Mark R. Naas, PSY
Psychologist · Oakland, CA
Mark R. Naas, PSY is a psychologist with a practice address in Oakland, California, and NPI 1427156850, issued on Sep 20, 2006. Check the license (California PSY19156, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark R. Naas
- Credential
- PSY
- Primary taxonomy
- Psychologist 103T00000X
- License number
- PSY19156 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3873 Piedmont Ave Ste 2, Oakland, CA 94611
- Phone
- (925) 203-5810
- Enumerated
- Sep 20, 2006
- Record last updated
- Mar 14, 2024
- Entity
- Type 1 · individual
8 nearest psychologist records → All 7,304 in California → Look up another NPI →
Verify Mark R. Naas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PSY19156Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mark R. Naas among 7,304 psychologist records in California
Mark R. Naas, PSY is one of 7,304 psychologist records with a practice address in California. 6% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 1% of them.
- NPI issued2006 · 1% of these records are older, 82% newer
- In a Medicare fileNo · 6% of these records are
- In the CMS Doctors and Clinicians fileNo · 14% of these records are
- Record last updated2024 · 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 103T00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
257 psychologist records list a practice address in Oakland
They are 257 of the 18,558 NPPES records with a practice address in Oakland, and 7,304 psychologist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 7,304 in California → Every provider in Oakland → Psychologist nationwide →
The 8 psychologist records with the nearest ZIP codes
- Peter Chang, PH.D.Oakland, CA 946111487762217
- Stephen Francis, PH.D.Oakland, CA 946111194808782
- Ann Gildersleeve, PH.D.Oakland, CA 946111588653067
- Eugenie Hsu, PHDOakland, CA 946111578627907
- Laurie Katz, PH.D.Oakland, CA 946111477600476
- Kathleen Longwell, PH.D.Piedmont, CA 946111215962758
- Betty Moulton, PHDOakland, CA 946111538226428
- Kate Mountain, PHDOakland, CA 946111063574218
Common questions
What is Mark R. Naas, PSY's NPI number?
Mark R. Naas, PSY's National Provider Identifier (NPI) is 1427156850, issued on Sep 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark R. Naas, PSY located?
The NPPES record lists a practice address at 3873 Piedmont Ave Ste 2, Oakland, CA, 94611. Phone: (925) 203-5810. Providers update this record themselves, so call before visiting.
How can I verify Mark R. Naas, PSY's license?
NPPES lists California license number PSY19156, 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. 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.