Simon Anthony Humphries, MD
Internal Medicine Physician · Los Altos, CA
Simon Anthony Humphries, MD is an internal medicine physician with a practice address in Los Altos, California, and NPI 1023149440, issued on Mar 8, 2007. Check the license (California G067109, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Simon Anthony Humphries
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G067109 CA
Self-reported in NPPES; status is on the state search - Practice location
- 811 Altos Oaks Dr, Los Altos, CA 94024
- Phone
- (650) 917-6920
- Enumerated
- Mar 8, 2007
- Record last updated
- Jul 30, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (650) 917-6925
- Medicare enrollment
- Enrolled (PECOS I20110119001150); may accept Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 1987
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 811 Altos Oaks Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Simon Anthony Humphries in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G067109Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,602 Medicare Part D claims for 286 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 47 claims were for opioids.
Most prescribed
- Atorvastatin Calcium175 claims
- Trazodone Hcl119 claims
- Levothyroxine Sodium88 claims
- Tamsulosin Hcl87 claims
- Divalproex Sodium68 claims
- Lisinopril67 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.
The MIPS final score for 2023 (Medicare payment program): 12.4 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $252.44
12 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Simon Anthony Humphries among 17,696 internal medicine physician records in California
Simon Anthony Humphries, 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1987 · median 2004 among the 11,065 with a school on file
- Record last updated2010 · 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).
29 internal medicine physician records list a practice address in Los Altos
They are 29 of the 718 NPPES records with a practice address in Los Altos, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Los Altos → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Steven Hamman, M.D.Los Altos, CA 940241306289004
- Steven Natterstad, M.D.Los Altos, CA 940241710048921
- Patricia Sitnitsky, M.D.Los Altos, CA 940241790896231
- Susan Sorensen, MDLos Altos, CA 940241366523862
- Charles Tuchinda, M.D.Los Altos, CA 940241063641702
- Susan Garay, MDMenlo Park, CA 940251437114006
- F McDowell, MDMenlo Park, CA 940251154384576
- Eileen Moy, MDMenlo Park, CA 940251083617583
Common questions
What is Simon Anthony Humphries, MD's NPI number?
Simon Anthony Humphries, MD's National Provider Identifier (NPI) is 1023149440, issued on Mar 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Simon Anthony Humphries, MD located?
The NPPES record lists a practice address at 811 Altos Oaks Dr, Los Altos, CA, 94024. Phone: (650) 917-6920. Providers update this record themselves, so call before visiting.
How can I verify Simon Anthony Humphries, MD's license?
NPPES lists California license number G067109, 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 Simon Anthony Humphries, MD prescribe under Medicare Part D?
In 2024, Simon Anthony Humphries, MD had 2,602 Medicare Part D claims for 286 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Simon Anthony Humphries, MD's MIPS final score?
The 2023 MIPS final score is 12.4 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.