Derrick Siao, M.D.
NPI 1073849261 · Gastroenterology Physician · Santa Clara, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Derrick Siao, M.D. is a Gastroenterology Physician provider in Santa Clara, CA (NPI 1073849261).
Provider details
- NPI number
- 1073849261
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A110506 (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
16 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 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 242 | 237 |
| Pantoprazole Sodium | 128 | 47 |
| Budesonidebrand: Budesonide Dr | 72 | 17 |
| Lubiprostone | 53 | 14 |
| Mesalamine | 51 | 11 |
| Cholestyramine (with Sugar)brand: Cholestyramine | 31 | 13 |
| Plecanatidebrand: Trulance | 27 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-10-23
- Last updated
- 2022-02-11
Frequently asked questions
- What is Derrick Siao's NPI number?
- Derrick Siao's National Provider Identifier (NPI) is 1073849261, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Derrick Siao's specialty?
- Derrick Siao is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Derrick Siao located?
- Derrick Siao's practice location on file with NPPES is 710 Lawrence Expy, Santa Clara, CA 95051-5173.
- What is Derrick Siao's phone number?
- The practice phone number listed in the NPPES registry for Derrick Siao is (408) 851-2750.
- Does Derrick Siao accept Medicare?
- Derrick Siao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Derrick Siao's NPI active?
- Yes — Derrick Siao's NPI (1073849261) 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.