Margaret Lo, M.D.
Family Medicine Physician · Los Altos, CA
Margaret Lo, M.D. is a family medicine physician with a practice address in Los Altos, California, and NPI 1174653992, issued on Mar 7, 2007. Check the license (California A95854, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Margaret Lo
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A95854 CA
Self-reported in NPPES; status is on the state search - Practice location
- 370 Distel Cir, Los Altos, CA 94022
- Phone
- (650) 254-5200
- Enumerated
- Mar 7, 2007
- Record last updated
- May 27, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20090520000273); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 2004
- 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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- Aimee Blaustein, MDPediatrics Physician1184717233
Verify Margaret Lo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A95854Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average family medicine physician in 2024
644 Medicare Part D claims for 97 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium57 claims
- Amlodipine Besylate46 claims
- Hydrochlorothiazide31 claims
- Losartan Potassium26 claims
- Lisinopril25 claims
- Metformin Hcl24 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).
Margaret Lo among 17,133 family medicine physician records in California
Margaret Lo, M.D. 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 2007, is newer than 41% of them.
- NPI issued2007 · 41% of these records are older, 47% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2004 · median 2005 among the 10,652 with a school on file
- Record last updated2020 · 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
- Julia Marx, MDLos Altos, CA 940221316039183
- Karen McGann, MDLos Altos, CA 940221235221904
Common questions
What is Margaret Lo, M.D.'s NPI number?
Margaret Lo, M.D.'s National Provider Identifier (NPI) is 1174653992, issued on Mar 7, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Lo, M.D. located?
The NPPES record lists a practice address at 370 Distel Cir, Los Altos, CA, 94022. Phone: (650) 254-5200. Providers update this record themselves, so call before visiting.
How can I verify Margaret Lo, M.D.'s license?
NPPES lists California license number A95854, 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 Margaret Lo, M.D. prescribe under Medicare Part D?
In 2024, Margaret Lo, M.D. had 644 Medicare Part D claims for 97 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.