William Patrick Joseph, M.D.
Infectious Disease Physician · San Ramon, CA
William Patrick Joseph, M.D. is an infectious disease physician with a practice address in San Ramon, California, and NPI 1356423255, issued on Oct 19, 2006. Check the license (California G27536, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Patrick Joseph
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- G27536 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5601 Norris Canyon RD, San Ramon, CA 94583
- Phone
- (925) 277-2050
- Enumerated
- Oct 19, 2006
- Record last updated
- Apr 19, 2022
- Fax
- (925) 275-1018
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 5601 Norris Canyon RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lauren Alexander, RN, MSN, ANP-BCGeneral Practice Registered Nurse1689866998
- Richard Ash, MDPediatrics Physician1366445298
- Tsuling Chang, M.D.Dermatology Physician1154495240
- Sandy Chhiv, FNPFamily Nurse Practitioner1487102794
- Bradford Flagg, M.D.Family Medicine Physician1346323086
- Jayaram Hariharan, M.D.Family Medicine Physician1790004638
Verify William Patrick Joseph in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G27536Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average infectious disease physician in 2024
66 Medicare Part D claims, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D.
Most prescribed
- Clonazepam14 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.
William Patrick Joseph among 1,119 infectious disease physician records in California
William Patrick Joseph, M.D. is one of 1,119 infectious disease 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 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 54% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2022 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in San Ramon → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Valerie Chirurgi, MDPleasanton, CA 945881992777080
- Likuo Kong, MDPleasanton, CA 945881518931047
- Eileen Nenninger, MDSan Leandro, CA 945781295199966
- Richard Shen, M.D.San Leandro, CA 945781942663919
- Jeffrey Silvers, M.D.San Leandro, CA 945781033292701
- Nida Subhani, MDPleasanton, CA 945881770747784
- Jeffrey Klausner, MDSan Leandro, CA 945771508973249
- Nicholas Moss, MDSan Leandro, CA 945771124101662
Common questions
What is William Patrick Joseph, M.D.'s NPI number?
William Patrick Joseph, M.D.'s National Provider Identifier (NPI) is 1356423255, issued on Oct 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Patrick Joseph, M.D. located?
The NPPES record lists a practice address at 5601 Norris Canyon RD, San Ramon, CA, 94583. Phone: (925) 277-2050. Providers update this record themselves, so call before visiting.
How can I verify William Patrick Joseph, M.D.'s license?
NPPES lists California license number G27536, 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 William Patrick Joseph, M.D. prescribe under Medicare Part D?
In 2024, William Patrick Joseph, M.D. had 66 Medicare Part D claims; the average among infectious disease physician prescribers was 689. 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.