Benjamin Louis Mazer, M.D.
Anatomic Pathology & Clinical Pathology Physician · Baltimore, MD
Benjamin Louis Mazer, M.D. is an anatomic pathology & clinical pathology physician with a practice address in Baltimore, Maryland, and NPI 1689022352, issued on Jun 2, 2016. Check the license (Maryland D88601, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Benjamin Louis Mazer
- Credential
- M.D.
- Primary taxonomy
- Anatomic Pathology & Clinical Pathology Physician 207ZP0102X
- License number
- D88601 MD
Self-reported in NPPES; status is on the state search - Practice location
- 600 N Wolfe St, Baltimore, MD 21287
- Phone
- (410) 955-3580
- Enumerated
- Jun 2, 2016
- Record last updated
- Apr 14, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (410) 550-0075
- Medicare enrollment
- Enrolled (PECOS I20200629000012); may accept Medicare assignment
- Medical or professional school
- University Of Rochester School Of Medicine And Dentistry, 2016
- Entity
- Type 1 · individual
8 nearest anatomic pathology & clinical pathology physician records → All 357 in Maryland → Look up another NPI →
Also registered at 600 N Wolfe St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Abdulrahman Abodarahim, MBBCHOphthalmology Physician1770182560
- Aida Abou-ZamzamStudent in an Organized Health Care Education/Training Program1891456034
- Mya AbousyStudent in an Organized Health Care Education/Training Program1700422169
- Christopher Abularrage, MDVascular Surgery Physician1063675908
- Sahaja Acharya, M.D.Radiation Oncology Physician1639436603
- Stephen Achuff, M.D.Cardiovascular Disease Physician1326001033
Verify Benjamin Louis Mazer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D88601Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 74.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 2 group practices
- Johns Hopkins UniversityBaltimore, MD
- Johns Hopkins UniversityMiddle River, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Benjamin Louis Mazer among 357 anatomic pathology & clinical pathology physician records in Maryland
Benjamin Louis Mazer, M.D. is one of 357 anatomic pathology & clinical pathology physician records with a practice address in Maryland. 59% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 82% of them.
- NPI issued2016 · 82% of these records are older, 14% newer
- In a Medicare fileYes · 59% of these records are
- In the CMS Doctors and Clinicians fileYes · 54% of these records are
- Graduated2016 · median 2003 among the 191 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207ZP0102X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Anatomic Pathology & Clinical Pathology Physician providers in Maryland
There are 357 anatomic pathology & clinical pathology physician records in Maryland.
All 357 in Maryland → Every provider in Baltimore → Anatomic Pathology & Clinical Pathology Physician nationwide →
The 8 anatomic pathology & clinical pathology physician records with the nearest ZIP codes
- Robert Anders, M.D.Baltimore, MD 212871841254737
- Pedram Argani, M.D.Baltimore, MD 212871972567782
- Frederic Askin, M.D.Baltimore, MD 212871649235474
- William Baldwin, M.D.Baltimore, MD 212871053376129
- David Berman, M.D.Baltimore, MD 212871487610754
- John Boitnott, M.D.Baltimore, MD 212871952367658
- Michael Borowitz, M.D.Baltimore, MD 212871689630733
- Peter Burger, M.D.Baltimore, MD 212871114985603
Common questions
What is Benjamin Louis Mazer, M.D.'s NPI number?
Benjamin Louis Mazer, M.D.'s National Provider Identifier (NPI) is 1689022352, issued on Jun 2, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Benjamin Louis Mazer, M.D. located?
The NPPES record lists a practice address at 600 N Wolfe St, Baltimore, MD, 21287. Phone: (410) 955-3580. Providers update this record themselves, so call before visiting.
How can I verify Benjamin Louis Mazer, M.D.'s license?
NPPES lists Maryland license number D88601, 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.
What is Benjamin Louis Mazer, M.D.'s MIPS final score?
The 2023 MIPS final score is 74.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.