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 391 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
2K
Medicare Part D claims · 280 beneficiaries · Nuclear Cardiology Physician avg: 4K
Generic prescribing
83%
generic claims · 17% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
100/100
▲ 17 pts above national avg 83.5 · Exceptional
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Gregory Reiser, MD reported a CMS MIPS final score of 100/100 - above the 83.5 national average - and filed 1,555 Medicare Part D claims in 2024.
- 100/100
- MIPS score · +17 vs avg
- 2K
- Part D claims, 2024
- 83%
- 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 Gregory Reiser, MD
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 1245250323), first enumerated 07/20/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,555 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 100/100 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.
- 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 1245250323 · Nuclear Cardiology Physician
NPI-10 · ENUM-LEGACY · TAX-TRACE · MIPS-ELITE · RX-MID · BOOK-THIN · PHOTO-FINISH
- NPI-10 1245250323
- ENUM-LEGACY 2006
- TAX-TRACE 391
- MIPS-ELITE 100/100
- RX-MID 1,555
- BOOK-THIN 11 in Wisconsin
- PHOTO-FINISH Jennifer Chen · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Reiser · this pr…
Reiser · this provider
100 MIPS pts
- Manmohan Katapad…
Manmohan Katapadi, MD, FACC
100 MIPS pts
- Jennifer Chen · …
Jennifer Chen
100 MIPS pts
- Mark Finch, M.D.…
Mark Finch, M.D.
100 MIPS pts
- Elsa Giardina, M…
Elsa Giardina, M.D.
100 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Gregory Reiser, MD'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.
100 ≥ 92nd percentile 92% 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 Gregory Reiser, MD sits
This provider among nuclear cardiology physician peers
Across the 147 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 16% of them and scores higher on MIPS quality than 90% - placing this provider in the lower-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
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
1,555 63% vs specialty avg
MIPS final score
100/100 16.5 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 83.5 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 | 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
Measured-score avg: 83.5
90.7649
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Brand vs generic prescribing mix · Typical
Gregory Reiser, MD - brand share 17.0%
Nuclear Cardiology Physician average
17% brand-name claims vs 83% generic, on 1,555 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.
1,555
Total Claims
$269K
Total Drug Cost
280
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,401
- Total Day Supply
- 100,116
- Brand vs Generic
- 17% brand / 83% generic
- Brand Drug Cost
- $254K
- Generic Drug Cost
- $14K
Patient Demographics
- Average Patient Age
- 74.2 years
- Avg HCC Risk Score
- 1.77
- Gender Split
- 54% female / 46% male
- Age Distribution
- <65: 31, 65-74: 116, 75-84: 96, 85+: 37
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Gregory Reiser, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Metoprolol Succinate
Metoprolol Succinate
254 claims
- Furosemide
Furosemide
174 claims
- Eliquis
Eliquis
122 claims
- Losartan Potassium 92
Losartan Potassium
92 claims
- Atorvastatin Calcium 83
Atorvastatin Calcium
83 claims
- Spironolactone 75
Spironolactone
75 claims
- Entresto 55
Entresto
55 claims
- Amlodipine Besylate 53
Amlodipine Besylate
53 claims
| Drug | Claims |
|---|---|
| Metoprolol Succinate | 254 |
| Furosemide | 174 |
| Eliquis Apixaban | 122 |
| Losartan Potassium | 92 |
| Atorvastatin Calcium | 83 |
| Spironolactone | 75 |
| Entresto Sacubitril/Valsartan | 55 |
| Amlodipine Besylate | 53 |
| Metoprolol Tartrate | 49 |
| Nitroglycerin | 46 |
* 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.
391
Nuclear Cardiology Physician Providers in US
37
States with Nuclear Cardiology Physician
4,174
Avg Claims per Provider
Gregory Reiser, MD's 1,555 claims are below the specialty average of 4,174.
Nationwide Nuclear Cardiology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Reiser, both outside Wisconsin so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (100 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
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.
One of 11 Nuclear Cardiology Physician providers enrolled in Wisconsin, 5 are shown here.
Dr. Abraham-Rami Gal
MD
Milwaukee, WI
Dr. Tamara Hagen
MD
Madison, WI
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 →
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 2024, Gregory Reiser, MD wrote 1,555 Medicare Part D claims totaling $269K in drug costs for 280 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 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 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 17% brand-name and 83% generic drugs by claim count, with $254K in brand drug costs.
How many Nuclear Cardiology Physician providers are there in the US? ▼
There are 391 Nuclear Cardiology Physician providers across 37 states in the US. The average Nuclear Cardiology Physician provider writes 4,174 Medicare Part D claims per year.
What drugs does Gregory Reiser, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Gregory Reiser, MD's most frequently prescribed drugs include Metoprolol Succinate, Furosemide, Eliquis. 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 1,555 Part D claims and 280 Medicare beneficiaries in 2024. 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 (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.