Stanley Vriezelaar, M.D.
NPI 1649252552 · Internal Medicine Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stanley Vriezelaar, M.D. is a Internal Medicine Physician provider in Saint Louis, MO (NPI 1649252552).
Provider details
- NPI number
- 1649252552
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- R4D79 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,664 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 321 | $122 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 267 | $9 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 150 | $10 |
| Hemoglobin A1c Level83036 | 132 | $9 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 124 | $13 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 102 | $8 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 174 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 922 | 277 |
| Amlodipine Besylate | 672 | 210 |
| Metformin Hcl | 490 | 140 |
| Losartan Potassium | 478 | 149 |
| Lisinopril | 459 | 130 |
| Hydrochlorothiazide | 325 | 103 |
| Omeprazole | 308 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$432 across 23 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-11-16
- Last updated
- 2012-10-01
Frequently asked questions
- What is Stanley Vriezelaar's NPI number?
- Stanley Vriezelaar's National Provider Identifier (NPI) is 1649252552, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stanley Vriezelaar's specialty?
- Stanley Vriezelaar is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stanley Vriezelaar located?
- Stanley Vriezelaar's practice location on file with NPPES is 1027 Bellevue Ave, Saint Louis, MO 63117-1851.
- What is Stanley Vriezelaar's phone number?
- The practice phone number listed in the NPPES registry for Stanley Vriezelaar is (314) 645-3743.
- Does Stanley Vriezelaar accept Medicare?
- Stanley Vriezelaar is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stanley Vriezelaar's NPI active?
- Yes — Stanley Vriezelaar's NPI (1649252552) is active in the NPPES registry as of the last update on 2012-10-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.