Dr. Stanley G. Vriezelaar, MD
- Medicare services, 2024
- 1,726
- Medicare patients, 2024
- 230
- Part D claims, 2024
- 13,828
- Hospital affiliations
- 3
- Industry payments
- $2,896
- Practice address
- One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110
- Practice phone
- Call (314) 747-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Vriezelaar's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Stanley G. Vriezelaar is an internist in Saint Louis, Missouri
Dr. Vriezelaar practices at Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health.
Dr. Vriezelaar's NPI, 1649252552, was assigned on November 16, 2005. Dr. Vriezelaar graduated from University of Iowa, RJ & L Carver College of Medicine in 1981. Dr. Vriezelaar holds Missouri license R4D79.
- NPI
- 1649252552NPI Registry (opens in a new tab)
- NPI enumeration date
- November 16, 2005
- NPI status
- Active
- Practice phone
- (314) 747-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 71
- Medical school graduation
- 1981
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Stanley G. Vriezelaar practices at 2 locations in Saint Louis, Missouri
Dr. Vriezelaar's primary practice is Barnes-Jewish Hospital, at One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110 in St. Louis City. The practice phone is (314) 747-3000. Dr. Vriezelaar also practices at Barnes-Jewish Hospital, 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110.
- Barnes-Jewish HospitalPrimaryOne Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110 · St. Louis CityPhone(314) 747-3000
- Barnes-Jewish Hospital1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110 · Saint Louis CityPhone(314) 747-3000
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Stanley G. Vriezelaar is affiliated with 3 sites of care and 1 medical group
Dr. Vriezelaar's primary practice is Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health. Dr. Vriezelaar is also affiliated with SSM Health St. Mary's Hospital - St. Louis. The medical group on file is Esse Health. Dmand AI also links Dr. Vriezelaar to 1 more hospital, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Stanley G. Vriezelaar's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Vriezelaar practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Barnes-Jewish Hospital | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Stanley G. Vriezelaar is one of 2,114 internists in Missouri
Internal medicine is Dr. Vriezelaar's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Vriezelaar is licensed in Missouri.
Specialties and state licenses
- Internal medicine, MissouriPrimary
Internists near Dr. Vriezelaar
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Stanley G. Vriezelaar billed Medicare for 1,726 services in 2024
CMS data shows 1,726 Medicare services from Dr. Vriezelaar across 25 procedure codes in 2024, for 230 Medicare patients. Medicare paid $59,418 for them. Every service was in an office.
Dr. Vriezelaar's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 7122024: 82416%
- Office and hospital visits
- 2023: 3282024: 41226%
- Surgery
- 2023: 2282024: 26717%
- Other services
- 2023: 1192024: 13513%
- Tests and treatments
- 2023: 452024: 8896%
Dr. Vriezelaar compared with the Missouri median for internists, 2024
- Dr. Vriezelaar
- Missouri median
- Medicare services
- 1,726vs 5303.3 times
- Medicare patients
- 230vs 2119% above
- Part D claims
- 12,862vs 32539.6 times
Medians across 2,076 internists in Missouri with Dmand AI profiles that report each measure.
Dr. Vriezelaar's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Vriezelaar?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Vriezelaar and other internists in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Stanley G. Vriezelaar treated 230 Medicare patients in 2024, average age 75
CMS counts 230 Medicare patients who saw Dr. Vriezelaar in 2024. The largest group is 65 to 74, with 116 patients. 75% of them have high blood pressure, and 48% have high cholesterol. Their average risk score is 1.05, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Vriezelaar's median patient age at 73, with 51% women.
Dr. Vriezelaar's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Vriezelaar's Medicare patients by sex, 2024
- Women11249%
- Men11851%
Chronic conditions among Dr. Vriezelaar's Medicare patients, 2024
- High blood pressure75%
- High cholesterol48%
- Diabetes34%
- Arthritis30%
- Chronic kidney disease24%
- Cancer16%
- Mood disorders13%
- Ischemic heart disease12%
Share of Medicare patients with each condition. A patient can have several.
Dr. Vriezelaar's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women51%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Stanley G. Vriezelaar wrote 13,828 Medicare Part D claims in 2024
In 2024, Dr. Vriezelaar wrote 13,828 Medicare Part D claims for 886 patients. 88% of them were for generic drugs. CMS names the drug for 12,862 of them, across 174 drugs with 11 or more claims each, at $861,338 in total drug cost. In 2023, CMS named 11,261 claims across 173 drugs.
Dr. Vriezelaar's Part D claims by kind of drug, 2024
- Generic12,132 claims88%
- Brand-name1,563 claims11%
- Other133 claims1%
Dr. Vriezelaar's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Vriezelaar's Part D claims, 2024
- Opioids3%440 of 13,828 claims
- Antibiotics2%266 of 13,828 claims
- Antipsychotics, patients 65 and over1%87 of 13,828 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 11,2612024: 12,86214%
Drugs named by CMS: 174 in 2024, 173 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Stanley G. Vriezelaar received $2,896 in industry payments from 2016 to 2025
CMS Open Payments shows 177 general payments to Dr. Vriezelaar from 29 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Novo Nordisk Inc paid the most, $484.
General payments to Dr. Vriezelaar by program year, 2016 to 2025
Companies that paid Dr. Vriezelaar the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Stanley G. Vriezelaar graduated from University of Iowa, RJ & L Carver College of Medicine
Dr. Vriezelaar graduated from University of Iowa, RJ & L Carver College of Medicine in 1981.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Stanley G. Vriezelaar's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Stanley G. Vriezelaar
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Stanley G. Vriezelaar's NPI number?
Dr. Stanley G. Vriezelaar's NPI number is 1649252552. It was assigned on November 16, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Stanley G. Vriezelaar?
Dr. Stanley G. Vriezelaar is an internist in Saint Louis, Missouri. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Stanley G. Vriezelaar practice?
Dr. Vriezelaar practices at One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110. Dr. Vriezelaar also practices at 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110. Dr. Vriezelaar's primary practice is Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health. Dmand AI also links Dr. Vriezelaar to 1 hospital.
What is Dr. Stanley G. Vriezelaar's office phone number?
The practice phone on file for Dr. Vriezelaar is (314) 747-3000.
What is Dr. Stanley G. Vriezelaar's medical license number?
Dr. Vriezelaar holds Missouri license R4D79.
Which hospitals is Dr. Stanley G. Vriezelaar affiliated with?
Dr. Vriezelaar practices at Barnes-Jewish Hospital in Saint Louis, Missouri. Dr. Vriezelaar is also affiliated with SSM Health St. Mary's Hospital - St. Louis. Dmand AI links Dr. Vriezelaar to 1 more hospital.
What medical group is Dr. Stanley G. Vriezelaar part of?
Dr. Vriezelaar is linked to Esse Health.
Does Dr. Stanley G. Vriezelaar accept Medicare?
Yes. CMS data shows Dr. Vriezelaar billed Medicare for 1,726 services in 2024.
How many Medicare patients does Dr. Stanley G. Vriezelaar see?
CMS counts 230 Medicare patients who saw Dr. Vriezelaar in 2024, with an average age of 75.
What services does Dr. Stanley G. Vriezelaar bill to Medicare?
In 2024, Dr. Vriezelaar's most billed Medicare services were office visit, established patient (99214), surgery: heart and blood vessels (36415) and lab and pathology test (80053).
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Where did Dr. Stanley G. Vriezelaar go to medical school?
Dr. Vriezelaar graduated from University of Iowa, RJ & L Carver College of Medicine in 1981.
What drugs does Dr. Stanley G. Vriezelaar prescribe most?
In 2024 Medicare Part D data, Dr. Vriezelaar's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Metformin HCl.
Has Dr. Stanley G. Vriezelaar received payments from drug or device companies?
CMS Open Payments shows $2,896 in general payments to Dr. Vriezelaar from 29 companies from 2016 to 2025. The largest total came from Novo Nordisk Inc.
How long has Dr. Stanley G. Vriezelaar been practicing?
Dr. Vriezelaar graduated from medical school in 1981, 45 years ago.
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