SARA MATHEW HOLMES MD
NPI 1801174479
Internal Medicine - Nephrology in Novato, CA
About Sara Mathew Holmes Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SARA MATHEW HOLMES MD (NPI 1801174479) is an individual nephrology provider in Novato, California, licensed in District Of Columbia (MD600004898) and active in the NPI registry since July 2011. She is enrolled in Medicare PECOS, maintains a secondary practice location in Washington, and is a graduate of Temple University School Of Medicine (2006).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 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
Sara Mathew Holmes 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
3Medicare enrollment records show Sara Holmes reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Richmond, CA 94801
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
Washington, DC 20037
- Reassigned Medicare billing, District of Columbia enrollment
- 1,275 clinicians in this Medicare group
Washington, DC 20032
- Reassigned Medicare billing, District of Columbia enrollment
- 158 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 94945 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.
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 Sara Holmes's NPI number?
The NPI number for Sara Holmes is 1801174479. It was assigned to this individual provider in the NPPES registry on July 29, 2011.
Where is Sara Holmes located?
Sara Holmes practices at 97 San Marin Dr, Novato, CA 94945. The listed phone number is (415) 899-7880.
What is Sara Holmes's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.
Is Sara Holmes enrolled in Medicare?
Yes. Sara Holmes 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 Sara Holmes's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sara Holmes reassigns Medicare benefits to 3 organizations: Permanente Medical Group Inc (Richmond, CA), Medical Faculty Associates, Inc (Washington, DC) and Foggy Bottom Physician Group Inc. (Washington, DC). 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 Sara Holmes'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 Sara Holmes was last updated on November 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Sara Mathew Holmes, MD · NPI 1801174479
Nephrology physician in Novato, California. Individual provider, active in the CMS NPPES registry since July 29, 2011.
## Identity
- **NPI:** 1801174479 (Entity type: Individual)
- **Enumerated:** July 29, 2011
- **Primary specialty:** Internal Medicine - Nephrology · taxonomy 207RN0300X
- **State license:** MD600004898 (District of Columbia)
- **Sole proprietor:** No
## Practice location
- **Address:** 97 SAN MARIN DR, Novato, CA 94945-1100
- **Phone:** (415) 899-7880 · **Fax:** (415) 899-7815
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Permanente Medical Group Inc (NPI 1235226531, Richmond, CA); Medical Faculty Associates, Inc (NPI 1417990581, Washington, DC); Foggy Bottom Physician Group Inc. (NPI 1831089846, Washington, DC) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Temple University School Of Medicine, class of 2006
## Record status
- **NPPES last updated:** November 5, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1801174479) · Data from the CMS NPPES public registry.