Doctor profile · Federal record
Dr. Brian Karaszewski, M.D.
Internal Medicine Physician (CMS: Internal Medicine) · Williamsville, NY
- NPI 1255478376
- Accepts Medicare
- 29 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
400 International Dr.
Williamsville, NY 14221
(716) 631-3555
fax (716) 631-9525
Credentials & registration
- NPI registered
- January 2007 — 19 yrs on file
- Profile last updated
- August 19, 2019
- Year of graduation
- 1997 — 29 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- New York #213340-1
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1255478376. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
487
Distinct HCPCS
8
Medicare allowed
$39,202
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 177 | 125 | $86 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 123 | 123 | $123 | |
99457 |
Management using the results of remote vital sign monitoring per calendar month, first 20 minutes | 86 | 25 | $46 | |
99454 |
Remote monitoring of physiologic parameters, initial supply of devices with daily recordings or programmed alerts transmission, each 30 days | 48 | 17 | $47 | |
99211 |
Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional | 15 | 11 | $22 | |
96132 |
Evaluation of neuropsychological test, first hour | 13 | 13 | $125 | |
96138 |
Administration of psychological or neuropsychological test by technician, first 30 minutes | 13 | 13 | $32 | |
99453 |
Remote monitoring of physiologic parameters, initial set-up and patient education on use of equipment | 12 | 12 | $18 |
In context: peer comparison
Among 18 peers in Williamsville Internal Medicine Physician, average services per provider: 65. This provider delivers 7.5× the peer median.Open Payments
Industry payments received
All-time total
$4,110
Transactions
190
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Abbvie INC. | 40 | $755.13 | |
| AstraZeneca Pharmaceuticals Lp | 6 | $422.11 | |
| Lilly USA, LLC | 26 | $390.41 | |
| GlaxoSmithKline, LLC. | 22 | $371.86 | |
| Amgen INC. | 18 | $344.87 | |
| Boehringer Ingelheim Pharmaceuticals, INC. | 14 | $309.12 | |
| BioCryst US Sales Co., LLC | 11 | $211.07 | |
| Novo Nordisk INC | 11 | $201.04 | |
| Takeda Pharmaceuticals U.S.A., INC. | 20 | $164.51 | |
| Exact Sciences Corporation | 6 | $130.87 | |
| Zoll Services LLC (A/K/A Zoll LifeCor Corp) | 1 | $90.66 | |
| Janssen Biotech, INC. | 4 | $86.73 | |
| Ucb, INC. | 3 | $75.85 | |
| Mylan Specialty L.P. | 4 | $61.93 | |
| Astellas Pharma US INC | 4 | $59.73 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
5,246
Patients
1,350
Total drug cost
$101,642
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Levothyroxine Sodium | Generic | 920 | 236 | $21,897 |
| Amlodipine Besylate | Generic | 583 | 136 | $4,905 |
| Rosuvastatin Calcium | Generic | 491 | 141 | $11,385 |
| Atorvastatin Calcium | Generic | 450 | 130 | $8,254 |
| Omeprazole | Generic | 397 | 94 | $4,778 |
| Lisinopril | Generic | 395 | 101 | $4,652 |
| Metoprolol Succinate | Generic | 331 | 82 | $8,775 |
| Pantoprazole Sodium | Generic | 309 | 85 | $6,757 |
| Furosemide | Generic | 227 | 63 | $1,661 |
| Metformin Hcl | Generic | 216 | 60 | $3,267 |
Hospital affiliations
Frequently asked questions
What is Dr. Brian Karaszewski's medical specialty?
Dr. Brian Karaszewski practices Internal Medicine Physician in Williamsville, NY.
Where does Dr. Brian Karaszewski practice?
Dr. Brian Karaszewski practices at 400 International Dr., Williamsville, NY 14221. Office phone: 7166313555.
What is Dr. Brian Karaszewski's NPI?
Dr. Brian Karaszewski's National Provider Identifier (NPI) is 1255478376, issued by NPPES.
Does Dr. Brian Karaszewski accept Medicare assignment?
Yes. Dr. Brian Karaszewski accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Brian Karaszewski commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (HCPCS G0439); Management using the results of remote vital sign monitoring per calendar month (HCPCS 99457). Source: CMS Medicare Physician & Other Practitioners file.