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JANET WILLIAM NP
NPI 1821505587
Nurse Practitioner in Cerritos, CA

Active since January 03, 2018PECOS Enrolled
18000 STUDEBAKER RD STE 800, CERRITOS, CA 90703(562) 735-3226 Get Directions Write a Review

NPPES record last updated: May 12, 2020. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: May 12, 2020, Aug 28, 2018, Mar 17, 2018 (3 updates tracked since 2018).

About Janet William Np NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JANET WILLIAM NP (NPI 1821505587) is an individual nurse practitioner in Cerritos, California, licensed in California (NP95007086) and active in the NPI registry since January 2018. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1821505587
Entity TypeIndividualFemale
Primary Taxonomy363L00000X
Provider Legal NameJANET WILLIAMCredential: NP
Location Address18000 STUDEBAKER RD STE 800Cerritos, CA 90703
Mailing Address401 E Highland Ave, Ste CSan Bernardino, CA 92404-3834 · (562) 735-3226
Phone(562) 735-3226
Sole ProprietorYes
Enumeration DateJanuary 3, 2018
Last NPPES UpdateMay 12, 20203 updates tracked since enumeration
NPPES CertifiedMay 12, 2020
✔ NPI 1821505587 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363L00000X
License✔ Licensed in CA · NP95007086
Definition
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
18000 STUDEBAKER RD STE 800, Cerritos, CA 90703
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Janet William Np is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Janet William reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Faculty Physicians And Surgeons Of Llusm
21 mi
Transplant Surgery
1505 WILSON TERRACE, SUITE 155
Glendale, CA 91206
  • Reassigned Medicare billing, California enrollment
  • 2,584 clinicians in this Medicare group
NPI 1508255175 (909) 558-3636
Inland Hematology-Oncology Medical Group Inc
51 mi
Hematology & Oncology
401 E HIGHLAND AVE STE C
San Bernardino, CA 92404
  • Reassigned Medicare billing, California enrollment
  • 4 clinicians in this Medicare group
NPI 1467437848 (909) 886-6806

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90703 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ABHISHEK KUMAR MD
Radiology (Radiation Oncology)
18000 STUDEBAKER RD STE 800
CERRITOS, CA 90703
Los Angeles County (562) 735-3226
DR. ARLENE LEDESMA YU MD, MBA
Internal Medicine (Medical Oncology)
18000 STUDEBAKER RD STE 800
CERRITOS, CA 90703
Los Angeles County (562) 735-3226
JOSEPHINE ASSINI-STRUCK
Nurse Practitioner (Acute Care)
18000 STUDEBAKER RD STE 800
CERRITOS, CA 90703
Los Angeles County (562) 735-3226
MR. SAIFUDDIN TALIB FNP
Nurse Practitioner (Family)
18000 STUDEBAKER RD STE 800
CERRITOS, CA 90703
Los Angeles County (562) 735-3226
LOUIS SITHU
Nurse Practitioner (Primary Care)
18000 STUDEBAKER RD STE 800
CERRITOS, CA 90703
Los Angeles County (562) 735-3226
MS. ALICIA ANN ALEXANDER MS,PA-C
Physician Assistant
18000 STUDEBAKER RD STE 800
CERRITOS, CA 90703
Los Angeles County (562) 735-3226
JUAN E SANCHEZ MD
Internal Medicine (Hematology & Oncology)
18000 STUDEBAKER RD STE 800
CERRITOS, CA 90703
Los Angeles County (562) 735-3226
DR. WILBUR N MONTANA DO
Internal Medicine (Hematology & Oncology)
18000 STUDEBAKER RD STE 800
CERRITOS, CA 90703
Los Angeles County (562) 735-3226

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Janet William's NPI number?

The NPI number for Janet William is 1821505587. It was assigned to this individual provider in the NPPES registry on January 3, 2018.

Where is Janet William located?

Janet William practices at 18000 Studebaker Rd Ste 800, Cerritos, CA 90703. The listed phone number is (562) 735-3226.

What is Janet William's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Is Janet William enrolled in Medicare?

Yes. Janet William is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Janet William's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Janet William reassigns Medicare benefits to 2 organizations: Faculty Physicians And Surgeons Of Llusm (Glendale, CA) and Inland Hematology-Oncology Medical Group Inc (San Bernardino, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Janet William's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Janet William was last updated on May 12, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.