Leah Williams, NP
NPI 1427125277 · Nurse Practitioner · Fontana, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Leah Williams, NP is a Nurse Practitioner provider in Fontana, CA (NPI 1427125277).
Provider details
- NPI number
- 1427125277
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- NP15198 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-29
- Last updated
- 2021-12-14
- Certified
- 2021-12-14
Frequently asked questions
- What is Leah Williams's NPI number?
- Leah Williams's National Provider Identifier (NPI) is 1427125277, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leah Williams's specialty?
- Leah Williams is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Leah Williams located?
- Leah Williams's practice location on file with NPPES is 9961 Sierra Ave, Fontana, CA 92335-6720.
- What is Leah Williams's phone number?
- The practice phone number listed in the NPPES registry for Leah Williams is (909) 427-3910.
- Does Leah Williams accept Medicare?
- Leah Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Leah Williams's NPI active?
- Yes — Leah Williams's NPI (1427125277) is active in the NPPES registry as of the last update on 2021-12-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.