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MARY ELIZABETH FEISTNER
NPI 1508499526
Counselor - Addiction (Substance Use Disorder) in Upland, CA

Active since February 18, 2020
934 N MOUNTAIN AVE STE A-D, UPLAND, CA 91786(951) 683-6596 Get Directions Write a Review

NPPES record last updated: December 10, 2025. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Dec 10, 2025, Apr 2, 2025, Jul 23, 2024 and 6 more (9 updates tracked since 2020).

About Mary Elizabeth Feistner NPPES

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

MARY ELIZABETH FEISTNER (NPI 1508499526) is an individual addiction (substance use disorder) provider in Upland, California, licensed in California (14645) and active in the NPI registry since February 2020.

NPPES Registry Identity

NPI1508499526
Entity TypeIndividualFemale
Primary Taxonomy101YA0400X
Provider Legal NameMARY ELIZABETH FEISTNER
Location Address934 N MOUNTAIN AVE STE A-DUpland, CA 91786-3659
Mailing Address934 N Mountain Ave Ste A-dUpland, CA 91786-3659
Phone(951) 683-6596
Sole ProprietorYes
Enumeration DateFebruary 18, 2020
Last NPPES UpdateDecember 10, 20259 updates tracked since enumeration
NPPES CertifiedDecember 10, 2025
✔ NPI 1508499526 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
License✔ Licensed in CA · 14645
934 N MOUNTAIN AVE STE A-D, Upland, CA 91786
Open in Google Maps ↗

Other Names 1

Former Name (1)Mary Elizabeth Miller

Other Providers at the Same Location NPPES 8

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ANDREA STROTZ
Counselor (Addiction (Substance Use Disorder))
934 N MOUNTAIN AVE STE A-D
UPLAND, CA 91786
San Bernardino County (909) 949-4667
INLAND VALLEY DRUG AND ALCOHOL RECOVERY SERVICES
Clinic/Center (Rehabilitation, Substance Use Disorder)
934 N MOUNTAIN AVE STE A-D
UPLAND, CA 91786
San Bernardino County (909) 949-4667
ISABEL TOLEDO
Counselor (Addiction (Substance Use Disorder))
934 N MOUNTAIN AVE STE A-D
UPLAND, CA 91786
San Bernardino County (909) 949-4667
SHERRIE GRIZZELLE
Counselor (Addiction (Substance Use Disorder))
934 N MOUNTAIN AVE STE A-D
UPLAND, CA 91786
San Bernardino County (909) 949-4667
KENNEDY TERESA DURANT
Counselor (Addiction (Substance Use Disorder))
934 N MOUNTAIN AVE STE A-D
UPLAND, CA 91786
San Bernardino County (909) 949-4667
CHRISTINE MERAZ
Student in an Organized Health Care Education/Training Program
934 N MOUNTAIN AVE STE A-D
UPLAND, CA 91786
San Bernardino County (909) 949-4667
PATRICIA ALLEY
Counselor (Addiction (Substance Use Disorder))
934 N MOUNTAIN AVE STE A-D
UPLAND, CA 91786
San Bernardino County (909) 949-4667
LAUREN MARIE MCCARROLL
Counselor (Addiction (Substance Use Disorder))
934 N MOUNTAIN AVE STE A-D
UPLAND, CA 91786
San Bernardino County (909) 949-4667

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 Mary Elizabeth Feistner's NPI number?

The NPI number for Mary Elizabeth Feistner is 1508499526. It was assigned to this individual provider in the NPPES registry on February 18, 2020. The provider is also known as Mary Elizabeth Miller.

Where is Mary Elizabeth Feistner located?

Mary Elizabeth Feistner practices at 934 N Mountain Ave Ste A-D, Upland, CA 91786. The listed phone number is (951) 683-6596.

What is Mary Elizabeth Feistner'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 Mary Elizabeth Feistner was last updated on December 10, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.