Quick answers
- Does Maria C. Quan accept Medicare assignment?
- Yes. Medicare's clinician data says Maria C. Quan 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 C. Quan's NPI number?
- 1043281405. 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 C. Quan works
Medicare's Facility Affiliation Data lists Maria C. Quan 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.
- Stanford Health Care Tri-ValleyPleasanton, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050283
Practice locations
Addresses where Maria C. Quan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1000 Vale Terrace DrVista, CA 92084 (760) 631‑5000
- 20642 John DrCastro Valley, CA 94546 (888) 924‑1036
Group practices
Medicare enrollment lists Maria C. Quan as a member of these groups (CMS data updated October 2, 2026).
- University Healthcare Alliance327 clinicians in the group
- Vista Community Clinic44 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Vista
Clinicians with the same Medicare primary specialty in Vista, CA — not a recommendation.
Other clinicians in University Healthcare Alliance
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1989 (37 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1043281405 |
| 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