Bonnie Balzer, MD
NPI 1649247602 · Clinical Pathology/Laboratory Medicine Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Bonnie Balzer, MD is a Clinical Pathology/Laboratory Medicine Physician provider in San Francisco, CA (NPI 1649247602).
Provider details
- NPI number
- 1649247602
- Entity type
- Individual
- Primary specialty
- Clinical Pathology/Laboratory Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A78681 (CA)
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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
4,524 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 | 2,132 | $80 |
| Special Stained Specimen Slides to Examine Tissue, Each Additional Procedure88341 | 415 | $29 |
| Special Stained Specimen Slides to Examine Tissue, Each Additional Procedure88341 | 395 | $104 |
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 273 | $39 |
| Special Stained Specimen Slides to Examine Tissue, Initial Procedure88342 | 150 | $121 |
| Pathology Examination of Tissue Using a Microscope, Moderately High Complexity88307 | 130 | $85 |
Practice location
Mailing address
Additional practice locations (1)
- 4301 Northstar WayModesto, CA 95356-9262Phone: (209) 577-1200Fax: (209) 577-6517
Registry dates
- Enumerated
- 2006-03-08
- Last updated
- 2020-06-17
- Certified
- 2020-06-17
Frequently asked questions
- What is Bonnie Balzer's NPI number?
- Bonnie Balzer's National Provider Identifier (NPI) is 1649247602, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Bonnie Balzer's specialty?
- Bonnie Balzer is listed in the NPPES registry with a primary specialty of Clinical Pathology/Laboratory Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Bonnie Balzer located?
- Bonnie Balzer's practice location on file with NPPES is 3700 California St, San Francisco, CA 94118.
- What is Bonnie Balzer's phone number?
- The practice phone number listed in the NPPES registry for Bonnie Balzer is (415) 750-6095.
- Does Bonnie Balzer accept Medicare?
- Bonnie Balzer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Bonnie Balzer's NPI active?
- Yes — Bonnie Balzer's NPI (1649247602) is active in the NPPES registry as of the last update on 2020-06-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.