Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mary Elizabeth Feistner

Addiction (Substance Use Disorder) Counselor in Upland, CA · enumerated 2020 · practices at Inland Valley Drug and Alcohol Recovery Services.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1508499526

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Registry record

Entity type Individual (Type 1)

Name Mary Elizabeth Feistner

Sex Female

Practice address Upland, CA, 91786

Phone (951) 683-6596

Enumeration date Feb 18, 2020

Last updated in NPPES Dec 10, 2025

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 14645 (CA) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify Mary Elizabeth Feistner's NPI record?

Cross-check NPI 1508499526 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1508499526 active?

Yes, as of the latest NPPES snapshot, NPI 1508499526 is active (record last updated 2025-12-10).

Other providers at this practice address

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Inland Valley Drug and Alcohol Recovery Services Substance Use Disorder Rehabilitation Clinic/Center · Upland, CA NPI 1316086739 Sherrie Grizzelle Addiction (Substance Use Disorder) Counselor · Upland, CA NPI 1871048900 Patricia Alley Addiction (Substance Use Disorder) Counselor · Upland, CA NPI 1154067312 Andrea Strotz Addiction (Substance Use Disorder) Counselor · Upland, CA NPI 1396428819 Isabel Toledo Addiction (Substance Use Disorder) Counselor · Upland, CA NPI 1477310043 Kennedy Durant Addiction (Substance Use Disorder) Counselor · Upland, CA NPI 1528889524 Christine Meraz Student in an Organized Health Care Education/Training Program · Upland, CA NPI 1508720343 Lauren Mccarroll Addiction (Substance Use Disorder) Counselor · Upland, CA NPI 1700710126

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-12-10.