Siavosh Vossough, M.D.
Dermatology Physician · Los Altos, CA
Siavosh Vossough, M.D. is a dermatology physician with a practice address in Los Altos, California, and NPI 1922192111, issued on Oct 3, 2006. Check the license (California A61091, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Siavosh Vossough
- Credential
- M.D.
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- A61091 CA
Self-reported in NPPES; status is on the state search - Practice location
- 851 Fremont Ave, Los Altos, CA 94024
- Phone
- (650) 949-2771
- Enumerated
- Oct 3, 2006
- Record last updated
- May 27, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (650) 949-2388
- Medicare enrollment
- Enrolled (PECOS I20040915000525); accepts Medicare assignment
- Medical or professional school
- Albany Medical College Of Union University, 1995
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 2,083 in California → Look up another NPI →
Also registered at 851 Fremont Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nancy Andersen, MFTMarriage & Family Therapist1780009738
- Merry Astor, MA LMFTMarriage & Family Therapist1720294044
- Jeanette Bland, M.D.Psychiatry Physician1851459192
- Lourdes Bella Bourdon, PTPhysical Therapist1811092919
- William Buchholz, MDHematology (Internal Medicine) Physician1699774406
- Louise Burton, MFTMarriage & Family Therapist1417095977
Verify Siavosh Vossough in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A61091Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
64% fewer Medicare Part D claims than the average dermatology physician in 2024
288 Medicare Part D claims for 136 beneficiaries, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Triamcinolone Acetonide51 claims
- Ketoconazole50 claims
- Hydrocortisone36 claims
- Clobetasol Propionate23 claims
- Valacyclovir22 claims
- Fluocinonide12 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): 85.1 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).
Siavosh Vossough among 2,083 dermatology physician records in California
Siavosh Vossough, M.D. is one of 2,083 dermatology physician records with a practice address in California. 83% 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, 56% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1995 · median 2006 among the 1,450 with a school on file
- Record last updated2008 · 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 207N00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dermatology Physician providers in California
There are 2,083 dermatology physician records in California.
All 2,083 in California → Every provider in Los Altos → Dermatology Physician nationwide →
The 8 dermatology physician records with the nearest ZIP codes
- Nancy Petersilge, M.D.Los Altos, CA 940241467609396
- Audrey Fetch, M.D.Menlo Park, CA 940251093158495
- Sarah Jacobson, M.D.Menlo Park, CA 940251447392493
- Diana Leu, MDMenlo Park, CA 940251609032242
- Tara Miller, MDMenlo Park, CA 940251477685907
- Dale Pearlman, M.D.Menlo Park, CA 940251619082047
- Mary Sheu, MDMenlo Park, CA 940251659338705
- Joellen Vanzander, MDMenlo Park, CA 940251881819019
Common questions
What is Siavosh Vossough, M.D.'s NPI number?
Siavosh Vossough, M.D.'s National Provider Identifier (NPI) is 1922192111, issued on Oct 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Siavosh Vossough, M.D. located?
The NPPES record lists a practice address at 851 Fremont Ave, Los Altos, CA, 94024. Phone: (650) 949-2771. Providers update this record themselves, so call before visiting.
How can I verify Siavosh Vossough, M.D.'s license?
NPPES lists California license number A61091, 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 Siavosh Vossough, M.D. prescribe under Medicare Part D?
In 2024, Siavosh Vossough, M.D. had 288 Medicare Part D claims for 136 beneficiaries; the average among dermatology physician prescribers was 797. Part D covers Medicare prescriptions only.
What is Siavosh Vossough, M.D.'s MIPS final score?
The 2023 MIPS final score is 85.1 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.