William Mack Shannon, PH.D.
Clinical Psychologist · Oakland, CA
William Mack Shannon, PH.D. is a clinical psychologist with a practice address in Oakland, California, and NPI 1063668275, issued on Aug 7, 2008. Check the license (California PSY22103, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William Mack Shannon
- Credential
- PH.D.
- Primary taxonomy
- Clinical Psychologist 103TC0700X
- License number
- PSY22103 CA
Self-reported in NPPES; status is on the state search - Practice location
- 625 16TH St Unit 401, Oakland, CA 94612
- Phone
- (510) 290-6203
- Enumerated
- Aug 7, 2008
- Record last updated
- Sep 27, 2024
- Medicare enrollment
- Enrolled (PECOS I20100315000885); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest clinical psychologist records → All 12,647 in California → Look up another NPI →
Verify William Mack Shannon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PSY22103Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Ehab Yacoub MD IncGardena, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Mack Shannon among 12,647 clinical psychologist records in California
William Mack Shannon, PH.D. is one of 12,647 clinical psychologist records with a practice address in California. 9% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 43% of them.
- NPI issued2008 · 43% of these records are older, 51% newer
- In a Medicare fileYes · 9% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated1991 · median 2006 among the 2,424 with a school on file
- Record last updated2024 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103TC0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
354 clinical psychologist records list a practice address in Oakland
They are 354 of the 18,558 NPPES records with a practice address in Oakland, and 12,647 clinical psychologist records in California.
All 12,647 in California → Every provider in Oakland → Clinical Psychologist nationwide →
The 8 clinical psychologist records with the nearest ZIP codes
- Andreas Bollinger, PH.D.Oakland, CA 946121700079530
- Nicole Chambers, PSY.D.Oakland, CA 946121821297029
- Maryann D'Onofrio, PH.D., MFTOakland, CA 946121801006952
- Ahmed El-Sokkary, PSYDOakland, CA 946121619169380
- Alicia English, PH.D.Oakland, CA 946121104808278
- Marlin GriffithOakland, CA 946121437174760
- David Hawkey, PSY.D.Oakland, CA 946121427179662
- K Benjamin Knipe, PSYDOakland, CA 946121962537613
Common questions
What is William Mack Shannon, PH.D.'s NPI number?
William Mack Shannon, PH.D.'s National Provider Identifier (NPI) is 1063668275, issued on Aug 7, 2008. An NPI identifies a provider in billing; it is not a license.
Where is William Mack Shannon, PH.D. located?
The NPPES record lists a practice address at 625 16TH St Unit 401, Oakland, CA, 94612. Phone: (510) 290-6203. Providers update this record themselves, so call before visiting.
How can I verify William Mack Shannon, PH.D.'s license?
NPPES lists California license number PSY22103, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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.