DR. NANCY M. MARX PH.D.
NPI 1700835923
Psychologist in San Mateo, CA
About Dr. Nancy M. Marx Ph.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NANCY M. MARX PH.D. (NPI 1700835923) is an individual psychologist in San Mateo, California, licensed in California (PSY17090) and active in the NPI registry since May 2006. She has opted out of Medicare through February 29, 2028 and remains eligible to order and refer.
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Opted out of Medicare
Dr. Nancy M. Marx Ph.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from February 28, 2016 through February 29, 2028.
Other Providers at the Same Location NPPES 3
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 Nancy Marx's NPI number?
The NPI number for Nancy Marx is 1700835923. It was assigned to this individual provider in the NPPES registry on May 6, 2006.
Where is Nancy Marx located?
Nancy Marx practices at 155 Bovet Rd Suite 404, San Mateo, CA 94402. The listed phone number is (650) 562-1904.
What is Nancy Marx's specialty?
The primary specialty registered for this NPI is Psychologist with taxonomy code 103T00000X.
Is Nancy Marx enrolled in Medicare?
No. Nancy Marx has opted out of Medicare through February 29, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.
When was this NPI record last updated?
The NPPES record for Nancy Marx was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 days 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.