Marsha Feldman Armstrong, MD
Internal Medicine Physician · Los Gatos, CA
Marsha Feldman Armstrong, MD is an internal medicine physician with a practice address in Los Gatos, California, and NPI 1417041765, issued on Oct 3, 2006. Check the license (California G14057, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Marsha Feldman Armstrong
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G14057 CA
Self-reported in NPPES; status is on the state search - Practice location
- 777 Knowles Dr, Los Gatos, CA 95032
- Phone
- (408) 370-3611
- Enumerated
- Oct 3, 2006
- Record last updated
- Mar 20, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (408) 370-3688
- Medicaid ID
- 2063817 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
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Verify Marsha Feldman Armstrong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G14057Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
51 Medicare Part D claims for 17 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Marsha Feldman Armstrong among 17,696 internal medicine physician records in California
Marsha Feldman Armstrong, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2013 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
47 internal medicine physician records list a practice address in Los Gatos
They are 47 of the 1,905 NPPES records with a practice address in Los Gatos, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Los Gatos → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mandeep Ayer, M.D.Los Gatos, CA 950321205817111
- Gopi Ayer, M.D.Los Gatos, CA 950321396701512
- Richard Bobis, M.D.Los Gatos, CA 950321407813843
- Edward Brooks, MDLos Gatos, CA 950321831162338
- Andrew Chi, MD MPHLos Gatos, CA 950321700861275
- Jane Chien, MDLos Gatos, CA 950321588620785
- Linda Eglin, MDLos Gatos, CA 950321144223611
- Stacey Hein, INTERNAL MEDICINELos Gatos, CA 950321568429983
Common questions
What is Marsha Feldman Armstrong, MD's NPI number?
Marsha Feldman Armstrong, MD's National Provider Identifier (NPI) is 1417041765, issued on Oct 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marsha Feldman Armstrong, MD located?
The NPPES record lists a practice address at 777 Knowles Dr, Los Gatos, CA, 95032. Phone: (408) 370-3611. Providers update this record themselves, so call before visiting.
How can I verify Marsha Feldman Armstrong, MD's license?
NPPES lists California license number G14057, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marsha Feldman Armstrong, MD prescribe under Medicare Part D?
In 2024, Marsha Feldman Armstrong, MD had 51 Medicare Part D claims for 17 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.