Derek Shek, M.D.
NPI 1154448587 · Internal Medicine Physician · San Leandro, CA
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Derek Shek, M.D. is a Internal Medicine Physician provider in San Leandro, CA (NPI 1154448587).
Provider details
- NPI number
- 1154448587
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A95144 (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 · 45 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 555 | 106 |
| Abiraterone Acetate | 531 | 78 |
| Osimertinib Mesylatebrand: Tagrisso | 198 | 23 |
| Dexamethasone | 167 | 56 |
| Enzalutamidebrand: Xtandi | 96 | 18 |
| Olanzapine | 86 | 50 |
| Anastrozole | 76 | 26 |
| Ondansetron |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-22
- Last updated
- 2022-02-11
Frequently asked questions
- What is Derek Shek's NPI number?
- Derek Shek's National Provider Identifier (NPI) is 1154448587, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Derek Shek's specialty?
- Derek Shek is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Derek Shek located?
- Derek Shek's practice location on file with NPPES is 2500 Merced Street, San Leandro, CA 94577.
- What is Derek Shek's phone number?
- The practice phone number listed in the NPPES registry for Derek Shek is (510) 454-1000.
- Does Derek Shek accept Medicare?
- Derek Shek is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Derek Shek's NPI active?
- Yes — Derek Shek's NPI (1154448587) is active in the NPPES registry as of the last update on 2022-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.