MARIA C QUAN MD
NPI 1043281405
Obstetrics & Gynecology in San Ramon, CA
About Maria C Quan Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIA C QUAN MD (NPI 1043281405) is an individual obstetrics & gynecology provider in San Ramon, California, licensed in California (C143703) and active in the NPI registry since February 2006. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (1989).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
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
Maria C Quan 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
4Medicare enrollment records show Maria Quan reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Newark, CA 94560
- Reassigned Medicare billing, California enrollment
- 435 clinicians in this Medicare group
Stockton, CA 95204
- Reassigned Medicare billing, California enrollment
- 83 clinicians in this Medicare group
Long Beach, CA 90806
- Reassigned Medicare billing, California enrollment
- 191 clinicians in this Medicare group
San Diego, CA 92123
- Reassigned Medicare billing, California enrollment
- 1,437 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 94582 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Maria Quan's NPI number?
The NPI number for Maria Quan is 1043281405. It was assigned to this individual provider in the NPPES registry on February 1, 2006.
Where is Maria Quan located?
Maria Quan practices at 11030 Bollinger Canyon Rd Ste 200, San Ramon, CA 94582. The listed phone number is (925) 263-5583.
What is Maria Quan's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Maria Quan enrolled in Medicare?
Yes. Maria Quan 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 Maria Quan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Maria Quan reassigns Medicare benefits to 4 organizations: University Healthcare Alliance (Newark, CA), Dhp Of California Medical Group Inc (Stockton, CA), Magella Medical Group, Inc. (Long Beach, CA) and Emergency And Acute Care Medical Corporation (San Diego, 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 Maria Quan'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 Maria Quan was last updated on May 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Maria C Quan, MD · NPI 1043281405
Obstetrics & Gynecology physician in San Ramon, California. Individual provider, active in the CMS NPPES registry since February 1, 2006.
## Identity
- **NPI:** 1043281405 (Entity type: Individual)
- **Enumerated:** February 1, 2006
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** C143703 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 11030 BOLLINGER CANYON RD STE 200, San Ramon, CA 94582-4826
- **Phone:** (925) 263-5583
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): University Healthcare Alliance (NPI 1760531198, Newark, CA); Dhp Of California Medical Group Inc (NPI 1679836084, Stockton, CA); Magella Medical Group, Inc. (NPI 1376640086, Long Beach, CA); Emergency And Acute Care Medical Corporation (NPI 1437103942, San Diego, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1989
## Record status
- **NPPES last updated:** May 18, 2026
- **Other identifiers:** Medicaid 8245193 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1043281405) · Data from the CMS NPPES public registry.