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ROSEMARY S CASTILLO NP
NPI 1891854519
Nurse Practitioner in Glendora, CA

Active since December 08, 2006PECOS EnrolledAccepts Medicare Assignment
2025 E ROUTE 66, GLENDORA, CA 91740(626) 335-4610 Get Directions Write a Review

NPPES record last updated: December 7, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Rosemary S Castillo Np NPPES

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

ROSEMARY S CASTILLO NP (NPI 1891854519) is an individual nurse practitioner in Glendora, California, licensed in California (NP6156) and active in the NPI registry since December 2006. She is enrolled in Medicare PECOS, maintains a secondary practice location in Bellflower, and is a graduate of Other (1992).

NPPES Registry Identity

NPI1891854519
Entity TypeIndividualFemale
Primary Taxonomy363L00000X
Provider Legal NameROSEMARY S CASTILLOCredential: NP
Location Address2025 E ROUTE 66Glendora, CA 91740-4670
Mailing AddressPo Box 35380Las Vegas, NV 89133-5380 · (702) 579-3203
Phone(626) 335-4610
Sole ProprietorNo
Medical School CMSOtherGraduated 1992
Enumeration DateDecember 8, 2006
Last NPPES UpdateDecember 7, 2025
NPPES CertifiedDecember 7, 2025
✔ NPI 1891854519 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 · NP6156
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.
2025 E ROUTE 66, Glendora, CA 91740
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Secondary Practice Location 1

Location 19400 Rosecrans AveBellflower, CA 90706-2246 · Phone (562) 461-3000

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

Rosemary S Castillo Np 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 ID5092858274
PECOS Enrollment IDI20100210000575
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 Rosemary Castillo reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Pih Health Physicians
11 mi
Interventional Cardiology
685 N 13TH AVE STE 9
Upland, CA 91786
  • Reassigned Medicare billing, California enrollment
  • 840 clinicians in this Medicare group
NPI 1437815313 (909) 949-3977
Healthcare Partners Affiliates Medical Group
27 mi
Internal Medicine
1120 W WASHINGTON BLVD
Los Angeles, CA 90015
  • Reassigned Medicare billing, California enrollment
  • 2,052 clinicians in this Medicare group
NPI 1659312593 (213) 623-2225

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 91740 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 14

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

HEALTH CARE PARTNERS, INC.
Non-Pharmacy Dispensing Site
2025 E ROUTE 66
GLENDORA, CA 91740
Los Angeles County (626) 335-4610
DR. FLORENCE CAPPLEMAN MD
Family Medicine
2025 E ROUTE 66
GLENDORA, CA 91740
Los Angeles County (626) 963-3682
MS. VALEDA K LIMLAHAPAN NP
Nurse Practitioner (Family)
2025 E ROUTE 66
GLENDORA, CA 91740
Los Angeles County (626) 335-4610
LISA H KIMPARK M.D.
Pediatrics
2025 E ROUTE 66
GLENDORA, CA 91740
Los Angeles County (626) 963-3681
COURTLEY YAN PA-C
Physician Assistant
2025 E ROUTE 66
GLENDORA, CA 91740
Los Angeles County (626) 334-4610
GLORIA THERESA YEE M.D.
Family Medicine
2025 E ROUTE 66
GLENDORA, CA 91740
Los Angeles County (626) 963-3683
DR. IHSAN HAKIMEH MD
Internal Medicine
2025 E ROUTE 66
GLENDORA, CA 91740
Los Angeles County (626) 852-4923
JOVI CACNIO
Pediatrics
2025 E ROUTE 66
GLENDORA, CA 91740
Los Angeles County (626) 963-3681

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 Rosemary Castillo's NPI number?

The NPI number for Rosemary Castillo is 1891854519. It was assigned to this individual provider in the NPPES registry on December 8, 2006.

Where is Rosemary Castillo located?

Rosemary Castillo practices at 2025 E Route 66, Glendora, CA 91740. The listed phone number is (626) 335-4610.

What is Rosemary Castillo's specialty?

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

Is Rosemary Castillo enrolled in Medicare?

Yes. Rosemary Castillo is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Rosemary Castillo's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Rosemary Castillo reassigns Medicare benefits to 2 organizations: Pih Health Physicians (Upland, CA) and Healthcare Partners Affiliates Medical Group (Los Angeles, 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 Rosemary Castillo'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 Rosemary Castillo was last updated on December 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months 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.