Dr. Marsha Feldman Armstrong, MD
- Medicare services, 2023
- 98
- Part D claims, 2024
- 51
- Affiliated sites
- 1
- State license
- 1
- Year NPI issued
- 2006
- Practice address
- 340 Dardanelli Lane, Los Gatos, CA 95032-1418
- Practice phone
- Call (408) 374-4280
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Valley Infusion Center
Physician office · Los Gatos, California
Find Dr. Armstrong's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Marsha Feldman Armstrong is an internist in Stanford, California
Dr. Armstrong practices at Valley Infusion Center in Los Gatos, California.
Dr. Armstrong's NPI, 1417041765, was assigned on October 3, 2006. Dr. Armstrong graduated from Stanford University School Of Medicine in 1966. Dr. Armstrong holds California license G14057.
- NPI
- 1417041765NPI Registry (opens in a new tab)
- NPI enumeration date
- October 3, 2006
- NPI status
- Active
- Practice phone
- (408) 374-4280
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 86
- Medical school graduation
- 1966
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Marsha Feldman Armstrong practices in Los Gatos and Stanford
Dr. Armstrong's primary practice is Valley Infusion Center, at 340 Dardanelli Lane, Los Gatos, CA 95032-1418. The practice phone is (408) 374-4280. The NPI Registry lists Dr. Armstrong's practice address as 300 Pasteur Dr, Stanford, CA 94305.
- Valley Infusion CenterPrimary340 Dardanelli Lane, Los Gatos, CA 95032-1418Phone(408) 374-4280
- NPI Registry address300 Pasteur Dr, Stanford, CA 94305 · Santa Clara CountyPhone(408) 370-3611
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Marsha Feldman Armstrong is affiliated with 1 site of care
Dr. Armstrong's primary practice is Valley Infusion Center in Los Gatos, California.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Marsha Feldman Armstrong's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Armstrong practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Valley Infusion Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Marsha Feldman Armstrong is one of 16,751 internists in California
Internal medicine is Dr. Armstrong's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Armstrong is board certified in internal medicine by the American Board of Internal Medicine. Dr. Armstrong is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acute sinusitis, acute skin infection, asthma, atrial fibrillation and flutter, bronchitis, chronic anemia, chronic diabetes and chronic hypertension among the conditions Dr. Armstrong treats.
Internists near Dr. Armstrong
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Marsha Feldman Armstrong billed Medicare for 98 services in 2023
CMS data shows 98 Medicare services from Dr. Armstrong across 2 procedure codes in 2023, all of them office visits. Medicare paid $11,081 for them. Every service was in an office.
Dr. Armstrong's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 2622023: 9863%
Dr. Armstrong compared with the California median for internists, 2023
- Dr. Armstrong
- California median
- Medicare services
- 98vs 36173% below
- Part D claims
- 650vs 42154% above
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Armstrong's most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marsha Feldman Armstrong's patients have a median age of 77
Across all payers, Dmand AI patient panel data puts Dr. Armstrong's median patient age at 77, with 59% women.
Dr. Armstrong's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 77
Patient panel by sex, all payers
- Women59%
- Men35%
Source: Dmand AI Patient Panel Data
Dr. Marsha Feldman Armstrong wrote 51 Medicare Part D claims in 2024
In 2024, Dr. Armstrong wrote 51 Medicare Part D claims for 17 patients. 76% of them were for generic drugs. They cover 30 drugs, with $33,200 in total drug cost. In 2022, CMS named 946 claims across 40 drugs.
Dr. Armstrong's Part D claims by kind of drug, 2024
- Generic39 claims76%
- Brand-name12 claims24%
Dr. Armstrong's most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 9462023: 65031%
Drugs named by CMS: 30 in 2023, 40 in 2022.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Marsha Feldman Armstrong graduated from Stanford University School Of Medicine
Dr. Armstrong graduated from Stanford University School Of Medicine in 1966.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Marsha Feldman Armstrong's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Marsha Feldman Armstrong
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Marsha Feldman Armstrong's NPI number?
Dr. Marsha Feldman Armstrong's NPI number is 1417041765. It was assigned on October 3, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Marsha Feldman Armstrong?
Dr. Marsha Feldman Armstrong is an internist in Stanford, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Marsha Feldman Armstrong practice?
Dr. Armstrong practices at 340 Dardanelli Lane, Los Gatos, CA 95032-1418. Dr. Armstrong also practices at 300 Pasteur Dr, Stanford, CA 94305. Dr. Armstrong's primary practice is Valley Infusion Center in Los Gatos, California.
What is Dr. Marsha Feldman Armstrong's office phone number?
The practice phone on file for Dr. Armstrong is (408) 374-4280.
What is Dr. Marsha Feldman Armstrong's medical license number?
Dr. Armstrong holds California license G14057.
Does Dr. Marsha Feldman Armstrong accept Medicare?
Yes. CMS data shows Dr. Armstrong billed Medicare for 98 services in 2023.
Is Dr. Marsha Feldman Armstrong board certified?
Yes. Dr. Armstrong is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Marsha Feldman Armstrong bill to Medicare?
In 2023, Dr. Armstrong's most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99215).
Where did Dr. Marsha Feldman Armstrong go to medical school?
Dr. Armstrong graduated from Stanford University School Of Medicine in 1966.
What drugs does Dr. Marsha Feldman Armstrong prescribe most?
In 2023 Medicare Part D data, Dr. Armstrong's most prescribed drugs by claims were Levothyroxine Sodium, Potassium Chloride and Allopurinol.
How long has Dr. Marsha Feldman Armstrong been practicing?
Dr. Armstrong graduated from medical school in 1966, 60 years ago.
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