Benjamin Mazer, M.D.
NPI 1689022352 · Anatomic Pathology & Clinical Pathology Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Benjamin Mazer, M.D. is a Anatomic Pathology & Clinical Pathology Physician provider in Baltimore, MD (NPI 1689022352).
Provider details
- NPI number
- 1689022352
- Entity type
- Individual
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D88601 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
2,358 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 1,323 | $37 |
| Special Stained Specimen Slides to Examine Tissue, Each Additional Procedure88341 | 239 | $28 |
| Special Stained Specimen Slides to Examine Tissue, Initial Procedure88342 | 228 | $34 |
| Pathology Examination of Tissue Using a Microscope, Moderately High Complexity88307 | 132 | $81 |
| Pathology Examination of Tissue Using a Microscope, Moderately Low Complexity88304 | 87 | $11 |
| Special Stained Specimen Slides to Examine Tissue Including Interpretation and Report88313 | 86 | $12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-06-02
- Last updated
- 2021-04-14
- Certified
- 2021-04-14
Frequently asked questions
- What is Benjamin Mazer's NPI number?
- Benjamin Mazer's National Provider Identifier (NPI) is 1689022352, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Benjamin Mazer's specialty?
- Benjamin Mazer is listed in the NPPES registry with a primary specialty of Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is Benjamin Mazer located?
- Benjamin Mazer's practice location on file with NPPES is 600 N Wolfe St, Baltimore, MD 21287-0005.
- What is Benjamin Mazer's phone number?
- The practice phone number listed in the NPPES registry for Benjamin Mazer is (410) 955-3580.
- Does Benjamin Mazer accept Medicare?
- Benjamin Mazer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Benjamin Mazer's NPI active?
- Yes — Benjamin Mazer's NPI (1689022352) is active in the NPPES registry as of the last update on 2021-04-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.