Lionel Williamson, FNP
Family Nurse Practitioner · Sacramento, CA
Lionel Williamson, FNP is a family nurse practitioner with a practice address in Sacramento, California, and NPI 1881996445, issued on Dec 2, 2010. Check the license (California 20422, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Lionel Williamson
- Credential
- FNP
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- 20422 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8325 Elk Grove Florin RD Ste 800, Sacramento, CA 95829
- Phone
- (916) 226-6190
- Enumerated
- Dec 2, 2010
- Record last updated
- Sep 4, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (916) 689-5038
- Medicare enrollment
- Enrolled (PECOS I20131106002011); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 16,966 in California → Look up another NPI →
Verify Lionel 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 20422Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% more Medicare Part D claims than the average family nurse practitioner in 2024
1,357 Medicare Part D claims for 163 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims. 179 claims were for opioids.
Most prescribed
- Dextrose In Water84 claims
- Hydrocodone-Acetaminophen66 claims
- Furosemide63 claims
- Amlodipine Besylate48 claims
- Oxycodone Hcl39 claims
- Sodium Chloride36 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
- Community Health Centers OF AmericaMariposa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Lionel Williamson among 16,966 family nurse practitioner records in California
Lionel Williamson, FNP is one of 16,966 family nurse practitioner records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 17% of them.
- NPI issued2010 · 17% of these records are older, 81% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 40% of these records are
- Graduated2010 · median 2019 among the 6,793 with a school on file
- Record last updated2018 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
444 family nurse practitioner records list a practice address in Sacramento
They are 444 of the 33,083 NPPES records with a practice address in Sacramento, and 16,966 family nurse practitioner records in California.
All 16,966 in California → Every provider in Sacramento → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Chioma IhediohaSacramento, CA 958291821962689
- Bernadette Letsa, NPSacramento, CA 958291023780822
- Iris AcostaSacramento, CA 958281942527445
- Gurpreet Gill, NPSacramento, CA 958281669330049
- Mai VangSacramento, CA 958281992675870
- Samantha Chu, FNP-BCSacramento, CA 958311588108708
- Rosemarie Co, NURSE PRACTITIONERSacramento, CA 958271730883802
- Dione Cole, ACNP-BC, FNP-BCSacramento, CA 958271417200684
Common questions
What is Lionel Williamson, FNP's NPI number?
Lionel Williamson, FNP's National Provider Identifier (NPI) is 1881996445, issued on Dec 2, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Lionel Williamson, FNP located?
The NPPES record lists a practice address at 8325 Elk Grove Florin RD Ste 800, Sacramento, CA, 95829. Phone: (916) 226-6190. Providers update this record themselves, so call before visiting.
How can I verify Lionel Williamson, FNP's license?
NPPES lists California license number 20422, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Lionel Williamson, FNP prescribe under Medicare Part D?
In 2024, Lionel Williamson, FNP had 1,357 Medicare Part D claims for 163 beneficiaries; the average among family nurse practitioner prescribers was 1,305. 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.