NPPES file of Aug 9, 2026

Michael Williamson, RADT

Addiction (Substance Use Disorder) Counselor · Los Gatos, CA

Michael Williamson, RADT is an addiction (substance use disorder) counselor with a practice address in Los Gatos, California, and NPI 1487401154, issued on May 1, 2024. Check the license (California R1545910124, 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
1487401154
Name
Michael Williamson
Credential
RADT
Primary taxonomy
Addiction (Substance Use Disorder) Counselor 101YA0400X
License number
R1545910124 CA
Self-reported in NPPES; status is on the state search
Practice location
16400 Lark Ave, Los Gatos, CA 95032
Phone
(720) 539-3003
Enumerated
May 1, 2024
Record last updated
May 1, 2024
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest addiction (substance use disorder) counselor records → All 27,741 in California → Look up another NPI →

Also registered at 16400 Lark Ave

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

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  2. Esther Chen, M.D.Family Medicine Physician1568784478
  3. Ali Moayed, MDUrology Physician1124126503
  4. Loree Pinnavaia, D.C.Orthopedic Chiropractor1699071563
  5. Mark Rindge, DDSDentist1831229392
  6. Farzaneh Tabrizi, MDFamily Medicine Physician1194826909

Verify Michael Williamson 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 R1545910124    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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Michael Williamson among 27,741 addiction (substance use disorder) counselor records in California

Michael Williamson, RADT is one of 27,741 addiction (substance use disorder) counselor records with a practice address in California. under 1% 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 2024, is newer than 82% of them.

  • NPI issued2024 · 82% of these records are older, 10% newer
  • In a Medicare fileNo · under 1% of these records are
  • In the CMS Doctors and Clinicians fileNo · under 1% of these records are
  • Record last updated2024 · 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 101YA0400X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Addiction (Substance Use Disorder) Counselor providers in California

There are 27,741 addiction (substance use disorder) counselor records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 27,741 in California → Every provider in Los Gatos → Addiction (Substance Use Disorder) Counselor nationwide →

The 8 addiction (substance use disorder) counselor records with the nearest ZIP codes

  1. Katie Conway, CADC II, ICADCLos Gatos, CA 950321447013818
  2. Steven Reinhart-Odgers, RADT R1425850421Los Gatos, CA 950321154181840
  3. Charles MurrayGilroy, CA 950301841500436
  4. Timothy Van Den Berg, RADTLos Gatos, CA 950301407669278
  5. Donna VorstLos Gatos, CA 950301831902501
  6. Elizabeth MooreMilpitas, CA 950351508982661
  7. Anthony BoykinsMorgan Hill, CA 950371710243928
  8. Jeffrey ButronMorgan Hill, CA 950371306114517

Common questions

What is Michael Williamson, RADT's NPI number?

Michael Williamson, RADT's National Provider Identifier (NPI) is 1487401154, issued on May 1, 2024. An NPI identifies a provider in billing; it is not a license.

Where is Michael Williamson, RADT located?

The NPPES record lists a practice address at 16400 Lark Ave, Los Gatos, CA, 95032. Phone: (720) 539-3003. Providers update this record themselves, so call before visiting.

How can I verify Michael Williamson, RADT's license?

NPPES lists California license number R1545910124, 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.