CYNTHIA S. MATES MD
NPI 1679645329
Dermatology in Martinez, CA
About Cynthia S. Mates Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CYNTHIA S. MATES MD (NPI 1679645329) is an individual dermatology provider in Martinez, California, licensed in California (A91022) and active in the NPI registry since November 2006. She is enrolled in Medicare PECOS and is a graduate of University Of California, Davis School Of Medicine (1999).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
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
Cynthia S. Mates 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 Reassignment
Medicare enrollment records show Cynthia Mates reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Vallejo, CA 94589
- Reassigned Medicare billing, California enrollment
- 20,078 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 94553 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MARTINEZ, CA 94553
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 Cynthia Mates's NPI number?
The NPI number for Cynthia Mates is 1679645329. It was assigned to this individual provider in the NPPES registry on November 15, 2006. The provider is also known as Cynthia Joy Sasaki.
Where is Cynthia Mates located?
Cynthia Mates practices at 200 Muir Rd, Martinez, CA 94553. The listed phone number is (925) 372-1000.
What is Cynthia Mates's specialty?
The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.
Is Cynthia Mates enrolled in Medicare?
Yes. Cynthia Mates 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 organization bills Medicare for Cynthia Mates's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Cynthia Mates reassigns Medicare benefits to Permanente Medical Group Inc (Vallejo, CA). The 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 Cynthia Mates'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 Cynthia Mates was last updated on January 6, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.
# Cynthia S. Mates, MD · NPI 1679645329
Dermatology physician in Martinez, California. Individual provider, active in the CMS NPPES registry since November 15, 2006.
## Identity
- **NPI:** 1679645329 (Entity type: Individual)
- **Enumerated:** November 15, 2006
- **Primary specialty:** Dermatology · taxonomy 207N00000X
- **State license:** A91022 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 200 MUIR RD, Martinez, CA 94553-4614
- **Phone:** (925) 372-1000
## 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:** Permanente Medical Group Inc (NPI 1336222397, Vallejo, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, Davis School Of Medicine, class of 1999
## Record status
- **NPPES last updated:** January 6, 2022
- **Other identifiers:** Medicaid 00A910220 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1679645329) · Data from the CMS NPPES public registry.