NPI registry status
Active
2026 NPPES data Hematology (Internal Medicine) Physician NPI 1750309472 MD
Verify on CMS → Matthew Walter, MD
Hematology (Internal Medicine) 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 1,436 in Hematology (Internal Medicine) 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
109
Medicare Part D claims · 15 beneficiaries · Hematology (Internal Medicine) Physician avg: 693
Generic prescribing
74%
generic claims · 26% 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
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
Matthew Walter, MD reported a CMS MIPS final score of 79.3/100 - below the 83.1 national average - and filed 109 Medicare Part D claims in 2023.
- 79.3/100
- MIPS score · -4 vs avg
- 109
- Part D claims, 2023
- 74%
- 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.
Matthew Walter, 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 Matthew Walter, MD sits
This provider among hematology (internal medicine) physician peers
Across the 570 hematology (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Matthew Walter, MD writes more Part D claims than 14% of them and scores higher on MIPS quality than 40% - 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 hematology (internal medicine) physician peer from a representative sample of 60; the gold marker is Matthew Walter, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Matthew Walter, 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 Matthew Walter, MD?
Near national averagePrimary specialty
Hematology (Internal Medicine) Physician
Medicare Part D claims
109 84% vs specialty avg
MIPS final score
79.3/100 3.8 pts vs avg
Specialty distribution in Missouri
How Hematology (Internal Medicine) Physician compares to other specialties among Missouri providers
Medicare quality performance, MIPS
Matthew Walter, MD's 2023 MIPS final score plotted against the Hematology (Internal Medicine) Physician national average
- MIPS Final Score
- 79.3/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Hematology (Internal Medicine) 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).
Matthew Walter, MD appears in the CMS NPPES registry as a Hematology (Internal Medicine) Physician provider holding MD credentials at 4500 FOREST PARK AVE, Saint Louis, MO, 63108, with a listed phone of (314) 454-8304. NPI 1750309472 was issued on 07/18/2006.
Medicare Part D records for calendar year 2023 show 109 prescription claims written by this provider, covering 15 Medicare beneficiaries and totaling roughly $482K in drug spend, split 26% brand-name and 74% 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.
Hematology (Internal Medicine) Physician is a narrow specialty nationwide, with 1,436 enrolled providers across 50 states and an average of 693 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 | 1750309472 |
|---|---|
| Specialty | Hematology (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/18/2006 |
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 Matthew Walter, 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).
Brand vs generic prescribing mix · Above average
Matthew Walter, MD - brand share 26.0%
Hematology (Internal Medicine) Physician average
26% brand-name claims vs 74% generic, on 109 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.
109
Total Claims
$482K
Total Drug Cost
15
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 125
- Total Day Supply
- 3,362
- Brand vs Generic
- 26% brand / 74% generic
- Brand Drug Cost
- $416K
- Generic Drug Cost
- $66K
- Antibiotic Claims
- 16
Patient Demographics
- Average Patient Age
- 81.1 years
- Avg HCC Risk Score
- 2.81
- Age Distribution
- <65: 0, 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.
| Drug | Claims |
|---|---|
| Acyclovir | 14 |
| Escitalopram Oxalate | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Hematology (Internal Medicine) Physician in MO →
All providers in Missouri →
Compare specialties →
Hematology (Internal Medicine) Physician Overview
How Matthew Walter, MD fits within the Hematology (Internal Medicine) Physician landscape nationally.
1,436
Hematology (Internal Medicine) Physician Providers in US
50
States with Hematology (Internal Medicine) Physician
693
Avg Claims per Provider
Matthew Walter, MD's 109 claims are below the specialty average of 693.
Nearby Hematology (Internal Medicine) Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Walter.
Dr. Joseph Bennett
MD
Kansas City, MO
Dr. Paul Gill
M.D.
Springfield, MO
Dr. Anjum Hassan
MD
Saint Louis, MO
Dr. Scot Hickman
MD
Saint Louis, MO
Dr. Gregory Longmore
MD
Saint Louis, MO
Compare Hematology (Internal Medicine) 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 Hematology (Internal Medicine) 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 Matthew Walter, MD's specialty? ▼
Matthew Walter, MD specializes in Hematology (Internal Medicine) Physician and practices in Saint Louis, Missouri. Credentials: MD.
How much does Matthew Walter, MD prescribe under Medicare Part D? ▼
In 2023, Matthew Walter, MD wrote 109 Medicare Part D claims totaling $482K in drug costs for 15 beneficiaries.
What is Matthew Walter, MD's Medicare quality score? ▼
Matthew Walter, 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 Matthew Walter, MD located? ▼
Matthew Walter, MD is located at 4500 FOREST PARK AVE, Saint Louis, MO, 63108. Phone: (314) 454-8304.
What is Matthew Walter, MD's NPI number? ▼
Matthew Walter, MD's National Provider Identifier (NPI) is 1750309472, issued on 07/18/2006.
Does Matthew Walter, MD prescribe more brand-name or generic drugs? ▼
Matthew Walter, MD's prescribing is 26% brand-name and 74% generic drugs by claim count, with $416K in brand drug costs.
How many Hematology (Internal Medicine) Physician providers are there in the US? ▼
There are 1,436 Hematology (Internal Medicine) Physician providers across 50 states in the US. The average Hematology (Internal Medicine) Physician provider writes 693 Medicare Part D claims per year.
What drugs does Matthew Walter, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Matthew Walter, MD's most frequently prescribed drugs include Acyclovir, Escitalopram Oxalate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Matthew Walter, MD accept Medicare? ▼
Matthew Walter, MD appears in CMS Medicare data with 109 Part D claims and 15 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Matthew Walter, MD's credentials? ▼
Matthew Walter, MD's NPI is 1750309472 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.