GARY BIRNBAUM MD PROF CORP
NPI 1255807152
Family Medicine in Mill Valley, CA
About Gary Birnbaum Md Prof Corp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GARY BIRNBAUM MD PROF CORP (NPI 1255807152) is a healthcare organization registered as a family medicine in Mill Valley, California and active in the NPI registry since October 2018. The organization lists David G Harnden, Administrative Manager, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Gary Birnbaum Md Prof Corp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Gary Birnbaum MD Prof Corp, which bills Medicare for the services this clinician delivers.
Clinician (1)
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Gary Birnbaum MD Prof Corp's NPI number?
The NPI number for Gary Birnbaum MD Prof Corp is 1255807152. It was assigned to this organization in the NPPES registry on October 17, 2018.
Where is Gary Birnbaum MD Prof Corp located?
Gary Birnbaum MD Prof Corp is located at 97 Vista Del Sol, Mill Valley, CA 94941. The listed phone number is (415) 350-0639.
What is Gary Birnbaum MD Prof Corp's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Gary Birnbaum MD Prof Corp enrolled in Medicare?
Yes. Gary Birnbaum MD Prof Corp is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Gary Birnbaum MD Prof Corp?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Family Practice) reassigns their Medicare billing to Gary Birnbaum MD Prof Corp. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Gary Birnbaum MD Prof Corp was last updated on October 17, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Gary Birnbaum Md Prof Corp · NPI 1255807152
Family Medicine organization in Mill Valley, California. Organization record, active in the CMS NPPES registry since October 17, 2018.
## Identity
- **NPI:** 1255807152 (Entity type: Organization)
- **Enumerated:** October 17, 2018
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **Organization subpart:** No
- **Authorized official:** David Harnden, ADMINISTRATIVE MANAGER
## Practice location
- **Address:** 97 VISTA DEL SOL, Mill Valley, CA 94941-4920
- **Phone:** (415) 350-0639 · **Fax:** (415) 366-2882
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 1 clinician (Family Practice) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 17, 2018
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Source: [NPI Profile](https://npiprofile.com/npi/1255807152) · Data from the CMS NPPES public registry.