Janet William, NP
NPI 1821505587 · Nurse Practitioner · Cerritos, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Janet William, NP is a Nurse Practitioner provider in Cerritos, CA (NPI 1821505587).
Provider details
- NPI number
- 1821505587
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- Yes
- License
- NP95007086 (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 tenure33% of score
8 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 78 | 22 |
| Anastrozole | 58 | 22 |
| Ondansetronbrand: Ondansetron Odt | 22 | 12 |
| Fentanyl | 21 | — |
| Hydroxyurea | 20 | — |
| Prednisone | 19 | — |
| Oxycodone Hcl | 19 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$5,490 across 221 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-01-03
- Last updated
- 2020-05-12
- Certified
- 2020-05-12
Frequently asked questions
- What is Janet William's NPI number?
- Janet William's National Provider Identifier (NPI) is 1821505587, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Janet William's specialty?
- Janet William is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Janet William located?
- Janet William's practice location on file with NPPES is 18000 Studebaker Rd Ste 800, Cerritos, CA 90703.
- What is Janet William's phone number?
- The practice phone number listed in the NPPES registry for Janet William is (562) 735-3226.
- Does Janet William accept Medicare?
- Janet William is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Janet William's NPI active?
- Yes — Janet William's NPI (1821505587) is active in the NPPES registry as of the last update on 2020-05-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.