Troy Williamson
Physician Assistant · Los Alamitos, CA
Troy Williamson is a physician assistant with a practice address in Los Alamitos, California, and NPI 1750166591, issued on Aug 29, 2023. Check the license (California PA63942, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Troy Williamson
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA63942 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3751 Katella Ave, Los Alamitos, CA 90720
- Phone
- (562) 598-1311
- Enumerated
- Aug 29, 2023
- Record last updated
- Jan 27, 2024
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 3751 Katella Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Monica Choi, MDAnesthesiology Physician1578804506
- Benjamin Cowan, MDDiagnostic Radiology Physician1760465728
Verify Troy Williamson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA63942Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average physician assistant in 2024
66 Medicare Part D claims for 45 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen11 claims
- Naloxone Hcl11 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.
Troy Williamson among 14,451 physician assistant records in California
Troy Williamson is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 80% of them.
- NPI issued2023 · 80% of these records are older, 13% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2024 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
29 physician assistant records list a practice address in Los Alamitos
They are 29 of the 1,035 NPPES records with a practice address in Los Alamitos, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Los Alamitos → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Katherine Beckwith, PA-CLos Alamitos, CA 907201710397930
- Nicholas Brecht, PA-CLos Alamitos, CA 907201205095205
- Leslie Davis, PALos Alamitos, CA 907201144395799
- Daniel Davis, PA-CLos Alamitos, CA 907201194173047
- Lauren Dolan, PA-CLos Alamitos, CA 907201700107091
- Anne Hall, PHYSICIAN ASSISTANTLos Alamitos, CA 907201699794081
- Yoonah LeeLos Alamitos, CA 907201538417415
- Heather Patz, PA-CLos Alamitos, CA 907201255573234
Common questions
What is Troy Williamson's NPI number?
Troy Williamson's National Provider Identifier (NPI) is 1750166591, issued on Aug 29, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Troy Williamson located?
The NPPES record lists a practice address at 3751 Katella Ave, Los Alamitos, CA, 90720. Phone: (562) 598-1311. Providers update this record themselves, so call before visiting.
How can I verify Troy Williamson's license?
NPPES lists California license number PA63942, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Troy Williamson prescribe under Medicare Part D?
In 2024, Troy Williamson had 66 Medicare Part D claims for 45 beneficiaries; the average among physician assistant prescribers was 830. 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.
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.