Quick answers
- Which hospitals does Sienmi Du work at?
- Medicare's official clinician data lists Sienmi Du at 1 hospital: Alta Bates Summit Medical Center - Alta Bates Camp…. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sienmi Du see patients?
- Medicare's clinician data lists 2 practice locations, including Santa Cruz, CA and Berkeley, CA. Call before your visit to confirm the address.
- What is Sienmi Du's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Sienmi Du accept Medicare assignment?
- Yes. Medicare's clinician data says Sienmi Du accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Sienmi Du offer telehealth?
- Medicare's clinician data says Sienmi Du offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Sienmi Du?
- (831) 246-8772, as listed in official Medicare / NPI Registry data.
- What is Sienmi Du's NPI number?
- 1447711320. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sienmi Du works
Medicare's Facility Affiliation Data lists Sienmi Du at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Alta Bates Summit Medical Center - Alta Bates Camp…Berkeley, CA · Acute Care Hospital · CCN 050305
Practice locations
Addresses where Sienmi Du is enrolled with Medicare (CMS data updated 2026-10-02).
- 1665 Dominican Way, Suite 224Santa Cruz, CA 95065 (831) 246‑8772
- 2920 Telegraph Ave, Suite 200Berkeley, CA 94705 (510) 444‑0790
Group practices
Medicare enrollment lists Sienmi Du as a member of this group (CMS data updated 2026-10-02).
- UCSF Health Medical Foundation66 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Santa Cruz
Clinicians with the same Medicare primary specialty in Santa Cruz, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2019 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1447711320 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians