Peter Mazonson, MD
NPI 1811953391 · Internal Medicine Physician · San Jose, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Peter Mazonson, MD is a Internal Medicine Physician provider in San Jose, CA (NPI 1811953391).
Provider details
- NPI number
- 1811953391
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- G61502 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metformin Hcl | 44 | 11 |
| Atorvastatin Calcium | 42 | 11 |
| Omeprazole | 38 | — |
| Simvastatin | 31 | — |
| Fluoxetine Hcl | 25 | — |
| Semaglutidebrand: Ozempic | 23 | — |
| Atenolol | 21 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-25
- Last updated
- 2007-07-08
Frequently asked questions
- What is Peter Mazonson's NPI number?
- Peter Mazonson's National Provider Identifier (NPI) is 1811953391, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Peter Mazonson's specialty?
- Peter Mazonson is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Peter Mazonson located?
- Peter Mazonson's practice location on file with NPPES is 500 Tully Rd, San Jose, CA 95111-1917.
- What is Peter Mazonson's phone number?
- The practice phone number listed in the NPPES registry for Peter Mazonson is (408) 494-7400.
- Does Peter Mazonson accept Medicare?
- Peter Mazonson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Peter Mazonson's NPI active?
- Yes — Peter Mazonson's NPI (1811953391) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.