Dr. Benjamin Louis Mazer, M.D.
Dr. Benjamin Louis Mazer is a Anatomic Pathology & Clinical Pathology Physician provider (Pathology) practicing in Baltimore, MD, registered in the NPPES registry with NPI 1689022352 since 2016. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1689022352 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Benjamin Louis Mazer |
| Credential | M.D. |
| Sex | Male |
| Practice address | 600 N WOLFE ST, Baltimore, MD, 21287 |
| Phone | 4109553580 |
| Fax | 4105500075 |
| Enumeration date | 2016-06-02 |
| Last updated in NPPES | 2021-04-14 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 207ZP0102X | Anatomic Pathology & Clinical Pathology Physician | Primary | D88601 | MD |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Copy-ready billing details
Provider: Benjamin Mazer, M.D. NPI: 1689022352 Taxonomy: 207ZP0102X (Anatomic Pathology & Clinical Pathology Physician) Address: 600 N WOLFE ST, Baltimore, MD, 21287
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1457354821 | Earl Craven | Individual | Ophthalmology Physician | Baltimore, MD |
| 1588667943 | Laura Hostovich | Individual | Nurse Practitioner | Baltimore, MD |
| 1801891080 | Johns Hopkins University | Organization | Cardiovascular Disease Physician | Baltimore, MD |
| 1356346100 | Johns Hopkins University | Organization | Neurology Physician | Baltimore, MD |
| 1013913789 | Johns Hopkins University | Organization | Orthopaedic Surgery Physician | Baltimore, MD |
| 1922004696 | Johns Hopkins University | Organization | Otolaryngology Physician | Baltimore, MD |
| 1740286418 | Johns Hopkins University | Organization | Anesthesiology Physician | Baltimore, MD |
| 1659377323 | Johns Hopkins University | Organization | Dermatology Physician | Baltimore, MD |
Verify this record
Cross-check NPI 1689022352 against the authoritative CMS record: view Dr. Benjamin Louis Mazer on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2021-04-14.