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ISABEL N SIERRA
NPI 1366100398
Marriage & Family Therapist in Crestline, CA

Active since December 07, 2021
340 CA-138, CRESTLINE, CA 92325(909) 336-3330 Get Directions Write a Review

NPPES record last updated: July 29, 2025. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Record update history: Mar 2, 2023, Feb 16, 2022, Dec 7, 2021 (3 updates tracked since 2021).

About Isabel N Sierra NPPES

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

ISABEL N SIERRA (NPI 1366100398) is an individual marriage & family therapist in Crestline, California, licensed in California (156441) and active in the NPI registry since December 2021.

NPPES Registry Identity

NPI1366100398
Entity TypeIndividualFemale
Primary Taxonomy106H00000X
Provider Legal NameISABEL N SIERRA
Location Address340 CA-138Crestline, CA 92325-9232
Mailing AddressPo Box 6232Crestline, CA 92325-6232 · (951) 397-8635
Phone(909) 336-3330
Sole ProprietorNo
Enumeration DateDecember 7, 2021
Last NPPES UpdateJuly 29, 20253 updates tracked since enumeration
NPPES CertifiedJuly 29, 2025
✔ NPI 1366100398 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyMarriage & Family TherapistBehavioral Health & Social Service Providers
Taxonomy Code106H00000X
License✔ Licensed in CA · 156441
Definition

A marriage and family therapist is a person with a master's degree in marriage and family therapy, or a master's or doctoral degree in a related mental health field with substantially equivalent coursework in marriage and family therapy, who receives supervised clinical experience, or a person who meets the state requirements to practice as a marriage and family therapist. A marriage and family therapist treats mental and emotional disorders within the context of marriage and family systems. A marriage and family therapist provides mental health and counseling services to individuals, couples, families, and groups.

Also ListedCase Manager/Care CoordinatorTaxonomy 171M00000X
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
340 CA-138, Crestline, CA 92325
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Other Providers at the Same Location NPPES 7

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

CARMEN CABRERA
Case Manager/Care Coordinator
340 CA-138
CRESTLINE, CA 92325
San Bernardino County (909) 336-3330
ADRIANA BUONOCORE
Student in an Organized Health Care Education/Training Program
340 CA-138
CRESTLINE, CA 92325
San Bernardino County (909) 336-3330
TIANNA WARREN
Student in an Organized Health Care Education/Training Program
340 CA-138
CRESTLINE, CA 92325
San Bernardino County (909) 336-3330
MRS. JENNIFER L THOMPSON
Counselor (Mental Health)
340 CA-138
CRESTLINE, CA 92325
San Bernardino County (909) 336-3330
MRS. MARIA G. LOPEZ-SOPHER BA
Student in an Organized Health Care Education/Training Program
340 CA-138
CRESTLINE, CA 92325
San Bernardino County (909) 273-7714
MR. DYLAN MCKELROY
Marriage & Family Therapist
340 CA-138
CRESTLINE, CA 92325
San Bernardino County (909) 698-7703
MEGAN FALLIS
Student in an Organized Health Care Education/Training Program
340 CA-138
CRESTLINE, CA 92325
San Bernardino County (909) 336-3330

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 Isabel Sierra's NPI number?

The NPI number for Isabel Sierra is 1366100398. It was assigned to this individual provider in the NPPES registry on December 7, 2021.

Where is Isabel Sierra located?

Isabel Sierra practices at 340 Ca-138, Crestline, CA 92325. The listed phone number is (909) 336-3330.

What is Isabel Sierra's specialty?

The primary specialty registered for this NPI is Marriage & Family Therapist with taxonomy code 106H00000X.

When was this NPI record last updated?

The NPPES record for Isabel Sierra was last updated on July 29, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.