Lisa A. Williamson, RN, NP
Obstetrics & Gynecology Nurse Practitioner · Whittier, CA
Lisa A. Williamson, RN, NP is an obstetrics & gynecology nurse practitioner with a practice address in Whittier, California, and NPI 1841571908, issued on Sep 2, 2011. Check the license (California 20466, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Lisa A. Williamson
- Credential
- RN, NP
- Primary taxonomy
- Obstetrics & Gynecology Nurse Practitioner 363LX0001X
- License number
- 20466 CA
Self-reported in NPPES; status is on the state search - Practice location
- 14350 Whittier Blvd, Whittier, CA 90605
- Phone
- (562) 945-3707
- Enumerated
- Sep 2, 2011
- Record last updated
- Sep 2, 2011 (not updated in 15 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology nurse practitioner records → All 394 in California → Look up another NPI →
Also registered at 14350 Whittier Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Lisa A. 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 20466Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average obstetrics & gynecology nurse practitioner in 2024
31 Medicare Part D claims for 16 beneficiaries, against an average of 198 among the 1,094 providers of this specialty who prescribed in Part D. Brand-name drugs were 52% of 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.
Lisa A. Williamson among 394 obstetrics & gynecology nurse practitioner records in California
Lisa A. Williamson, RN, NP is one of 394 obstetrics & gynecology nurse practitioner records with a practice address in California. 38% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 73% of them.
- NPI issued2011 · 73% of these records are older, 24% newer
- In a Medicare fileYes · 38% of these records are
- In the CMS Doctors and Clinicians fileNo · 14% of these records are
- Record last updated2011 · 72% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LX0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Nurse Practitioner providers in California
There are 394 obstetrics & gynecology nurse practitioner records in California.
All 394 in California → Every provider in Whittier → Obstetrics & Gynecology Nurse Practitioner nationwide →
The 8 obstetrics & gynecology nurse practitioner records with the nearest ZIP codes
- Consuelo Zepeda, NPWhittier, CA 906051588829956
- Michelle Williamson, RN, NPWhittier, CA 906061508147661
- Maridel James, N.P.Whittier, CA 906021205097136
- Kelechi Irondi, NPCCypress, CA 906301376988725
- Veronica PrunaLa Habra, CA 906311700197449
- Deborah Jordan-Reed, N.P.Bellflower, CA 907061548276785
- Alexa Benson, N.P.Torrance, CA 905021497919526
- Danielle Naegle, RNP-C, MSNTorrance, CA 905021295729002
Common questions
What is Lisa A. Williamson, RN, NP's NPI number?
Lisa A. Williamson, RN, NP's National Provider Identifier (NPI) is 1841571908, issued on Sep 2, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Lisa A. Williamson, RN, NP located?
The NPPES record lists a practice address at 14350 Whittier Blvd, Whittier, CA, 90605. Phone: (562) 945-3707. Providers update this record themselves, so call before visiting.
How can I verify Lisa A. Williamson, RN, NP's license?
NPPES lists California license number 20466, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Lisa A. Williamson, RN, NP prescribe under Medicare Part D?
In 2024, Lisa A. Williamson, RN, NP had 31 Medicare Part D claims for 16 beneficiaries; the average among obstetrics & gynecology nurse practitioner prescribers was 198. 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.