Quick answers
- Does Maria Kristina A. Sia accept Medicare assignment?
- Yes. Medicare's clinician data says Maria Kristina A. Sia accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Maria Kristina A. Sia's NPI number?
- 1043064975. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Maria Kristina A. Sia works
Medicare's Facility Affiliation Data lists Maria Kristina A. Sia at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Peninsula Medical CenterBurlingame, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050007
Practice locations
Addresses where Maria Kristina A. Sia is enrolled with Medicare (CMS data updated October 2, 2026).
- 1241 E Hillsdale Blvd, Suite 270Foster City, CA 94404 (650) 918‑5080
Group practices
Medicare enrollment lists Maria Kristina A. Sia as a member of this group (CMS data updated October 2, 2026).
- Foster City Medical Center4 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Foster City Medical Center
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2017 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1043064975 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- 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