NPPES file of Aug 9, 2026

William Justin Carlson, LCSW

Clinical Social Worker · Stanford, CA

William Justin Carlson, LCSW is a clinical social worker with a practice address in Stanford, California, and NPI 1558843516, issued on Sep 5, 2018. Check the license (California 114624, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.

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

NPPES recordNPPES file of Aug 9, 2026
1558843516
Name
William Justin Carlson
Credential
LCSW
Primary taxonomy
Clinical Social Worker 1041C0700X
License number
114624 CA
Self-reported in NPPES; status is on the state search
Practice location
300 Pasteur Dr, Stanford, CA 94305
Phone
(650) 723-4000
Enumerated
Sep 5, 2018
Record last updated
Nov 15, 2024
Medicare enrollment
Enrolled (PECOS I20240920001224); accepts Medicare assignment
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 social worker records → All 36,261 in California → Look up another NPI →

Also registered at 300 Pasteur Dr

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

  1. Cooper Aakhus, MDEmergency Medicine Physician1194351007
  2. Oliver Aalami, M.D.Vascular Surgery Physician1225229024
  3. Alistair Aaronson, MDInternal Medicine Physician1457628760
  4. Sumaira Aasi, MDMOHS-Micrographic Surgery Physician1780675181
  5. Fahim Abbasi, M.D.Internal Medicine Physician1841484037
  6. Mohamad Abbass, MDNeurological Surgery Physician1679492151

Verify William Justin Carlson 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 114624    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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One hospital affiliation

  1. Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

William Justin Carlson among 36,261 clinical social worker records in California

William Justin Carlson, LCSW is one of 36,261 clinical social worker 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 2018, is newer than 62% of them.

  • NPI issued2018 · 62% of these records are older, 33% newer
  • In a Medicare fileYes · 6% of these records are
  • In the CMS Doctors and Clinicians fileYes · 11% of these records are
  • Graduated2020 · median 2012 among the 4,008 with a school on file
  • Record last updated2024 · 45% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1041C0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Clinical Social Worker providers in California

There are 36,261 clinical social worker records in California.

All 36,261 in California → Every provider in Stanford → Clinical Social Worker nationwide →

The 8 clinical social worker records with the nearest ZIP codes

  1. Tracy Chesler, LCSWPalo Alto, CA 943051881019586
  2. Jayme Frihart, LCSWStanford, CA 943051841665866
  3. Rosan Gomperts, LCSWStanford, CA 943051780912931
  4. Ashley Hartoch, LCSWStanford, CA 943051114413622
  5. Shawna Herbst, LCSWStanford, CA 943051295965325
  6. Madeleine Kannan, LCSWStanford, CA 943051063900017
  7. Sara Martinez, LCSWStanford, CA 943051396961603
  8. Albert Mezistrano, LCSWStanford, CA 943051295235406

Common questions

What is William Justin Carlson, LCSW's NPI number?

William Justin Carlson, LCSW's National Provider Identifier (NPI) is 1558843516, issued on Sep 5, 2018. An NPI identifies a provider in billing; it is not a license.

Where is William Justin Carlson, LCSW located?

The NPPES record lists a practice address at 300 Pasteur Dr, Stanford, CA, 94305. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.

How can I verify William Justin Carlson, LCSW's license?

NPPES lists California license number 114624, 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.

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.