Mary Elizabeth Feistner
NPI 1508499526 · Addiction (Substance Use Disorder) Counselor · Upland, CA
Mary Elizabeth Feistner is a Addiction (Substance Use Disorder) Counselor provider in Upland, CA (NPI 1508499526).
Provider details
- NPI number
- 1508499526
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Sex
- Female
- Sole proprietor
- Yes
- License
- 14645 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-02-18
- Last updated
- 2025-12-10
- Certified
- 2025-12-10
Frequently asked questions
- What is Mary Elizabeth Feistner's NPI number?
- Mary Elizabeth Feistner's National Provider Identifier (NPI) is 1508499526, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Elizabeth Feistner's specialty?
- Mary Elizabeth Feistner is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Mary Elizabeth Feistner located?
- Mary Elizabeth Feistner's practice location on file with NPPES is 934 N Mountain Ave Ste A-D, Upland, CA 91786-3659.
- What is Mary Elizabeth Feistner's phone number?
- The practice phone number listed in the NPPES registry for Mary Elizabeth Feistner is (951) 683-6596.
- Is Mary Elizabeth Feistner's NPI active?
- Yes — Mary Elizabeth Feistner's NPI (1508499526) is active in the NPPES registry as of the last update on 2025-12-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.