Mark Shimazaki, DO
NPI 1275611717 · Geriatric Medicine (Internal Medicine) Physician · Santa Clara, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Shimazaki, DO is a Geriatric Medicine (Internal Medicine) Physician provider in Santa Clara, CA (NPI 1275611717).
Provider details
- NPI number
- 1275611717
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 20A8584 (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
19 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 · 102 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 422 | 147 |
| Amlodipine Besylate | 265 | 88 |
| Losartan Potassium | 197 | 64 |
| Levothyroxine Sodium | 192 | 53 |
| Tamsulosin Hcl | 152 | 63 |
| Lisinopril | 150 | 50 |
| Simvastatin | 118 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2021-12-09
Frequently asked questions
- What is Mark Shimazaki's NPI number?
- Mark Shimazaki's National Provider Identifier (NPI) is 1275611717, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Shimazaki's specialty?
- Mark Shimazaki is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Shimazaki located?
- Mark Shimazaki's practice location on file with NPPES is 710 Lawrence Expy, Santa Clara, CA 95051-5173.
- What is Mark Shimazaki's phone number?
- The practice phone number listed in the NPPES registry for Mark Shimazaki is (408) 851-1000.
- Does Mark Shimazaki accept Medicare?
- Mark Shimazaki is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Shimazaki's NPI active?
- Yes — Mark Shimazaki's NPI (1275611717) is active in the NPPES registry as of the last update on 2021-12-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.