William L. Matherly, LCSW
Clinical Social Worker · South San Francisco, CA
William L. Matherly, LCSW is a clinical social worker with a practice address in South San Francisco, California, and NPI 1063776011, issued on Jun 25, 2012. Check the license (California LCS28240, 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
- William L. Matherly
- Credential
- LCSW
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- License number
- LCS28240 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1200 EL Camino Real, South San Francisco, CA 94080
- Phone
- (650) 742-2151
- Enumerated
- Jun 25, 2012
- Record last updated
- Feb 11, 2022
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 36,261 in California → Look up another NPI →
Also registered at 1200 EL Camino Real
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William L. Matherly in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license LCS28240Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
William L. Matherly among 36,261 clinical social worker records in California
William L. Matherly, 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 not. Its NPI, issued in 2012, is newer than 38% of them.
- NPI issued2012 · 38% of these records are older, 58% newer
- In a Medicare fileNo · 6% of these records are
- In the CMS Doctors and Clinicians fileNo · 11% of these records are
- Record last updated2022 · 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).
27 clinical social worker records list a practice address in South San Francisco
They are 27 of the 1,173 NPPES records with a practice address in South San Francisco, and 36,261 clinical social worker records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 36,261 in California → Every provider in South San Francisco → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- William BrimmerSouth San Francisco, CA 940801225212269
- Megan BruceSouth San Francisco, CA 940801811398530
- Alina CazarezSouth San Francisco, CA 940801164893145
- Sara Graham, MSWSouth San Francisco, CA 940801538297247
- Marsha Guevara Aleman, LCSWSouth San Francisco, CA 940801356590434
- Eleanor Hertzler, LCSWSouth San Francisco, CA 940801417054214
- Cassandra Laterza, LCSWSouth San Francisco, CA 940801053569434
- Carrie Lee, LCSWSouth San Francisco, CA 940801447309513
Common questions
What is William L. Matherly, LCSW's NPI number?
William L. Matherly, LCSW's National Provider Identifier (NPI) is 1063776011, issued on Jun 25, 2012. An NPI identifies a provider in billing; it is not a license.
Where is William L. Matherly, LCSW located?
The NPPES record lists a practice address at 1200 EL Camino Real, South San Francisco, CA, 94080. Phone: (650) 742-2151. Providers update this record themselves, so call before visiting.
How can I verify William L. Matherly, LCSW's license?
NPPES lists California license number LCS28240, 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.