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

Q: 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.

Q: What is Isabel Sierra's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Isabel Sierra was last updated on July 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.

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: August 09, 2026.

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

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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.

MRS. JENNIFER L THOMPSON

Counselor (Mental Health)