Eugene Santillano, MD
NPI 1619967007 · Addiction Medicine (Family Medicine) Physician · Sunnyvale, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Eugene Santillano, MD is a Addiction Medicine (Family Medicine) Physician provider in Sunnyvale, CA (NPI 1619967007).
Provider details
- NPI number
- 1619967007
- Entity type
- Individual
- Primary specialty
- Addiction Medicine (Family Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A88670 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
2 documented practice locations
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 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 29 | 14 |
| Metformin Hcl | 14 | — |
| Duloxetine Hcl | 13 | — |
| Lisinopril | 13 | — |
| Amlodipine Besylate | 12 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 50 Penny LnWatsonville, CA 95076-3079Phone: (831) 425-9500
Registry dates
- Enumerated
- 2005-10-26
- Last updated
- 2025-10-24
- Certified
- 2025-10-24
Frequently asked questions
- What is Eugene Santillano's NPI number?
- Eugene Santillano's National Provider Identifier (NPI) is 1619967007, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Eugene Santillano's specialty?
- Eugene Santillano is listed in the NPPES registry with a primary specialty of Addiction Medicine (Family Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Eugene Santillano located?
- Eugene Santillano's practice location on file with NPPES is 1287 Hammerwood Ave, Sunnyvale, CA 94089-2231.
- What is Eugene Santillano's phone number?
- The practice phone number listed in the NPPES registry for Eugene Santillano is (408) 337-6383.
- Does Eugene Santillano accept Medicare?
- Eugene Santillano is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Eugene Santillano's NPI active?
- Yes — Eugene Santillano's NPI (1619967007) is active in the NPPES registry as of the last update on 2025-10-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.