John Karwowski, MD
Vascular Surgery Physician · Baltimore, MD
John Karwowski, MD is a vascular surgery physician with a practice address in Baltimore, Maryland, and NPI 1932123882, issued on Jul 26, 2006. Check the license (Maryland D84011, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- John Karwowski
- Credential
- MD
- Primary taxonomy
- Vascular Surgery Physician 2086S0129X
- License numbers
- D84011 MD
ME116901 FL
Self-reported in NPPES; status is on the state search - Practice location
- 22 S Greene St, Baltimore, MD 21201
- Phone
- (410) 328-5840
- Enumerated
- Jul 26, 2006
- Record last updated
- Feb 26, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (410) 328-0717
- Medicare enrollment
- Enrolled (PECOS I20171011000446); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest vascular surgery physician records → All 103 in Maryland → Look up another NPI →
Also registered at 22 S Greene St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Elsadig Abdalla, MDStudent in an Organized Health Care Education/Training Program1073364477
- Ehssan AbdolalizadehStudent in an Organized Health Care Education/Training Program1093653271
- Mohammad Abdulelah, MDStudent in an Organized Health Care Education/Training Program1114650108
- Leenah AbdulgaderStudent in an Organized Health Care Education/Training Program1386323301
- Ifedayo Abiola-Matthew, CRNPAcute Care Nurse Practitioner1033781117
Verify John Karwowski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D84011Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average vascular surgery physician in 2024
17 Medicare Part D claims, against an average of 201 among the 3,936 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $105.03
2 payments; by number, the most common kind was food and beverage; the largest payer was Boston Scientific Corporation. The 4,059 providers of this specialty with any payment received $6,178.00 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- University OF Maryland Surgical Associates PABaltimore, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Karwowski among 103 vascular surgery physician records in Maryland
John Karwowski, MD is one of 103 vascular surgery physician records with a practice address in Maryland. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 49% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1995 · median 2001 among the 79 with a school on file
- Record last updated2020 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2086S0129X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Vascular Surgery Physician providers in Maryland
There are 103 vascular surgery physician records in Maryland.
All 103 in Maryland → Every provider in Baltimore → Vascular Surgery Physician nationwide →
The 8 vascular surgery physician records with the nearest ZIP codes
- Sarasijhaa Desikan, M.D.Baltimore, MD 212011528402252
- Alison FlentjeBaltimore, MD 212011407219397
- David Gitlitz, MDBaltimore, MD 212011174605323
- Saurabh GuptaBaltimore, MD 212011770934788
- Joel Harding, DOBaltimore, MD 212011457887325
- Rishi Kundi, M.D.Baltimore, MD 212011174740559
- Brajesh Lal, M.D.Baltimore, MD 212011881625564
- Michael Lilly, MDBaltimore, MD 212011700887916
Common questions
What is John Karwowski, MD's NPI number?
John Karwowski, MD's National Provider Identifier (NPI) is 1932123882, issued on Jul 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Karwowski, MD located?
The NPPES record lists a practice address at 22 S Greene St, Baltimore, MD, 21201. Phone: (410) 328-5840. Providers update this record themselves, so call before visiting.
How can I verify John Karwowski, MD's license?
NPPES lists Maryland license number D84011, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Karwowski, MD prescribe under Medicare Part D?
In 2024, John Karwowski, MD had 17 Medicare Part D claims; the average among vascular surgery physician prescribers was 201. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.