Mary Elizabeth Feistner

Primary specialty

Addiction (Substance Use Disorder) CounselorTaxonomy code 101YA0400X

License

14645 Issued in CA

Practice address

934 N Mountain Ave Ste a-D
Upland, CA 91786-3659

Phone

(951) 683-6596

NPI assigned

Feb 18, 2020

Sex

Female

Sole proprietor

Yes

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Other names 1

• Mary Elizabeth Miller Former name

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Practice roles

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• G & C Swan Inc

  • Substance Abuse Rehabilitation Facility
  • Colton, CA
  • NPI 1710707310
  NPD (past)
• G & C Swan Inc

  • Substance Abuse Rehabilitation Facility
  • Claremont, CA
  • NPI 1740569235
  NPD (past)
• Mfi Recovery Center

  • Substance Abuse Rehabilitation Facility
  • Riverside, CA
  • NPI 1306202866
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1581984000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1765324800000",
    "number": "1508499526",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "934 N MOUNTAIN AVE STE A-D",
            "city": "UPLAND",
            "state": "CA",
            "postal_code": "917863659"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "934 N MOUNTAIN AVE STE A-D",
            "city": "UPLAND",
            "state": "CA",
            "postal_code": "917863659",
            "telephone_number": "951-683-6596"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FEISTNER",
        "first_name": "MARY ELIZABETH",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2020-02-18",
        "last_updated": "2025-12-10",
        "certification_date": "2025-12-10",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "101YA0400X",
            "taxonomy_group": "",
            "desc": "Counselor, Addiction (Substance Use Disorder)",
            "state": "CA",
            "license": "14645",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "MARY ELIZABETH",
            "last_name": "MILLER",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Kimberly Farley
• Ferrari Farris-Singh
• Fatima H. Hakkak D.O., Inc.
• Yola Fawaz
• Bryanna Fedorka, DPT
• Felicia a Simonis OD
• Adam Patrick Fernandez
• Alexandro Fernandez, N.P.
• Katherine Fernandez
• Rodolfo Leonel Fernandez, CDAAC

• Addiction (Substance Use Disorder) Counselor in Upland, CA
• Providers in Upland, CA by specialty
• Addiction (Substance Use Disorder) Counselor in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 10, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.