Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Diana Lynne Williams, FNP

Individual provider Family Nurse Practitioner · NPI 1174025886

Diana Lynne Williams, FNP is a Nurse Practitioner in Los Alamitos, California. Qualified in 2017, 9 years ago. Practices with Oneil Enterprises Inc, a 16-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
9
Licensed in
CA
In the registry since
2018
What do these letters mean?
FNP — Family Nurse Practitioner
A nurse practitioner who treats patients of all ages, much like a family doctor.

See every abbreviation used in this directory →

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Practice location Address checks out

4288 Katella Ave
Los Alamitos, CA 90720-3562
Phone: (562) 256-8514
Fax: (562) 296-8561
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 123 Atlantic Ave, Long Beach, CA 90802-5121 — (562) 726-1383
  • 4237 Atlantic Ave, Long Beach, CA 90807-2801 — (562) 336-1656

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence 95008594 (CA)

Record details

NPI number1174025886
Entity typeIndividual (Type 1)
GenderFemale
Credentials FNP
Sole proprietorNo
NPI enumeratedMarch 8, 2018
Last updated in NPPESApril 5, 2018

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2017 (9 years in practice)
Group practice Oneil Enterprises Inc — 16 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients15
Services billed 71 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Oneil Enterprises Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 16 clinicians in the practice; 11 are shown here.

Other providers in Los Alamitos