NPPES file of Aug 9, 2026

Michael Jerome O'Neill, LCSW

Clinical Social Worker · Greenbrae, CA

Michael Jerome O'Neill, LCSW is a clinical social worker with a practice address in Greenbrae, California, and NPI 1225431349, issued on Oct 2, 2014. Check the license (California LCSW130166, 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
1225431349
Name
Michael Jerome O'Neill
Credential
LCSW
Primary taxonomy
Clinical Social Worker 1041C0700X
License numbers
LCSW130166 CA
130166 CA
Self-reported in NPPES; status is on the state search
Practice location
250 Bon Air RD Unit B, Greenbrae, CA 94904
Phone
(415) 473-6829
Enumerated
Oct 2, 2014
Record last updated
Aug 4, 2025
Fax
(415) 473-4113
Medicare enrollment
Enrolled (PECOS I20250612003507); 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 250 Bon Air RD Unit B

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

  1. Joel BoveyClinical Social Worker1295135382
  2. Marcnita DonatienStudent in an Organized Health Care Education/Training Program1225914906
  3. Emmanuel EzealaRegistered Nurse1487164653
  4. Cheryl FedeleRegistered Nurse1588181614
  5. Ruth GalvanPeer Specialist1013676808
  6. Katherine Hargitt, PSYDClinical Psychologist1407936685

Verify Michael Jerome O'Neill 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 LCSW130166    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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Bills Medicare through one group practice

  1. City And County OF San FranciscoSan Francisco, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Michael Jerome O'Neill among 36,261 clinical social worker records in California

Michael Jerome O'Neill, 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 2014, is newer than 45% of them.

  • NPI issued2014 · 45% of these records are older, 51% newer
  • In a Medicare fileYes · 6% of these records are
  • In the CMS Doctors and Clinicians fileYes · 11% of these records are
  • Graduated2019 · median 2012 among the 4,008 with a school on file
  • Record last updated2025 · 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).

35 clinical social worker records list a practice address in Greenbrae

They are 35 of the 727 NPPES records with a practice address in Greenbrae, and 36,261 clinical social worker records in California.

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

The 8 clinical social worker records with the nearest ZIP codes

  1. Leora Barzell-Weber, LCSWGreenbrae, CA 949041326118399
  2. Austin Brink, LCSWGreenbrae, CA 949041366539850
  3. Marcella Brink, PH.D.Greenbrae, CA 949041477765998
  4. Kathy Chestnut, LCSWGreenbrae, CA 949041063509560
  5. Lawrence Cunniffe, L.C.S.W.Greenbrae, CA 949041295835106
  6. Kathleen DevittGreenbrae, CA 949041578699492
  7. Ilene Dillon, M.S.W.Kentfield, CA 949041932245701
  8. Samantha Fargeon, LCSWGreenbrae, CA 949041770791931

Common questions

What is Michael Jerome O'Neill, LCSW's NPI number?

Michael Jerome O'Neill, LCSW's National Provider Identifier (NPI) is 1225431349, issued on Oct 2, 2014. An NPI identifies a provider in billing; it is not a license.

Where is Michael Jerome O'Neill, LCSW located?

The NPPES record lists a practice address at 250 Bon Air RD Unit B, Greenbrae, CA, 94904. Phone: (415) 473-6829. Providers update this record themselves, so call before visiting.

How can I verify Michael Jerome O'Neill, LCSW's license?

NPPES lists California license number LCSW130166, 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.