Addiction Therapist

Mark Glenn Willoughby

3430 Cogswell Rd, El Monte, California, 91732-2785

About Mark Glenn Willoughby

Mark Glenn Willoughby is a therapist based in El Monte, California who is specialized in Addiction (Substance Use Disorder) Counselor. His current practice location is 3430 Cogswell Rd, El Monte. Patients can reach him at 626-453-3400. Mark Glenn Willoughby NPI number (Unique professional ID assigned by NPPES) is 1174038756.

Mark Glenn Willoughby is a licensed mental health therapist who help individuals struggling with addiction of alcohol, drug, or other substance use disorder. He helps his clients by manage and overcome the psychological, emotional, and behavioral challenges related to substance use. Counselors also work closely with families and support systems to help them better understand their loved one’s illness. SUD counselors help to promote long-term sobriety, emotional stability, and overall mental wellness for both the individual and their family.

Practice Information

Mark Glenn Willoughby speciality, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name Mark Glenn Willoughby
Specialization Addiction (Substance Use Disorder) Counselor
Gender Male
Practice Address: 3430 Cogswell Rd,
El Monte, CA - 91732-2785

Professional Identification Codes

NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to health care providers in the United States by the Centers for Medicare and Medicaid Services (CMS). NPI details are as mentioned below.

NPI Number1174038756
NPI Enumeration Date: 05 Dec, 2017
NPI Last Update On: 05 Dec, 2017

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialities in the same state or different states. Related medical licenses for Mark Glenn Willoughby are as mentioned below.

License NumberSpecializationStateStatus
Addiction (Substance Use Disorder) Counselor Primary

Mailing Address

Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned Practice address.

Mark Glenn Willoughby
3430 Cogswell Rd,
El Monte, CA - 91732-2785

Book an Appointment with Mark Glenn Willoughby

To schedule an appointment, contact Mark Glenn Willoughby at 3430 Cogswell Rd, El Monte, California or call on below stated phone number.

Call to Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Mark Glenn Willoughby:

Mark Glenn Willoughby is a therapist specializing in Addiction (Substance Use Disorder) Counselor. He is a licensed mental health therapist who help individuals struggling with addiction of alcohol, drug, or other substance use disorder. He helps his clients by manage and overcome the psychological, emotional, and behavioral challenges related to substance use. Counselors also work closely with families and support systems to help them better understand their loved one’s illness. SUD counselors help to promote long-term sobriety, emotional stability, and overall mental wellness for both the individual and their family.

Yes, Mark Glenn Willoughby is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.

Mark Glenn Willoughby practices at 3430 Cogswell Rd, El Monte, California, 91732-2785.

To schedule an appointment with Mark Glenn Willoughby, please contact the office at 626-453-3400.

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**Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 14 September, 2026.