Dr. Brian Michael Karaszewski, MD
- Medicare services, 2024
- 528
- Medicare patients, 2024
- 194
- Part D claims, 2024
- 12,640
- Hospital affiliations
- 4
- Industry payments
- $38,614
- Practice address
- 400 International Dr, Buffalo, NY 14221
- Practice phone
- Call (716) 631-3555
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Dia Invision Health
Buffalo, New York
Find Dr. Karaszewski'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. Brian Michael Karaszewski is an internist in Buffalo, New York
Dr. Karaszewski practices at Dia Invision Health in Buffalo, New York.
Dr. Karaszewski's NPI, 1255478376, was assigned on January 30, 2007. Dr. Karaszewski graduated from University at Buffalo School of Medicine in 1997. Dr. Karaszewski holds New York license 213340-1.
- NPI
- 1255478376NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2264434893
- NPI enumeration date
- January 30, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (716) 631-3555
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 55
- Medical school graduation
- 1997
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Brian Michael Karaszewski practices at Dia Invision Health in Buffalo, New York
Dr. Karaszewski's primary practice is Dia Invision Health, at 400 International Dr, Buffalo, NY 14221 in Erie County. The practice phone is (716) 631-3555.
- Dia Invision Health400 International Dr, Buffalo, NY 14221 · Erie CountyPhone(716) 631-3555
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Brian Michael Karaszewski is affiliated with 7 sites of care and 1 medical group
Dr. Karaszewski's primary practice is Dia Invision Health in Buffalo, New York. Dr. Karaszewski is also affiliated with Buffalo General Medical Center/Gates Vascular Institute. The medical group on file is Invision Health. Dmand AI also links Dr. Karaszewski to 3 more hospitals, 1 group practice or clinic and 1 home health agency, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Brian Michael Karaszewski's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Karaszewski practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dia Invision Health | Available with a free account |
| +6 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Brian Michael Karaszewski is one of 9,643 internists in New York
Internal medicine is Dr. Karaszewski's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Karaszewski is licensed in New York.
Specialties and state licenses
- Internal medicine, New YorkPrimary
Internists near Dr. Karaszewski
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. Brian Michael Karaszewski billed Medicare for 528 services in 2024
CMS data shows 528 Medicare services from Dr. Karaszewski across 5 procedure codes in 2024, for 194 Medicare patients. Medicare paid $31,231 for them. Every service was in an office.
Dr. Karaszewski's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3382024: 3658%
- Other services
- 2023: 1232024: 14215%
- Tests and treatments
- 2023: 262024: 2119%
Dr. Karaszewski compared with the New York median for internists, 2024
- Dr. Karaszewski
- New York median
- Medicare services
- 528vs 42624% above
- Medicare patients
- 194vs 15823% above
- Part D claims
- 11,860vs 62219.1 times
Medians across 9,428 internists in New York with Dmand AI profiles that report each measure.
Dr. Karaszewski'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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Karaszewski and other internists in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Brian Michael Karaszewski treated 194 Medicare patients in 2024, average age 75
CMS counts 194 Medicare patients who saw Dr. Karaszewski in 2024. The largest group is 65 to 74, with 75 patients. 75% of them have high cholesterol, and 74% have high blood pressure. 10% are also on Medicaid. Their average risk score is 1.01, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Karaszewski's median patient age at 70, with 54% women.
Dr. Karaszewski's Medicare patients by age, 2024
Dr. Karaszewski's Medicare patients by sex, 2024
- Women9951%
- Men9549%
Chronic conditions among Dr. Karaszewski's Medicare patients, 2024
- High cholesterol75%
- High blood pressure74%
- Arthritis46%
- Diabetes30%
- Ischemic heart disease29%
- Anxiety19%
- Atrial fibrillation16%
- Cancer16%
Share of Medicare patients with each condition. A patient can have several.
Dr. Karaszewski's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Brian Michael Karaszewski wrote 12,640 Medicare Part D claims in 2024
In 2024, Dr. Karaszewski wrote 12,640 Medicare Part D claims for 1,086 patients. 85% of them were for generic drugs. CMS names the drug for 11,860 of them, across 172 drugs with 11 or more claims each, at $1,026,870 in total drug cost. In 2023, CMS named 12,342 claims across 184 drugs.
Dr. Karaszewski's Part D claims by kind of drug, 2024
- Generic10,804 claims85%
- Brand-name1,699 claims13%
- Other137 claims1%
Dr. Karaszewski'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. Karaszewski's Part D claims, 2024
- Opioids2%207 of 12,640 claims
- Antibiotics2%314 of 12,640 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: 12,3422024: 11,8604%
Drugs named by CMS: 172 in 2024, 184 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
How Dr. Brian Michael Karaszewski takes part in Medicare
Dr. Karaszewski accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Brian Michael Karaszewski received $38,614 in industry payments from 2016 to 2025
CMS Open Payments shows 2,644 general payments to Dr. Karaszewski from 82 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Boehringer Ingelheim Pharmaceuticals, Inc. paid the most, $4,132.
General payments to Dr. Karaszewski by program year, 2016 to 2025
General payments to Dr. Karaszewski by kind, 2016 to 2025
- Food and beverage$38,26199%
- Education$3531%
Companies that paid Dr. Karaszewski 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. Brian Michael Karaszewski graduated from University at Buffalo School of Medicine
Dr. Karaszewski graduated from University at Buffalo School of Medicine in 1997.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Brian Michael Karaszewski'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 Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (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. Brian Michael Karaszewski
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. Brian Michael Karaszewski's NPI number?
Dr. Brian Michael Karaszewski's NPI number is 1255478376. It was assigned on January 30, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Brian Michael Karaszewski?
Dr. Brian Michael Karaszewski is an internist in Buffalo, New York. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Brian Michael Karaszewski practice?
Dr. Karaszewski practices at 400 International Dr, Buffalo, NY 14221. Dr. Karaszewski's primary practice is Dia Invision Health in Buffalo, New York. Dmand AI also links Dr. Karaszewski to 3 hospitals, 1 group practice or clinic and 1 home health agency.
What is Dr. Brian Michael Karaszewski's office phone number?
The practice phone on file for Dr. Karaszewski is (716) 631-3555.
What is Dr. Brian Michael Karaszewski's medical license number?
Dr. Karaszewski holds New York license 213340-1.
Which hospitals is Dr. Brian Michael Karaszewski affiliated with?
Dr. Karaszewski is affiliated with Buffalo General Medical Center/Gates Vascular Institute. Dmand AI links Dr. Karaszewski to 3 more hospitals.
What medical group is Dr. Brian Michael Karaszewski part of?
Dr. Karaszewski is linked to Invision Health.
Does Dr. Brian Michael Karaszewski accept Medicare?
Yes. CMS data shows Dr. Karaszewski billed Medicare for 528 services in 2024, and Dr. Karaszewski accepts Medicare assignment.
How many Medicare patients does Dr. Brian Michael Karaszewski see?
CMS counts 194 Medicare patients who saw Dr. Karaszewski in 2024, with an average age of 75.
What services does Dr. Brian Michael Karaszewski bill to Medicare?
In 2024, Dr. Karaszewski's most billed Medicare services were care management and other visits (99457), medicare service (G0439) and care management and other visits (99454).
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Where did Dr. Brian Michael Karaszewski go to medical school?
Dr. Karaszewski graduated from University at Buffalo School of Medicine in 1997.
What drugs does Dr. Brian Michael Karaszewski prescribe most?
In 2024 Medicare Part D data, Dr. Karaszewski's most prescribed drugs by claims were Levothyroxine Sodium, Amlodipine Besylate and Rosuvastatin Calcium.
Has Dr. Brian Michael Karaszewski received payments from drug or device companies?
CMS Open Payments shows $38,614 in general payments to Dr. Karaszewski from 82 companies from 2016 to 2025. The largest total came from Boehringer Ingelheim Pharmaceuticals, Inc.
How long has Dr. Brian Michael Karaszewski been practicing?
Dr. Karaszewski graduated from medical school in 1997, 29 years ago.
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