NPI registry status
Active
2026 NPPES data Neuro-ophthalmology Physician NPI 1134166051 MD
Verify on CMS → Gregory Vanstavern, MD
Neuro-ophthalmology Physician in Saint Louis, Missouri.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 128 in Neuro-ophthalmology 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
325
Medicare Part D claims · 67 beneficiaries · Neuro-ophthalmology Physician avg: 419
MIPS score
79.3/100
▼ 4 pts below national avg 83.1 · Above neutral
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Gregory Vanstavern, MD reported a CMS MIPS final score of 79.3/100 - below the 83.1 national average - and filed 325 Medicare Part D claims in 2023.
- 79.3/100
- MIPS score · -4 vs avg
- 325
- 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.
Gregory Vanstavern, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
79 30th percentile higher than 30% 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 Vanstavern, MD sits
This provider among neuro-ophthalmology physician peers
Across the 49 neuro-ophthalmology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Gregory Vanstavern, MD writes more Part D claims than 67% of them and scores higher on MIPS quality than 24% - placing this provider in the high-volume, lower-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 neuro-ophthalmology physician peer from a representative sample of 48; the gold marker is Gregory Vanstavern, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Gregory Vanstavern, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - 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 Vanstavern, MD?
Near national averagePrimary specialty
Neuro-ophthalmology Physician
Medicare Part D claims
325 22% vs specialty avg
MIPS final score
79.3/100 3.8 pts vs avg
Specialty distribution in Missouri
How Neuro-ophthalmology Physician compares to other specialties among Missouri providers
Medicare quality performance, MIPS
Gregory Vanstavern, MD's 2023 MIPS final score plotted against the Neuro-ophthalmology Physician national average
- MIPS Final Score
- 79.3/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Neuro-ophthalmology Physician) - 79.3/100 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 Vanstavern, MD appears in the CMS NPPES registry as a Neuro-ophthalmology Physician provider holding MD credentials at 4901 FOREST PARK AVE, Saint Louis, MO, 63108, with a listed phone of (314) 362-3937. NPI 1134166051 was issued on 05/31/2006.
Medicare Part D records for calendar year 2023 show 325 prescription claims written by this provider, covering 67 Medicare beneficiaries and totaling roughly $25K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 79.3/100 for the 2023 performance year (Quality 71.5, Cost 59.5), compared with the national average of 83.1.
Neuro-ophthalmology Physician is a narrow specialty nationwide, with 128 enrolled providers across 34 states and an average of 419 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 | 1134166051 |
|---|---|
| Specialty | Neuro-ophthalmology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/31/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
79.292
Final Score
Avg: 83.1
71.46
Quality
59.5132
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Gregory Vanstavern, 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.
Washington University
Saint Louis, MO
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.
325
Total Claims
$25K
Total Drug Cost
67
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 521
- Total Day Supply
- 15,249
- Generic Drug Cost
- $24K
Patient Demographics
- Average Patient Age
- 69.3 years
- Avg HCC Risk Score
- 1.45
- Gender Split
- 67% female / 33% 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 Vanstavern, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Pyridostigmine Bro…
Pyridostigmine Bromide
93 claims
- Prednisone
Prednisone
67 claims
- Gabapentin
Gabapentin
40 claims
- Topiramate 37
Topiramate
37 claims
- Acetazolamide Er 18
Acetazolamide Er
18 claims
- Glycopyrrolate 17
Glycopyrrolate
17 claims
- Clonazepam 15
Clonazepam
15 claims
| Drug | Claims |
|---|---|
| Pyridostigmine Bromide | 93 |
| Prednisone | 67 |
| Gabapentin | 40 |
| Topiramate | 37 |
| Acetazolamide Er Acetazolamide | 18 |
| Glycopyrrolate | 17 |
| Clonazepam | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Neuro-ophthalmology Physician Overview
How Gregory Vanstavern, MD fits within the Neuro-ophthalmology Physician landscape nationally.
128
Neuro-ophthalmology Physician Providers in US
34
States with Neuro-ophthalmology Physician
419
Avg Claims per Provider
Gregory Vanstavern, MD's 325 claims are below the specialty average of 419.
Nearby Neuro-ophthalmology Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Vanstavern.
Dr. Evan Jameyfield
MD
Saint Louis, MO
Dr. James Shepherd
MD
Saint Louis, MO
Dr. Douglas Snyder
MD
Saint Louis, MO
Dr. Leanne Stunkel
MD
Saint Louis, MO
Dr. Yunshuo Tang
MD
Saint Louis, MO
Compare Neuro-ophthalmology 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 Missouri medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Neuro-ophthalmology 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 Vanstavern, MD's specialty? ▼
Gregory Vanstavern, MD specializes in Neuro-ophthalmology Physician and practices in Saint Louis, Missouri. Credentials: MD.
How much does Gregory Vanstavern, MD prescribe under Medicare Part D? ▼
In 2023, Gregory Vanstavern, MD wrote 325 Medicare Part D claims totaling $25K in drug costs for 67 beneficiaries.
What is Gregory Vanstavern, MD's Medicare quality score? ▼
Gregory Vanstavern, MD has a CMS MIPS Final Score of 79.3/100 (Quality: 71.5, Cost: 59.5). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Gregory Vanstavern, MD located? ▼
Gregory Vanstavern, MD is located at 4901 FOREST PARK AVE, Saint Louis, MO, 63108. Phone: (314) 362-3937.
What is Gregory Vanstavern, MD's NPI number? ▼
Gregory Vanstavern, MD's National Provider Identifier (NPI) is 1134166051, issued on 05/31/2006.
How many Neuro-ophthalmology Physician providers are there in the US? ▼
There are 128 Neuro-ophthalmology Physician providers across 34 states in the US. The average Neuro-ophthalmology Physician provider writes 419 Medicare Part D claims per year.
What drugs does Gregory Vanstavern, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Gregory Vanstavern, MD's most frequently prescribed drugs include Pyridostigmine Bromide, Prednisone, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Vanstavern, MD accept Medicare? ▼
Gregory Vanstavern, MD appears in CMS Medicare data with 325 Part D claims and 67 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Vanstavern, MD's credentials? ▼
Gregory Vanstavern, MD's NPI is 1134166051 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.