Maria C. Quan, MD
NPI 1043281405ActiveIndividual· Obstetrics & Gynecology· San Ramon, CA
Obstetrics & Gynecology (MD) with University Healthcare Alliance and 1 other group, practicing in San Ramon, California. Part D covered 27 prescriptions written in 2024, 67% of them generic. Hologic Sales and Service, LLC was the largest of 2 companies reporting payments in 2025, $66.35 in all, mostly food and beverage. Lists Stanford Health Care Tri-Valley as a hospital affiliation.
Overview
| NPI | 1043281405 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Feb 1, 2006 |
| Last updated in NPPES | May 18, 2026 |
| Certified by provider | May 18, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Obstetrics & Gynecology Primary | 207V00000X | C143703 | CA |
| Obstetrics & Gynecology | 207V00000X | MD00037841 | WA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Obstetrics/Gynecology (CA) |
|---|
Part D prescriptions in 2024
| Prescriptions (claims) | 27 · 29 30-day fills |
|---|---|
| Total drug cost | $2,364 |
| Generic share | 67% of claims |
Education and affiliations
| Graduation year | 1989 |
|---|---|
| Medicare specialty | Obstetrics/Gynecology |
| Telehealth | Offers telehealth |
Medical groups
- University Healthcare AlliancePleasanton, CA · 327 clinicians
- Vista Community ClinicVista, CA · 44 clinicians
Hospital affiliation
- Stanford Health Care Tri-ValleyPleasanton, CA
Industry payments (Open Payments)
- 2025$66.35 · 3 payments from 2 companies
- 2024$25.71 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Hologic Sales and Service, LLC | $49.75 | 2 |
| Astellas Pharma US Inc | $16.60 | 1 |
What the 2025 payments were for
- Food and Beverage$66.35 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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