Addiction Therapist

Mary Elizabeth Feistner

934 N Mountain Ave Ste A-d, Upland, California, 91786-3659

About Mary Elizabeth Feistner

Mary Elizabeth Feistner is a therapist based in Upland, California who is specialized in Addiction (Substance Use Disorder) Counselor. Active license number of Mary Elizabeth Feistner is 14645 for Addiction (Substance Use Disorder) Counselor in California. Her current practice location is 934 N Mountain Ave Ste A-d, Upland. Patients can reach her at 951-683-6596. Mary Elizabeth Feistner NPI number (Unique professional ID assigned by NPPES) is 1508499526.

Mary Elizabeth Feistner is a licensed mental health therapist who help individuals struggling with addiction of alcohol, drug, or other substance use disorder. She helps her 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

Mary Elizabeth Feistner 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 Mary Elizabeth Feistner
Specialization Addiction (Substance Use Disorder) Counselor
Gender Female
Practice Address: 934 N Mountain Ave Ste A-d,
Upland, CA - 91786-3659

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 Number1508499526
NPI Enumeration Date: 18 Feb, 2020
NPI Last Update On: 10 Dec, 2025

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 Mary Elizabeth Feistner are as mentioned below.

License NumberSpecializationStateStatus
14645Addiction (Substance Use Disorder) Counselor CaliforniaPrimary

Mailing Address

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

Mary Elizabeth Feistner
934 N Mountain Ave Ste A-d,
Upland, CA - 91786-3659

Book an Appointment with Mary Elizabeth Feistner

To schedule an appointment, contact Mary Elizabeth Feistner at 934 N Mountain Ave Ste A-d, Upland, California or call on below stated phone number.

Call to Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Mary Elizabeth Feistner:

Mary Elizabeth Feistner is a therapist specializing in Addiction (Substance Use Disorder) Counselor. She is a licensed mental health therapist who help individuals struggling with addiction of alcohol, drug, or other substance use disorder. She helps her 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, Mary Elizabeth Feistner is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.

Mary Elizabeth Feistner practices at 934 N Mountain Ave Ste A-d, Upland, California, 91786-3659.

To schedule an appointment with Mary Elizabeth Feistner, please contact the office at 951-683-6596.

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