Stephen Vaccarezza, M.D.
Nephrology Physician · Rockville, MD
Stephen Vaccarezza, M.D. is a nephrology physician with a practice address in Rockville, Maryland, and NPI 1861488314, issued on Sep 21, 2005. Check the license (Maryland D35103, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Stephen Vaccarezza
- Credential
- M.D.
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- D35103 MD
Self-reported in NPPES; status is on the state search - Practice location
- 6240 Montrose RD, Rockville, MD 20852
- Phone
- (301) 231-7111
- Enumerated
- Sep 21, 2005
- Record last updated
- Oct 31, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (301) 231-9040
- Medicaid ID
- 282111700 MD
- Medicare enrollment
- Enrolled (PECOS I20090529000109); accepts Medicare assignment
- Medical or professional school
- University Of Chicago, Pritzker School Of Medicine, 1981
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 337 in Maryland → Look up another NPI →
Also registered at 6240 Montrose RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Stephen Hellman, M.D.Nephrology Physician1942296926
- Jeffrey Perlmutter, M.D.Nephrology Physician1588651889
Verify Stephen Vaccarezza in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D35103Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% fewer Medicare Part D claims than the average nephrology physician in 2024
1,445 Medicare Part D claims for 178 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Calcium Acetate85 claims
- Amlodipine Besylate83 claims
- Carvedilol64 claims
- Furosemide61 claims
- Losartan Potassium58 claims
- Lisinopril52 claims
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: $908.95
42 payments; by number, the most common kind was food and beverage; the largest payer was Ardelyx, Inc. The 8,230 providers of this specialty with any payment received $3,091.37 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
- Nephrology Associates OF Montgomery CountyRockville, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen Vaccarezza among 337 nephrology physician records in Maryland
Stephen Vaccarezza, M.D. is one of 337 nephrology physician records with a practice address in Maryland. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 85% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1981 · median 2001 among the 232 with a school on file
- Record last updated2011 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in Maryland
There are 337 nephrology physician records in Maryland.
All 337 in Maryland → Every provider in Rockville → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Stephen Hellman, M.D.Rockville, MD 208521942296926
- Margarita Kullick, MDRockville, MD 208521114999497
- Jeffrey Perlmutter, M.D.Rockville, MD 208521588651889
- Philip Schwartz, M.D.Rockville, MD 208521750389128
- Oney Zuniga, MDRockville, MD 208521689658627
- Mario Belledonne, M.D.Potomac, MD 208541033129457
- Vikram Doraiswamy, M.D.Rockville, MD 208541427468487
- Susan Ginsberg, MDRockville, MD 208541912974478
Common questions
What is Stephen Vaccarezza, M.D.'s NPI number?
Stephen Vaccarezza, M.D.'s National Provider Identifier (NPI) is 1861488314, issued on Sep 21, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Vaccarezza, M.D. located?
The NPPES record lists a practice address at 6240 Montrose RD, Rockville, MD, 20852. Phone: (301) 231-7111. Providers update this record themselves, so call before visiting.
How can I verify Stephen Vaccarezza, M.D.'s license?
NPPES lists Maryland license number D35103, 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 Stephen Vaccarezza, M.D. prescribe under Medicare Part D?
In 2024, Stephen Vaccarezza, M.D. had 1,445 Medicare Part D claims for 178 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.