NPPES file of Aug 9, 2026

Joy Stephenson Kolker, PHD

Clinical Psychologist · Santa Rosa, CA

Joy Stephenson Kolker, PHD is a clinical psychologist with a practice address in Santa Rosa, California, and NPI 1508162686, issued on Feb 7, 2011. Check the license (California 23656, 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.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1508162686
Name
Joy Stephenson Kolker
Credential
PHD
Primary taxonomy
Clinical Psychologist 103TC0700X
License number
23656 CA
Self-reported in NPPES; status is on the state search
Practice location
818 Cherry St, Santa Rosa, CA 95404
Phone
(707) 257-7900
Enumerated
Feb 7, 2011
Record last updated
Dec 9, 2015 (not updated in 11 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20120523000747); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest clinical psychologist records → All 12,647 in California → Look up another NPI →

Also registered at 818 Cherry St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Dinah Bachrach, M.F.T.Marriage & Family Therapist1437359577
  2. Erin ClintonMarriage & Family Therapist1538612254
  3. Lisa GraceMarriage & Family Therapist1801914239
  4. Jessica Malmberg, LMFTMarriage & Family Therapist1275051898
  5. Cynthia Morrow, LMFTMarriage & Family Therapist1952282493

Verify Joy Stephenson Kolker in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license 23656    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Joy Stephenson Kolker among 12,647 clinical psychologist records in California

Joy Stephenson Kolker, PHD 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 not. Its NPI, issued in 2011, is newer than 59% of them.

  • NPI issued2011 · 59% of these records are older, 37% newer
  • In a Medicare fileNo · 9% of these records are
  • In the CMS Doctors and Clinicians fileYes · 19% of these records are
  • Graduated2008 · median 2006 among the 2,424 with a school on file
  • Record last updated2015 · 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).

102 clinical psychologist records list a practice address in Santa Rosa

They are 102 of the 6,884 NPPES records with a practice address in Santa Rosa, and 12,647 clinical psychologist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 12,647 in California → Every provider in Santa Rosa → Clinical Psychologist nationwide →

The 8 clinical psychologist records with the nearest ZIP codes

  1. Ralph Ames, PHDSanta Rosa, CA 954041205994464
  2. Catherine Bayer, PHDSanta Rosa, CA 954041932195765
  3. Deborah Chiddix, PSY.D.Santa Rosa, CA 954041043389000
  4. Virginia Crossleysmith, PSYDSanta Rosa, CA 954041538130356
  5. Kelley Dolan, PH.D.Santa Rosa, CA 954041144239336
  6. Lisa Grossman, PH.D.Santa Rosa, CA 954041215994199
  7. Laurie Herr, PSYDSanta Rosa, CA 954041760551204
  8. Mary Lague, PSYCHOLOGIST PSY DSanta Rosa, CA 954041215962592

Common questions

What is Joy Stephenson Kolker, PHD's NPI number?

Joy Stephenson Kolker, PHD's National Provider Identifier (NPI) is 1508162686, issued on Feb 7, 2011. An NPI identifies a provider in billing; it is not a license.

Where is Joy Stephenson Kolker, PHD located?

The NPPES record lists a practice address at 818 Cherry St, Santa Rosa, CA, 95404. Phone: (707) 257-7900. Providers update this record themselves, so call before visiting.

How can I verify Joy Stephenson Kolker, PHD's license?

NPPES lists California license number 23656, 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.