NPI registry status
Active
2026 NPPES data Nuclear Cardiology Physician NPI 1245250323 MD
Verify on CMS → Gregory Reiser, MD
Nuclear Cardiology Physician in Oshkosh, Wisconsin.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 374 in Nuclear Cardiology 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
200
Medicare Part D claims · 66 beneficiaries · Nuclear Cardiology Physician avg: 4K
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
100/100
▲ 17 pts above national avg 83.1 · Exceptional
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 Reiser, MD reported a CMS MIPS final score of 100/100 - above the 83.1 national average - and filed 200 Medicare Part D claims in 2023.
- 100/100
- MIPS score · +17 vs avg
- 200
- Part D claims, 2023
- 91%
- 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.
Gregory Reiser, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
100 Top 7% higher than 93% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Gregory Reiser, MD sits
This provider among nuclear cardiology physician peers
Across the 162 nuclear cardiology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Gregory Reiser, MD writes more Part D claims than 2% of them and scores higher on MIPS quality than 91% - placing this provider in the lower-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one nuclear cardiology physician peer from a representative sample of 60; the gold marker is Gregory Reiser, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Gregory Reiser, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Gregory Reiser, MD?
High performer (top quartile)Primary specialty
Nuclear Cardiology Physician
Medicare Part D claims
200 95% vs specialty avg
MIPS final score
100/100 16.9 pts vs avg
Specialty distribution in Wisconsin
How Nuclear Cardiology Physician compares to other specialties among Wisconsin providers
Medicare quality performance, MIPS
Gregory Reiser, MD's 2023 MIPS final score plotted against the Nuclear Cardiology Physician national average
- MIPS Final Score
- 100/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Nuclear Cardiology Physician) - 100/100 vs national avg 83.1
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 Reiser, MD appears in the CMS NPPES registry as a Nuclear Cardiology Physician provider holding MD credentials at 855 N WESTHAVEN DR, Oshkosh, WI, 54904, with a listed phone of (920) 303-8700. NPI 1245250323 was issued on 07/20/2006.
Medicare Part D records for calendar year 2023 show 200 prescription claims written by this provider, covering 66 Medicare beneficiaries and totaling roughly $23K in drug spend, split 9% brand-name and 91% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 100/100 for the 2023 performance year (Quality 90.8), compared with the national average of 83.1.
Nuclear Cardiology Physician is a narrow specialty nationwide, with 374 enrolled providers across 37 states and an average of 4,019 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 | 1245250323 |
|---|---|
| Specialty | Nuclear Cardiology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/20/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
100
Final Score
Avg: 83.1
90.7649
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Brand vs generic prescribing mix · Generic-heavy
Gregory Reiser, MD - brand share 9.0%
Nuclear Cardiology Physician average
9% brand-name claims vs 91% generic, on 200 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.
200
Total Claims
$23K
Total Drug Cost
66
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 404
- Total Day Supply
- 11,501
- Brand vs Generic
- 9% brand / 91% generic
- Brand Drug Cost
- $19K
- Generic Drug Cost
- $4K
Patient Demographics
- Average Patient Age
- 74.7 years
- Avg HCC Risk Score
- 1.70
- Gender Split
- 62% female / 38% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gregory Reiser, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Metoprolol Succinate
Metoprolol Succinate
30 claims
- Furosemide
Furosemide
12 claims
- Atorvastatin Calcium 11
Atorvastatin Calcium
11 claims
- Eliquis 11
Eliquis
11 claims
- Potassium Chloride 11
Potassium Chloride
11 claims
| Drug | Claims |
|---|---|
| Metoprolol Succinate | 30 |
| Furosemide | 12 |
| Atorvastatin Calcium | 11 |
| Eliquis Apixaban | 11 |
| Potassium Chloride | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nuclear Cardiology Physician Overview
How Gregory Reiser, MD fits within the Nuclear Cardiology Physician landscape nationally.
374
Nuclear Cardiology Physician Providers in US
37
States with Nuclear Cardiology Physician
4,019
Avg Claims per Provider
Gregory Reiser, MD's 200 claims are below the specialty average of 4,019.
Nearby Nuclear Cardiology Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Reiser.
Dr. Abraham-Rami Gal
MD
Milwaukee, WI
Dr. Tamara Hagen
MD
Madison, WI
Dr. Eugene Kaji
MD PHD
Fitchburg, WI
Anthony Locurto
Kenosha, WI
Dr. Ijaz Malik
MD
Milwaukee, WI
Compare Nuclear Cardiology 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 Wisconsin medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Nuclear Cardiology 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.
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Frequently Asked Questions
What is Gregory Reiser, MD's specialty? ▼
Gregory Reiser, MD specializes in Nuclear Cardiology Physician and practices in Oshkosh, Wisconsin. Credentials: MD.
How much does Gregory Reiser, MD prescribe under Medicare Part D? ▼
In 2023, Gregory Reiser, MD wrote 200 Medicare Part D claims totaling $23K in drug costs for 66 beneficiaries.
What is Gregory Reiser, MD's Medicare quality score? ▼
Gregory Reiser, MD has a CMS MIPS Final Score of 100/100 (Quality: 90.8). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Gregory Reiser, MD located? ▼
Gregory Reiser, MD is located at 855 N WESTHAVEN DR, Oshkosh, WI, 54904. Phone: (920) 303-8700.
What is Gregory Reiser, MD's NPI number? ▼
Gregory Reiser, MD's National Provider Identifier (NPI) is 1245250323, issued on 07/20/2006.
Does Gregory Reiser, MD prescribe more brand-name or generic drugs? ▼
Gregory Reiser, MD's prescribing is 9% brand-name and 91% generic drugs by claim count, with $19K in brand drug costs.
How many Nuclear Cardiology Physician providers are there in the US? ▼
There are 374 Nuclear Cardiology Physician providers across 37 states in the US. The average Nuclear Cardiology Physician provider writes 4,019 Medicare Part D claims per year.
What drugs does Gregory Reiser, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Gregory Reiser, MD's most frequently prescribed drugs include Metoprolol Succinate, Furosemide, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Reiser, MD accept Medicare? ▼
Gregory Reiser, MD appears in CMS Medicare data with 200 Part D claims and 66 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Reiser, MD's credentials? ▼
Gregory Reiser, MD's NPI is 1245250323 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.
- 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 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.