Quick answers
- Where does Lionel Williamson see patients?
- Medicare's clinician data lists 2 practice locations, including Mariposa, CA and Fair Oaks, CA. Call before your visit to confirm the address.
- What is Lionel Williamson's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Lionel Williamson accept Medicare assignment?
- Yes. Medicare's clinician data says Lionel Williamson accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Lionel Williamson?
- (209) 966-2344, as listed in official Medicare / NPI Registry data.
- What is Lionel Williamson's NPI number?
- 1881996445. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Lionel Williamson is enrolled with Medicare (CMS data updated 2026-10-02).
- 5320 Hwy 49 N, Suite 1 3Mariposa, CA 95338 (209) 966‑2344
- 6608 Mercy Ct, Suite BFair Oaks, CA 95628 (916) 241‑9844
Group practices
Medicare enrollment lists Lionel Williamson as a member of this group (CMS data updated 2026-10-02).
- Community Health Centers of America117 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Mariposa
Clinicians with the same Medicare primary specialty in Mariposa, CA — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1881996445 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians