NPPES file of Aug 9, 2026

Michael O'Brien, CADC II, NCAC I

Addiction (Substance Use Disorder) Counselor · Sonoma, CA

Michael O'Brien, CADC II, NCAC I is an addiction (substance use disorder) counselor with a practice address in Sonoma, California, and NPI 1295173854, issued on Jun 5, 2013. Check the license (California AII058830618, 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 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1295173854
Name
Michael O'Brien
Credential
CADC II, NCAC I
Primary taxonomy
Addiction (Substance Use Disorder) Counselor 101YA0400X
License number
AII058830618 CA
Self-reported in NPPES; status is on the state search
Practice location
977 W Napa St # 1029, Sonoma, CA 95476
Phone
(707) 812-2257
Enumerated
Jun 5, 2013
Record last updated
Apr 18, 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 →

Verify Michael O'Brien 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 AII058830618    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

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31 Medicare Part D claims are listed under this NPI for 2024

31 Medicare Part D claims. Brand-name drugs were 0% of claims.

CMS lists these Part D claims under this NPI, but the provider type reported to NPPES (addiction (substance use disorder) counselor) is not one that prescribes. The claims may be attributed to the wrong NPI in the CMS file, or the NPPES taxonomy may be out of date; PlainDoctor does not compare them with other providers.

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Michael O'Brien among 27,741 addiction (substance use disorder) counselor records in California

Michael O'Brien, CADC II, NCAC I 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. Its NPI, issued in 2013, is newer than 28% of them.

  • NPI issued2013 · 28% of these records are older, 69% newer
  • In a Medicare fileYes · 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.

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

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

  1. Cindy Chaed SuttonSonoma, CA 954761376292201
  2. Kellen GallagherSonoma, CA 954761518513084
  3. Lynette GreletSebastopol, CA 954721366306938
  4. Sue May, RASSebastopol, CA 954721770762072
  5. Michelle MontalbanoSebastopol, CA 954721184159451
  6. Amoria WebbSebastopol, CA 954721477362812
  7. Joseph CampbellUkiah, CA 954821134334881
  8. Delaine Cooke, CO508241617Ukiah, CA 954821255547865

Common questions

What is Michael O'Brien, CADC II, NCAC I's NPI number?

Michael O'Brien, CADC II, NCAC I's National Provider Identifier (NPI) is 1295173854, issued on Jun 5, 2013. An NPI identifies a provider in billing; it is not a license.

Where is Michael O'Brien, CADC II, NCAC I located?

The NPPES record lists a practice address at 977 W Napa St # 1029, Sonoma, CA, 95476. Phone: (707) 812-2257. Providers update this record themselves, so call before visiting.

How can I verify Michael O'Brien, CADC II, NCAC I's license?

NPPES lists California license number AII058830618, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

How much does Michael O'Brien, CADC II, NCAC I prescribe under Medicare Part D?

In 2024, Michael O'Brien, CADC II, NCAC I had 31 Medicare Part D claims; the average among addiction (substance use disorder) counselor prescribers was 175. Part D covers Medicare prescriptions 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.