINISH Muhammad Al-Lozi, MD · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Enrico Vintayen,…
Enrico Vintayen, MD
78.8 MIPS pts
- Leeman-Markowski…
Leeman-Markowski · this provider
79.3 MIPS pts
- Muhammad Al-Lozi…
Muhammad Al-Lozi, MD
79.3 MIPS pts
- Gloria Galloway,…
Gloria Galloway, MD
79.4 MIPS pts
- Naiara Garcia Lo…
Naiara Garcia Losarcos, M.D.
79.5 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Mason Leeman-Markowski, MD, PHD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
79 ≥ 26th percentile 26% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. 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.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Mason Leeman-Markowski, MD, PHD sits
This provider among clinical neurophysiology physician peers
Across the 176 clinical neurophysiology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Mason Leeman-Markowski, MD, PHD writes more Part D claims than 34% of them and scores higher on MIPS quality than 30% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one clinical neurophysiology physician peer from a representative sample of 60; the gold marker is Mason Leeman-Markowski, MD, PHD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Mason Leeman-Markowski, MD, PHD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Leeman-Markowski, MD, PHD?
Near national averagePrimary specialty
Clinical Neurophysiology Physician
Medicare Part D claims
574 64% vs specialty avg
MIPS final score
79.3/100 4.2 pts vs avg
Specialty distribution in Connecticut
How Clinical Neurophysiology Physician compares to other specialties among Connecticut providers
Medicare quality performance, MIPS
Mason Leeman-Markowski, MD, PHD's 2023 MIPS final score plotted against the Clinical Neurophysiology Physician national average
- MIPS Final Score
- 79.3/100
- vs 83.5 national avg · 2023 performance year
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).
Practice Address
Provider Details
| NPI | 1962666545 |
|---|---|
| Specialty | Clinical Neurophysiology Physician |
| Credentials | MD, PHD |
| Gender | Male |
| NPI Issued | 07/14/2008 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
79.3496
Final Score
Measured-score avg: 83.5
69.2231
Quality
48.0871
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Mason Leeman-Markowski, MD, PHD 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.
Bristol Hospital Multi Specialty Group, Inc.
Bristol, CT
University OF Connecticut Health Center
Farmington, CT
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 · Generic-heavy
Mason Leeman-Markowski, MD, PHD - brand share 6.0%
Clinical Neurophysiology Physician average
6% brand-name claims vs 94% generic, on 574 2024 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 2024.
574
Total Claims
$62K
Total Drug Cost
121
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,147.067
- Total Day Supply
- 33,502
- Brand vs Generic
- 6% brand / 94% generic
- Brand Drug Cost
- $33K
- Generic Drug Cost
- $29K
Patient Demographics
- Average Patient Age
- 67.4 years
- Avg HCC Risk Score
- 1.65
- Gender Split
- 55% female / 45% male
- Age Distribution
- <65: 38, 65-74: 42, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Mason Leeman-Markowski, MD, PHD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Levetiracetam
Levetiracetam
123 claims
- Atorvastatin Calcium
Atorvastatin Calcium
56 claims
- Lacosamide
Lacosamide
56 claims
- Topiramate 36
Topiramate
36 claims
- Eliquis 28
Eliquis
28 claims
- Divalproex Sodium Er 27
Divalproex Sodium Er
27 claims
- Clopidogrel 26
Clopidogrel
26 claims
- Gabapentin 23
Gabapentin
23 claims
| Drug | Claims |
|---|---|
| Levetiracetam | 123 |
| Atorvastatin Calcium | 56 |
| Lacosamide | 56 |
| Topiramate | 36 |
| Eliquis Apixaban | 28 |
| Divalproex Sodium Er Divalproex Sodium | 27 |
| Clopidogrel Clopidogrel Bisulfate | 26 |
| Gabapentin | 23 |
| Clobazam | 22 |
| Lamotrigine | 19 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Clinical Neurophysiology Physician in CT →
All providers in Connecticut →
Compare specialties →
Clinical Neurophysiology Physician Overview
How Mason Leeman-Markowski, MD, PHD fits within the Clinical Neurophysiology Physician landscape nationally.
650
Clinical Neurophysiology Physician Providers in US
50
States with Clinical Neurophysiology Physician
1,582
Avg Claims per Provider
Mason Leeman-Markowski, MD, PHD's 574 claims are below the specialty average of 1,582.
Nationwide Clinical Neurophysiology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Leeman-Markowski, both outside Connecticut so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (79.3 here).
Same NPPES enumeration year (2008)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Clinical Neurophysiology Physician Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Leeman-Markowski.
One of 14 Clinical Neurophysiology Physician providers enrolled in Connecticut, 5 are shown here.
Dr. Hamada Altalib
D.O.,M.P.H.
West Haven, CT
Dr. Charles Guardia
M.D.
Danbury, CT
Dr. Joseph Haddad
DHSC
Glastonbury, CT
Dr. Mayer Hasbani
MD
New Haven, CT
Dr. Moshe Hasbani
MD
New Haven, CT
Compare Clinical Neurophysiology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Mason Leeman-Markowski, MD, PHD's specialty? ▼
Mason Leeman-Markowski, MD, PHD specializes in Clinical Neurophysiology Physician and practices in Farmington, Connecticut. Credentials: MD, PHD.
How much does Mason Leeman-Markowski, MD, PHD prescribe under Medicare Part D? ▼
In 2024, Mason Leeman-Markowski, MD, PHD wrote 574 Medicare Part D claims totaling $62K in drug costs for 121 beneficiaries.
What is Mason Leeman-Markowski, MD, PHD's Medicare quality score? ▼
Mason Leeman-Markowski, MD, PHD has a CMS MIPS Final Score of 79.3/100 (Quality: 69.2, Cost: 48.1). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Mason Leeman-Markowski, MD, PHD located? ▼
Mason Leeman-Markowski, MD, PHD is located at 263 FARMINGTON AVE, Farmington, CT, 06030. Phone: (860) 679-4888.
What is Mason Leeman-Markowski, MD, PHD's NPI number? ▼
Mason Leeman-Markowski, MD, PHD's National Provider Identifier (NPI) is 1962666545, issued on 07/14/2008.
Does Mason Leeman-Markowski, MD, PHD prescribe more brand-name or generic drugs? ▼
Mason Leeman-Markowski, MD, PHD's prescribing is 6% brand-name and 94% generic drugs by claim count, with $33K in brand drug costs.
How many Clinical Neurophysiology Physician providers are there in the US? ▼
There are 650 Clinical Neurophysiology Physician providers across 50 states in the US. The average Clinical Neurophysiology Physician provider writes 1,582 Medicare Part D claims per year.
What drugs does Mason Leeman-Markowski, MD, PHD prescribe most often? ▼
Based on 2024 Medicare Part D data, Mason Leeman-Markowski, MD, PHD's most frequently prescribed drugs include Levetiracetam, Atorvastatin Calcium, Lacosamide. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mason Leeman-Markowski, MD, PHD accept Medicare? ▼
Mason Leeman-Markowski, MD, PHD appears in CMS Medicare data with 574 Part D claims and 121 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mason Leeman-Markowski, MD, PHD's credentials? ▼
Mason Leeman-Markowski, MD, PHD's NPI is 1962666545 with credentials MD, PHD. 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 (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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 August 2026 (NPPES) / 2024 (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
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 August 2026.