William J. Sieber, PH.D.
Clinical Psychologist · San Diego, CA
William J. Sieber, PH.D. is a clinical psychologist with a practice address in San Diego, California, and NPI 1851413165, issued on Apr 6, 2007. Check the license (California 19435, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William J. Sieber
- Credential
- PH.D.
- Primary taxonomy
- Clinical Psychologist 103TC0700X
- License number
- 19435 CA
Self-reported in NPPES; status is on the state search - Practice location
- 200 W Arbor Dr, San Diego, CA 92103
- Phone
- (800) 926-8273
- Enumerated
- Apr 6, 2007
- Record last updated
- Feb 5, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20070927000739); 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 →
Also registered at 200 W Arbor Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William J. Sieber in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 19435Check 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 2 group practices
- Regents OF The University OF CaliforniaSan Diego, CA
- UC San Diego Health Community GroupSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William J. Sieber among 12,647 clinical psychologist records in California
William J. Sieber, 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 2007, is newer than 20% of them.
- NPI issued2007 · 20% of these records are older, 57% newer
- In a Medicare fileYes · 9% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated1984 · median 2006 among the 2,424 with a school on file
- Record last updated2019 · 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).
983 clinical psychologist records list a practice address in San Diego
They are 983 of the 52,937 NPPES records with a practice address in San Diego, and 12,647 clinical psychologist records in California.
All 12,647 in California → Every provider in San Diego → Clinical Psychologist nationwide →
The 8 clinical psychologist records with the nearest ZIP codes
- Nina Akin, P.H.DSan Diego, CA 921031104897222
- Anita Aylor, PHDSan Diego, CA 921031053362160
- Mei-I Chang, PSY.D.San Diego, CA 921031649229048
- Diane Ghiron, PSY.D.San Diego, CA 921031962492520
- Elizabeth Green, PHDSan Diego, CA 921031013917368
- Steven Hickman, PSY.D.San Diego, CA 921031003873175
- Michael Monroe, PHDSan Diego, CA 921031649226721
- Valerie Pearson, PH.D.San Diego, CA 921031366437691
Common questions
What is William J. Sieber, PH.D.'s NPI number?
William J. Sieber, PH.D.'s National Provider Identifier (NPI) is 1851413165, issued on Apr 6, 2007. An NPI identifies a provider in billing; it is not a license.
Where is William J. Sieber, PH.D. located?
The NPPES record lists a practice address at 200 W Arbor Dr, San Diego, CA, 92103. Phone: (800) 926-8273. Providers update this record themselves, so call before visiting.
How can I verify William J. Sieber, PH.D.'s license?
NPPES lists California license number 19435, 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.