MR. WILLIAM JEFFERSON M.A.
NPI 1659419455
Marriage & Family Therapist in Gilbert, AZ

Q: What is William Jefferson's NPI number?

The NPI number for William Jefferson is 1659419455. It was assigned to this individual provider in the NPPES registry on February 2, 2007.

Q: What is William Jefferson'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 William Jefferson was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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 February 02, 2007

1150 N SAILORS WAY, GILBERT, AZ 85234(480) 632-0276 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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About Mr. William Jefferson M.a. NPPES

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

MR. WILLIAM JEFFERSON M.A. (NPI 1659419455) is an individual marriage & family therapist in Gilbert, Arizona, licensed in Arizona (LMFT 0065) and active in the NPI registry since February 2007.

NPPES Registry Identity

NPI1659419455

Entity TypeIndividualMale

Primary Taxonomy106H00000X

Provider Legal NameMR. WILLIAM JEFFERSONCredential: M.A.

Location Address1150 N SAILORS WAYGilbert, AZ 85234-3612

Mailing Address1150 N Sailors WayGilbert, AZ 85234-3612 · (480) 632-0276

Phone(480) 632-0276

Sole ProprietorYes

Enumeration DateFebruary 2, 2007

Last NPPES UpdateSeptember 11, 2025

✔ NPI 1659419455 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyMarriage & Family TherapistBehavioral Health & Social Service Providers

Taxonomy Code106H00000X

License✔ Licensed in AZ · LMFT 0065

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 ListedCounselor · ProfessionalTaxonomy 101YP2500X · License LPC 0229 (AZ)

1150 N SAILORS WAY, Gilbert, AZ 85234

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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 William Jefferson's NPI number?

The NPI number for William Jefferson is 1659419455. It was assigned to this individual provider in the NPPES registry on February 2, 2007.

Where is William Jefferson located?

William Jefferson practices at 1150 N Sailors Way, Gilbert, AZ 85234. The listed phone number is (480) 632-0276.

What is William Jefferson'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 William Jefferson was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.