Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Marsha Feldman Armstrong, MD

Internal Medicine Physician in Los Gatos, CA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1417041765

Verified

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Registry record

Entity type Individual (Type 1)

Name Marsha Feldman Armstrong

Credential MD

Sex Female

Practice address Los Gatos, CA, 95032

Phone (408) 370-3611

Fax (408) 370-3688

Enumeration date Oct 3, 2006

Last updated in NPPES Mar 20, 2013

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License G14057 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
2063817	Medicaid	CA	-
00G140570	Other	CA	MEDICARE PTAN

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Marsha Armstrong practice?

The practice location on file with NPPES is in Los Gatos, CA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Marsha Armstrong?

The National Provider Identifier (NPI) for Marsha Armstrong is 1417041765, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-03-20.