NANCY CHIAO-CASTLE
NPI 1578619052
Nurse Practitioner in San Mateo, CA

Q: What is Nancy Chiao-castle's NPI number?

The NPI number for Nancy Chiao-castle is 1578619052. It was assigned to this individual provider in the NPPES registry on January 26, 2007.

Q: What is Nancy Chiao-castle's specialty?

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

Active since January 26, 2007PECOS EnrolledAccepts Medicare Assignment

222 W 39TH AVE, SAN MATEO, CA 94403(650) 573-2222 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Nancy Chiao-castle NPPES

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

NANCY CHIAO-CASTLE (NPI 1578619052) is an individual nurse practitioner in San Mateo, California, licensed in California (RN245686) and active in the NPI registry since January 2007. She is enrolled in Medicare PECOS and is a graduate of Other (1999).

NPPES Registry Identity

NPI1578619052

Entity TypeIndividualFemale

Primary Taxonomy363L00000X

Provider Legal NameNANCY CHIAO-CASTLE

Location Address222 W 39TH AVESan Mateo, CA 94403-4364

Mailing Address25 W Avondale RdHillsborough, CA 94010-7180 · (650) 573-2222

Phone(650) 573-2222

Sole ProprietorNo

Medical School CMSOtherGraduated 1999

Enumeration DateJanuary 26, 2007

Last NPPES UpdateJuly 8, 2007

✔ NPI 1578619052 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 · RN245686

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.

222 W 39TH AVE, San Mateo, CA 94403

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Other Identifiers 1

Medicare UPINP93003CA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Nancy Chiao-castle is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3577552256

PECOS Enrollment IDI20040507001254

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 Reassignment

Medicare enrollment records show Nancy Chiao-castle reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

County Of San Mateo

Same address

Multi-Specialty

222 W 39TH AVE
San Mateo, CA 94403

Reassigned Medicare billing, California enrollment
Also billed through NPI 1114005105 (California)
430 clinicians in this Medicare group

NPI 1831268580 (650) 573-3702

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 94403 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

$104.51 typical visit price

range $69.00 – $202.35

Typical copayment $26.12 (range $17.25 – $50.58)

Most-billed visit code 99203

Established Patient

$119.48 typical visit price

range $23.44 – $166.46

Typical copayment $29.87 (range $5.86 – $41.61)

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.

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