Dean Masao Osumi, DEAN OSUMI, DDS
General Practice Dentistry · San Francisco, CA
Dean Masao Osumi, DEAN OSUMI, DDS is a general practice dentistry with a practice address in San Francisco, California, and NPI 1174760268, issued on Jan 12, 2009. Check the license (California CA 45745, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Dean Masao Osumi
- Credential
- DEAN OSUMI, DDS
- Primary taxonomy
- General Practice Dentistry 1223G0001X
- License number
- CA 45745 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1622 Post St, San Francisco, CA 94115
- Phone
- (415) 567-5200
- Enumerated
- Jan 12, 2009
- Record last updated
- Jan 12, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (415) 567-0777
- Entity
- Type 1 · individual
8 nearest general practice dentistry records → All 17,852 in California → Look up another NPI →
Also registered at 1622 Post St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lawrence Nakamura, D.D.S.Dentist1265764609
Verify Dean Masao Osumi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license CA 45745Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average general practice dentistry in 2024
13 Medicare Part D claims for 11 beneficiaries, against an average of 83 among the 70,290 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.
Dean Masao Osumi among 17,852 general practice dentistry records in California
Dean Masao Osumi, DEAN OSUMI, DDS is one of 17,852 general practice dentistry records with a practice address in California. 57% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 65% of them.
- NPI issued2009 · 65% of these records are older, 32% newer
- In a Medicare fileYes · 57% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2009 · 79% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223G0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
667 general practice dentistry records list a practice address in San Francisco
They are 667 of the 38,143 NPPES records with a practice address in San Francisco, and 17,852 general practice dentistry records in California.
All 17,852 in California → Every provider in San Francisco → General Practice Dentistry nationwide →
The 8 general practice dentistry records with the nearest ZIP codes
- Richard Cohan, D.D.S.San Francisco, CA 941151568589489
- Leonel Dickey, D.D.S.San Francisco, CA 941151487729729
- Stafford Duhn, DDSSan Francisco, CA 941151013092261
- Thomas Ellerhorst, D.D.S.San Francisco, CA 941151174620033
- Johnnie Fong, DDSSan Francisco, CA 941151174541478
- Peter Jacobsen, DDSSan Francisco, CA 941151639174923
- Thomas Kuhn, DDSSan Francisco, CA 941151548268642
- Emiliana Lopez, D.D.S.San Francisco, CA 941151972688869
Common questions
What is Dean Masao Osumi, DEAN OSUMI, DDS's NPI number?
Dean Masao Osumi, DEAN OSUMI, DDS's National Provider Identifier (NPI) is 1174760268, issued on Jan 12, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Dean Masao Osumi, DEAN OSUMI, DDS located?
The NPPES record lists a practice address at 1622 Post St, San Francisco, CA, 94115. Phone: (415) 567-5200. Providers update this record themselves, so call before visiting.
How can I verify Dean Masao Osumi, DEAN OSUMI, DDS's license?
NPPES lists California license number CA 45745, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Dean Masao Osumi, DEAN OSUMI, DDS prescribe under Medicare Part D?
In 2024, Dean Masao Osumi, DEAN OSUMI, DDS had 13 Medicare Part D claims for 11 beneficiaries; the average among general practice dentistry prescribers was 83. 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.