Maria Claire Demosthenous, D.O.
Psychiatry Physician · San Bruno, CA
Maria Claire Demosthenous, D.O. is a psychiatry physician with a practice address in San Bruno, California, and NPI 1992904064, issued on Jul 17, 2007. Check the license (California 20A10489, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Maria Claire Demosthenous
- Credential
- D.O.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License numbers
- 20A10489 CA
036118786 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1001 Bayhill Dr, San Bruno, CA 94066
- Phone
- (650) 552-9652
- Enumerated
- Jul 17, 2007
- Record last updated
- Feb 10, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (650) 552-9348
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Verify Maria Claire Demosthenous in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A10489Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average psychiatry physician in 2024
35 Medicare Part D claims, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Maria Claire Demosthenous among 8,673 psychiatry physician records in California
Maria Claire Demosthenous, D.O. is one of 8,673 psychiatry physician records with a practice address in California. 67% 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 33% of them.
- NPI issued2007 · 33% of these records are older, 48% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2009 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychiatry Physician providers in California
There are 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in San Bruno → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Lada Alexeenko, MDSan Bruno, CA 940661982870457
- Daryl BrowneSan Bruno, CA 940661225249295
- Evelyn Alarcon, MDRedwood City, CA 940631386873610
- Raya Almufti, M.D.Redwood City, CA 940631770742025
- Alexander Clarke, M.D.Redwood City, CA 940631982091062
- Stephen Cummings, M.D.Redwood City, CA 940631063567063
- Kenji Fujitani, M.D.Redwood City, CA 940631912352048
- Jai Gandhi, M.D.Redwood City, CA 940631952745424
Common questions
What is Maria Claire Demosthenous, D.O.'s NPI number?
Maria Claire Demosthenous, D.O.'s National Provider Identifier (NPI) is 1992904064, issued on Jul 17, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Maria Claire Demosthenous, D.O. located?
The NPPES record lists a practice address at 1001 Bayhill Dr, San Bruno, CA, 94066. Phone: (650) 552-9652. Providers update this record themselves, so call before visiting.
How can I verify Maria Claire Demosthenous, D.O.'s license?
NPPES lists California license number 20A10489, 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 Maria Claire Demosthenous, D.O. prescribe under Medicare Part D?
In 2024, Maria Claire Demosthenous, D.O. had 35 Medicare Part D claims; the average among psychiatry physician prescribers was 1,000. 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.