EUGENE C SANTILLANO MD
NPI 1619967007
Family Medicine - Addiction Medicine in Sunnyvale, CA
About Eugene C Santillano Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
EUGENE C SANTILLANO MD (NPI 1619967007) is an individual addiction medicine provider in Sunnyvale, California, licensed in California (A88670) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS, maintains a secondary practice location in Watsonville, and is a graduate of Drexel University College Of Medicine (2003).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Eugene C Santillano Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Eugene Santillano reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Santa Cruz, CA 95060
- Reassigned Medicare billing, California enrollment
- 10 clinicians in this Medicare group
Bakersfield, CA 93312
- Reassigned Medicare billing, California enrollment
- 225 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94089 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 5
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SUNNYVALE, CA 94089
SUNNYVALE, CA 94089
SUNNYVALE, CA 94089
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Eugene Santillano's NPI number?
The NPI number for Eugene Santillano is 1619967007. It was assigned to this individual provider in the NPPES registry on October 26, 2005.
Where is Eugene Santillano located?
Eugene Santillano practices at 1287 Hammerwood Ave, Sunnyvale, CA 94089. The listed phone number is (408) 337-6383.
What is Eugene Santillano's specialty?
The primary specialty registered for this NPI is Family Medicine, specializing in Addiction Medicine, with taxonomy code 207QA0401X.
Is Eugene Santillano enrolled in Medicare?
Yes. Eugene Santillano is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Eugene Santillano's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Eugene Santillano reassigns Medicare benefits to 2 organizations: Medxcare Health Professionals (Santa Cruz, CA) and Emergency Physicians Urgent Care Inc. (Bakersfield, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Eugene Santillano's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Eugene Santillano was last updated on October 24, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Eugene C Santillano, MD · NPI 1619967007
Addiction Medicine physician in Sunnyvale, California. Individual provider, active in the CMS NPPES registry since October 26, 2005.
## Identity
- **NPI:** 1619967007 (Entity type: Individual)
- **Enumerated:** October 26, 2005
- **Primary specialty:** Family Medicine - Addiction Medicine · taxonomy 207QA0401X
- **State license:** A88670 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1287 HAMMERWOOD AVE, Sunnyvale, CA 94089-2231
- **Phone:** (408) 337-6383
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Medxcare Health Professionals (NPI 1982177150, Santa Cruz, CA); Emergency Physicians Urgent Care Inc. (NPI 1689963845, Bakersfield, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Drexel University College Of Medicine, class of 2003
## Record status
- **NPPES last updated:** October 24, 2025
- **Other identifiers:** Medicaid 101722200 (PA)
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Source: [NPI Profile](https://npiprofile.com/npi/1619967007) · Data from the CMS NPPES public registry.