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MARK GLENN WILLOUGHBY
NPI 1174038756
Counselor - Addiction (Substance Use Disorder) in El Monte, CA

Active since December 05, 2017
3430 COGSWELL RD, EL MONTE, CA 91732(626) 453-3400 Get Directions Write a Review

NPPES record last updated: December 5, 2017. Verified against the NPPES registry weekly; last sync: July 19, 2026.

About Mark Glenn Willoughby NPPES

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

MARK GLENN WILLOUGHBY (NPI 1174038756) is an individual addiction (substance use disorder) provider in El Monte, California and active in the NPI registry since December 2017.

NPPES Registry Identity

NPI1174038756
Entity TypeIndividualMale
Primary Taxonomy101YA0400X
Provider Legal NameMARK GLENN WILLOUGHBY
Location Address3430 COGSWELL RDEl Monte, CA 91732-2785
Mailing Address3430 Cogswell RdEl Monte, CA 91732-2785
Phone(626) 453-3400
Sole ProprietorNo
Enumeration DateDecember 5, 2017
✔ NPI 1174038756 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Addiction (Substance Use Disorder)Behavioral Health & Social Service Providers
Taxonomy Code101YA0400X
3430 COGSWELL RD, El Monte, CA 91732
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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.

NANCY A JIMENEZ
Counselor (Addiction (Substance Use Disorder))
3430 COGSWELL RD
EL MONTE, CA 91732
Los Angeles County (626) 453-3400
WAYNE VILLESCA
Case Manager/Care Coordinator
3430 COGSWELL RD
EL MONTE, CA 91732
Los Angeles County (626) 453-3400
ARLENE LUNA
Counselor (Addiction (Substance Use Disorder))
3430 COGSWELL RD
EL MONTE, CA 91732
Los Angeles County (626) 453-3400
LARISSA JONES
Counselor (Addiction (Substance Use Disorder))
3430 COGSWELL RD
EL MONTE, CA 91732
Los Angeles County (626) 453-3400
MRS. MONIQUE RENE SCHULTE CADC-CAS
Counselor (Addiction (Substance Use Disorder))
3430 COGSWELL RD
EL MONTE, CA 91732
Los Angeles County (626) 453-3400
MR. SCOTT BOELMAN
Counselor (Addiction (Substance Use Disorder))
3430 COGSWELL RD
EL MONTE, CA 91732
Los Angeles County (626) 453-3400
TANIA AGUILERA
Counselor (Addiction (Substance Use Disorder))
3430 COGSWELL RD
EL MONTE, CA 91732
Los Angeles County (626) 453-3421
MR. JAVIER TORRES
Counselor (Addiction (Substance Use Disorder))
3430 COGSWELL RD
EL MONTE, CA 91732
Los Angeles County (626) 453-3406

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 Mark Willoughby's NPI number?

The NPI number for Mark Willoughby is 1174038756. It was assigned to this individual provider in the NPPES registry on December 5, 2017.

Where is Mark Willoughby located?

Mark Willoughby practices at 3430 Cogswell Rd, El Monte, CA 91732. The listed phone number is (626) 453-3400.

What is Mark Willoughby's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Addiction (Substance Use Disorder), with taxonomy code 101YA0400X.

When was this NPI record last updated?

The NPPES record for Mark Willoughby was last updated on December 5, 2017. NPI Profile syncs with the weekly NPPES data releases published by CMS.