NPI registry status
Active
2026 NPPES data Neurology Physician NPI 1558426619 MD
Verify on CMS → Gregory Wu, MD
Neurology 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 19,885 in Neurology 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
490
Medicare Part D claims · 42 beneficiaries · Neurology Physician avg: 1K
Generic prescribing
77%
generic claims · 23% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
79.3/100
▼ 4 pts below national avg 83.1 · Above neutral
Industry payments
$2.7K
9 payments · CMS Open Payments (Sunshine Act)
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 Wu, MD reported a CMS MIPS final score of 79.3/100 - below the 83.1 national average - and filed 490 Medicare Part D claims in 2023.
- 79.3/100
- MIPS score · -4 vs avg
- 490
- Part D claims, 2023
- 77%
- 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 Wu, 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 Wu, MD sits
This provider among neurology physician peers
Across the 5,437 neurology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Gregory Wu, MD writes more Part D claims than 33% of them and scores higher on MIPS quality than 37% - placing this provider in the lower-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 neurology physician peer from a representative sample of 60; the gold marker is Gregory Wu, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Gregory Wu, 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 Wu, MD?
Near national averagePrimary specialty
Neurology Physician
Medicare Part D claims
490 63% vs specialty avg
MIPS final score
79.3/100 3.8 pts vs avg
Specialty distribution in Missouri
How Neurology Physician compares to other specialties among Missouri providers
Medicare quality performance, MIPS
Gregory Wu, MD's 2023 MIPS final score plotted against the Neurology Physician national average
- MIPS Final Score
- 79.3/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Neurology 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 Wu, MD appears in the CMS NPPES registry as a Neurology Physician provider holding MD credentials at 4921 PARKVIEW PL, Saint Louis, MO, 63110, with a listed phone of (314) 362-3293. NPI 1558426619 was issued on 12/27/2006.
Medicare Part D records for calendar year 2023 show 490 prescription claims written by this provider, covering 42 Medicare beneficiaries and totaling roughly $1.3 million in drug spend, split 23% brand-name and 77% generic by claim count. 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.
Neurology Physician is a mid-sized specialty nationwide, with 19,885 enrolled providers across 54 states and an average of 1,309 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 | 1558426619 |
|---|---|
| Specialty | Neurology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 12/27/2006 |
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 Wu, 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).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Gregory Wu, MD. Source: openpaymentsdata.cms.gov.
Total received
$2.7K
Largest payer
Genentech, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Typical
Gregory Wu, MD - brand share 23.0%
Neurology Physician average
23% brand-name claims vs 77% generic, on 490 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.
490
Total Claims
$1.3M
Total Drug Cost
42
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 722
- Total Day Supply
- 21,109
- Brand vs Generic
- 23% brand / 77% generic
- Brand Drug Cost
- $1.2M
- Generic Drug Cost
- $122K
Patient Demographics
- Average Patient Age
- 57.7 years
- Avg HCC Risk Score
- 1.72
- Gender Split
- 74% female / 26% male
- Age Distribution
- <65: 27, 65-74: N/A, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gregory Wu, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Baclofen
Baclofen
63 claims
- Dalfampridine Er
Dalfampridine Er
48 claims
- Amitriptyline Hcl
Amitriptyline Hcl
33 claims
- Gabapentin
Gabapentin
32 claims
- Pregabalin 23
Pregabalin
23 claims
- Amantadine 21
Amantadine
21 claims
- Copaxone 21
Copaxone
21 claims
- Duloxetine Hcl 20
Duloxetine Hcl
20 claims
| Drug | Claims |
|---|---|
| Baclofen | 63 |
| Dalfampridine Er Dalfampridine | 48 |
| Amitriptyline Hcl | 33 |
| Gabapentin | 32 |
| Pregabalin | 23 |
| Amantadine Amantadine Hcl | 21 |
| Copaxone Glatiramer Acetate | 21 |
| Duloxetine Hcl | 20 |
| Aubagio Teriflunomide | 17 |
| Vumerity Diroximel Fumarate | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Neurology Physician Overview
How Gregory Wu, MD fits within the Neurology Physician landscape nationally.
19,885
Neurology Physician Providers in US
54
States with Neurology Physician
1,309
Avg Claims per Provider
Gregory Wu, MD's 490 claims are below the specialty average of 1,309.
Nearby Neurology Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Wu.
Dr. Unknown Aakriti
MD
Columbia, MO
Dr. Ahmed Abbas
MD
Columbia, MO
Dr. Ahmed Abdelkader
MD
Chesterfield, MO
Dr. Waleed Raheem Abood Abood
M.D.
Columbia, MO
Dr. Nazik Abuelgasim
MD
Saint Louis, MO
Compare Neurology 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 Neurology 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 Wu, MD's specialty? ▼
Gregory Wu, MD specializes in Neurology Physician and practices in Saint Louis, Missouri. Credentials: MD.
How much does Gregory Wu, MD prescribe under Medicare Part D? ▼
In 2023, Gregory Wu, MD wrote 490 Medicare Part D claims totaling $1.3M in drug costs for 42 beneficiaries.
What is Gregory Wu, MD's Medicare quality score? ▼
Gregory Wu, 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 Wu, MD located? ▼
Gregory Wu, MD is located at 4921 PARKVIEW PL, Saint Louis, MO, 63110. Phone: (314) 362-3293.
What is Gregory Wu, MD's NPI number? ▼
Gregory Wu, MD's National Provider Identifier (NPI) is 1558426619, issued on 12/27/2006.
Does Gregory Wu, MD prescribe more brand-name or generic drugs? ▼
Gregory Wu, MD's prescribing is 23% brand-name and 77% generic drugs by claim count, with $1.2M in brand drug costs.
How many Neurology Physician providers are there in the US? ▼
There are 19,885 Neurology Physician providers across 54 states in the US. The average Neurology Physician provider writes 1,309 Medicare Part D claims per year.
What drugs does Gregory Wu, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Gregory Wu, MD's most frequently prescribed drugs include Baclofen, Dalfampridine Er, Amitriptyline Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Wu, MD accept Medicare? ▼
Gregory Wu, MD appears in CMS Medicare data with 490 Part D claims and 42 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Wu, MD's credentials? ▼
Gregory Wu, MD's NPI is 1558426619 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.