Julia Marx, MD
Family Medicine Physician · Los Altos, CA
Julia Marx, MD is a family medicine physician with a practice address in Los Altos, California, and NPI 1316039183, issued on Sep 29, 2006. Check the license (California A61863, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Julia Marx
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A61863 CA
Self-reported in NPPES; status is on the state search - Practice location
- 370 Distel Cir, Los Altos, CA 94022
- Phone
- (209) 603-8524
- Enumerated
- Sep 29, 2006
- Record last updated
- Dec 15, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080811000730); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 1995
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 370 Distel Cir
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Julia Marx in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A61863Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average family medicine physician in 2024
2,133 Medicare Part D claims for 185 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 14 claims were for opioids.
Most prescribed
- Atorvastatin Calcium281 claims
- Losartan Potassium98 claims
- Amlodipine Besylate84 claims
- Gabapentin83 claims
- Levothyroxine Sodium76 claims
- Lisinopril74 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.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationLos Altos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Julia Marx among 17,133 family medicine physician records in California
Julia Marx, MD is one of 17,133 family medicine physician records with a practice address in California. 81% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1995 · median 2005 among the 10,652 with a school on file
- Record last updated2011 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
23 family medicine physician records list a practice address in Los Altos
They are 23 of the 718 NPPES records with a practice address in Los Altos, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Los Altos → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Liane Bacal, M.D.Los Altos, CA 940221518231331
- Romina DavarpanahLos Altos, CA 940221609037472
- Joycellen Floyd, MDLos Altos, CA 940221255423356
- Theresa Gavin, MDLos Altos, CA 940221932291937
- Tina LeungLos Altos, CA 940221053403097
- Irene LinLos Altos, CA 940221427140482
- Margaret Lo, M.D.Los Altos, CA 940221174653992
- Karen McGann, MDLos Altos, CA 940221235221904
Common questions
What is Julia Marx, MD's NPI number?
Julia Marx, MD's National Provider Identifier (NPI) is 1316039183, issued on Sep 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Julia Marx, MD located?
The NPPES record lists a practice address at 370 Distel Cir, Los Altos, CA, 94022. Phone: (209) 603-8524. Providers update this record themselves, so call before visiting.
How can I verify Julia Marx, MD's license?
NPPES lists California license number A61863, 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 Julia Marx, MD prescribe under Medicare Part D?
In 2024, Julia Marx, MD had 2,133 Medicare Part D claims for 185 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.