Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mary Elizabeth Feistner

Individual provider Addiction (Substance Use Disorder) Counselor · NPI 1508499526

Mary Elizabeth Feistner is an Addiction (Substance Use Disorder) Counselor in Upland, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2020
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Practice location Address checks out

934 N Mountain Ave Ste A-D
Upland, CA 91786-3659
Phone: (951) 683-6596
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Addiction (Substance Use Disorder) Counselor (primary) Taxonomy 101YA0400X · Licence 14645 (CA)

Record details

NPI number1508499526
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorYes
NPI enumeratedFebruary 18, 2020
Last updated in NPPESDecember 10, 2025
Certification dateDecember 10, 2025

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