NPPES file of Aug 9, 2026

Douglas Logan Williamson, DNP

Psychiatric/Mental Health Registered Nurse · San Luis Obispo, CA

Douglas Logan Williamson, DNP is a psychiatric/mental health registered nurse with a practice address in San Luis Obispo, California, and NPI 1386240844, issued on Dec 9, 2020. Check the license (California NP95016180, 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
1386240844
Name
Douglas Logan Williamson
Credential
DNP
Primary taxonomy
Psychiatric/Mental Health Registered Nurse 163WP0808X
License number
NP95016180 CA
Self-reported in NPPES; status is on the state search
Practice location
1304 Ella St Ste B, San Luis Obispo, CA 93401
Phone
(805) 541-6000
Enumerated
Dec 9, 2020
Record last updated
Mar 20, 2025
Fax
(805) 541-6001
Medicare enrollment
Enrolled (PECOS I20210127002643); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
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 psychiatric/mental health registered nurse records → All 2,568 in California → Look up another NPI →

Also registered at 1304 Ella St Ste B

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

  1. Richard Altesman, MDPsychiatry Physician1730292350
  2. Katie Bailey, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1790359917
  3. Julia Davison, PA-CPhysician Assistant1235116955
  4. Allyson Gelman, PA-CMedical Physician Assistant1972901809
  5. Douglas Murphy, MDChild & Adolescent Psychiatry Physician1700953734

Verify Douglas Logan 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 NP95016180    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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37% fewer Medicare Part D claims than the average psychiatric/mental health registered nurse in 2024

557 Medicare Part D claims for 39 beneficiaries, against an average of 888 among the 242 providers of this specialty who prescribed in Part D.

  1. Douglas Williamson557
  2. Specialty average888

Most prescribed

  1. Lamotrigine59 claims
  2. Bupropion Xl54 claims
  3. Trazodone Hcl52 claims
  4. Escitalopram Oxalate39 claims
  5. Duloxetine Hcl38 claims
  6. Lurasidone Hcl33 claims

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.

Bills Medicare through one group practice

  1. Pacific Psychiatry Inc., A Professional Medical CorporationSan Luis Obispo, CA

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

Douglas Logan Williamson among 2,568 psychiatric/mental health registered nurse records in California

Douglas Logan Williamson, DNP is one of 2,568 psychiatric/mental health registered nurse records with a practice address in California. 2% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 57% of them.

  • NPI issued2020 · 57% of these records are older, 39% newer
  • In a Medicare fileYes · 2% of these records are
  • In the CMS Doctors and Clinicians fileYes · under 1% of these records are
  • Graduated2020 · median 2023 among the 20 with a school on file
  • Record last updated2025 · 60% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 163WP0808X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Psychiatric/Mental Health Registered Nurse providers in California

There are 2,568 psychiatric/mental health registered nurse records in California.

All 2,568 in California → Every provider in San Luis Obispo → Psychiatric/Mental Health Registered Nurse nationwide →

The 8 psychiatric/mental health registered nurse records with the nearest ZIP codes

  1. Angela Atwell, R.N.San Luis Obispo, CA 934011730470154
  2. Mary Benson, RNSan Luis Obispo, CA 934011013196112
  3. Mark BishopSan Luis Obispo, CA 934011225196579
  4. Patrick Cady, R.N.San Luis Obispo, CA 934011255670808
  5. Emily CarySan Luis Obispo, CA 934011992129498
  6. Federico Castillo, R.N.San Luis Obispo, CA 934011043502636
  7. Darla HendersonSan Luis Obispo, CA 934011659820900
  8. Diane Huettner, RNSan Luis Obispo, CA 934011497039671

Common questions

What is Douglas Logan Williamson, DNP's NPI number?

Douglas Logan Williamson, DNP's National Provider Identifier (NPI) is 1386240844, issued on Dec 9, 2020. An NPI identifies a provider in billing; it is not a license.

Where is Douglas Logan Williamson, DNP located?

The NPPES record lists a practice address at 1304 Ella St Ste B, San Luis Obispo, CA, 93401. Phone: (805) 541-6000. Providers update this record themselves, so call before visiting.

How can I verify Douglas Logan Williamson, DNP's license?

NPPES lists California license number NP95016180, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

How much does Douglas Logan Williamson, DNP prescribe under Medicare Part D?

In 2024, Douglas Logan Williamson, DNP had 557 Medicare Part D claims for 39 beneficiaries; the average among psychiatric/mental health registered nurse prescribers was 888. 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.