1. Home
  2. Directory
  3. California
  4. San Ysidro
  5. Social Worker
  6. NPI Profile

MARGARITA CASTELLANOS PALAZUELOS
NPI 1104379791
Social Worker - Clinical in San Ysidro, CA

Active since July 29, 2016PECOS Enrolled
1666 PRECISION PARK LN, SAN YSIDRO, CA 92173(619) 428-5533(619) 785-3390 Get Directions Write a Review

NPPES record last updated: April 29, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Apr 29, 2026, Aug 15, 2023, Sep 13, 2022 (3 updates tracked since 2022).

About Margarita Castellanos Palazuelos NPPES

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

MARGARITA CASTELLANOS PALAZUELOS (NPI 1104379791) is an individual clinical provider in San Ysidro, California, licensed in California (1377031) and active in the NPI registry since July 2016. She is enrolled in Medicare PECOS and is a graduate of Other (2023).

NPPES Registry Identity

NPI1104379791
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameMARGARITA CASTELLANOS PALAZUELOS
Location Address1666 PRECISION PARK LNSan Ysidro, CA 92173-1346
Mailing Address1666 Precision Park LnSan Ysidro, CA 92173-1346 · (619) 428-5533 · Fax (619) 785-3390
Phone(619) 428-5533
Fax(619) 785-3390
Sole ProprietorNo
Medical School CMSOtherGraduated 2023
Enumeration DateJuly 29, 2016
Last NPPES UpdateApril 29, 20263 updates tracked since enumeration
NPPES CertifiedApril 29, 2026
✔ NPI 1104379791 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in CA · 1377031
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
1666 PRECISION PARK LN, San Ysidro, CA 92173
Open in Google Maps ↗

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Margarita Castellanos Palazuelos is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID2264901743
PECOS Enrollment IDI20260513003820
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 Margarita Castellanos Palazuelos reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Centro De Salud De La Comunidad De San Ysidro, Inc.
Same address
Federally Qualified Health Center (FQHC)
1666 PRECISION PARK LN
San Diego, CA 92173
  • Reassigned Medicare billing, California enrollment
  • 577 clinicians in this Medicare group
NPI 1124782685 (619) 662-4100

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 92173 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
$0.00 typical visit price
range $62.10 – $184.71
Typical copayment $0.00 (range $15.52 – $46.17)
Most-billed visit code NA
Established Patient
$76.87 typical visit price
range $20.62 – $151.42
Typical copayment $19.21 (range $5.15 – $37.85)
Most-billed visit code 99213
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.

CENTRO DE SALUD DE LA COMUNIDAD DE SAN YSIDRO, INC.
Clinic/Center (Adolescent and Children Mental Health)
1666 PRECISION PARK LN
SAN DIEGO, CA 92173
San Diego County (619) 428-1330
MS. GRACIELA CASTELLANOS MA IN MFT
Counselor
1666 PRECISION PARK LN
SAN YSIDRO, CA 92173
San Diego County (619) 662-4100
MICHELLE STEPHANIE LOUGH
Family Medicine
1666 PRECISION PARK LN
SAN YSIDRO, CA 92173
San Diego County (619) 662-4100
ARI AZANI
Psychiatry & Neurology (Child & Adolescent Psychiatry)
1666 PRECISION PARK LN
SAN YSIDRO, CA 92173
San Diego County (619) 662-4100
RITO A LOPEZ NURSE PRACTITIONER
Nurse Practitioner (Family)
1666 PRECISION PARK LN
SAN YSIDRO, CA 92173
San Diego County (619) 662-4100
CENTRO DE SALUD DE LA COMUNIDAD DE SAN YSIDRO, INC.
Clinic/Center (Federally Qualified Health Center (FQHC))
1666 PRECISION PARK LN
SAN DIEGO, CA 92173
San Diego County (619) 662-4100
THANOS GEORGE ROSSOPOULOS MD
Psychiatry & Neurology (Psychiatry)
1666 PRECISION PARK LN
SAN YSIDRO, CA 92173
San Diego County (619) 662-4100
IRAIDA REYNOSO
Marriage & Family Therapist
1666 PRECISION PARK LN
SAN DIEGO, CA 92173
San Diego County (619) 662-4100

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 Margarita Castellanos Palazuelos's NPI number?

The NPI number for Margarita Castellanos Palazuelos is 1104379791. It was assigned to this individual provider in the NPPES registry on July 29, 2016.

Where is Margarita Castellanos Palazuelos located?

Margarita Castellanos Palazuelos practices at 1666 Precision Park Ln, San Ysidro, CA 92173. The listed phone number is (619) 428-5533.

What is Margarita Castellanos Palazuelos's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Is Margarita Castellanos Palazuelos enrolled in Medicare?

Yes. Margarita Castellanos Palazuelos is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Margarita Castellanos Palazuelos's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Margarita Castellanos Palazuelos reassigns Medicare benefits to Centro De Salud De La Comunidad De San Ysidro, Inc. (San Diego, CA). The 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 Margarita Castellanos Palazuelos'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 Margarita Castellanos Palazuelos was last updated on April 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.