Katherine Louise Walker, PH.D.
Psychologist · Walnut Creek, CA
Katherine Louise Walker, PH.D. is a psychologist with a practice address in Walnut Creek, California, and NPI 1811055239, issued on Dec 5, 2006. Check the license (California PSY15553, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Katherine Louise Walker
- Credential
- PH.D.
- Primary taxonomy
- Psychologist 103T00000X
- License number
- PSY15553 CA
Self-reported in NPPES; status is on the state search - Practice location
- 710 S Broadway, Walnut Creek, CA 94596
- Phone
- (925) 295-5466
- Enumerated
- Dec 5, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (925) 295-5226
- Medicare enrollment
- Enrolled (PECOS I20131204000879); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest psychologist records → All 7,304 in California → Look up another NPI →
Also registered at 710 S Broadway
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Vince Brim, PSY.D.Clinical Psychologist1932378965
Verify Katherine Louise Walker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PSY15553Check 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
- Permanente Medical Group IncAntioch, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine Louise Walker among 7,304 psychologist records in California
Katherine Louise Walker, PH.D. 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. Its NPI, issued in 2006, is newer than 1% of them.
- NPI issued2006 · 1% of these records are older, 82% newer
- In a Medicare fileYes · 6% of these records are
- In the CMS Doctors and Clinicians fileYes · 14% of these records are
- Graduated1993 · median 2005 among the 1,058 with a school on file
- Record last updated2007 · 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).
76 psychologist records list a practice address in Walnut Creek
They are 76 of the 6,170 NPPES records with a practice address in Walnut Creek, and 7,304 psychologist records in California.
All 7,304 in California → Every provider in Walnut Creek → Psychologist nationwide →
The 8 psychologist records with the nearest ZIP codes
- Philip Becker, PH.D.Walnut Creek, CA 945961487722435
- Kelly Bush, PSY.D.Walnut Creek, CA 945961649321191
- Samantha Clemens, PH.D.Walnut Creek, CA 945961295802601
- James Fritz, PHDWalnut Creek, CA 945961144397407
- Margaret Hacker-Pollack, PHDWalnut Creek, CA 945961265596092
- Janice Helfand, PH.D.Walnut Creek, CA 945961770655854
- Marc Komori Stager, PSY.D.Walnut Creek, CA 945961962578559
- Margo Leick, PH.D.Walnut Creek, CA 945961811033806
Common questions
What is Katherine Louise Walker, PH.D.'s NPI number?
Katherine Louise Walker, PH.D.'s National Provider Identifier (NPI) is 1811055239, issued on Dec 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Louise Walker, PH.D. located?
The NPPES record lists a practice address at 710 S Broadway, Walnut Creek, CA, 94596. Phone: (925) 295-5466. Providers update this record themselves, so call before visiting.
How can I verify Katherine Louise Walker, PH.D.'s license?
NPPES lists California license number PSY15553, 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.