Mary Ellen O'Brien, NMD, FNP

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

RN087042 Issued in AZ

Practice address

2127 E Baseline Rd
Suite 103
Tempe, AZ 85283-1537

Phone

(480) 491-1716

Fax

(480) 491-5920

NPI assigned

Mar 22, 2007

Sex

Female

Sole proprietor

Yes

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Opted out of Medicare

Yes, effective Apr 1, 2017 through Apr 1, 2027

Medicare enrollment (NPD)

Not enrolled

State licenses

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

{
    "created_epoch": "1174521600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757548800000",
    "number": "1285750240",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "8325 E KEIM DR",
            "city": "SCOTTSDALE",
            "state": "AZ",
            "postal_code": "852505847",
            "telephone_number": "480-481-7872"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2127 E BASELINE RD",
            "address_2": "SUITE 103",
            "city": "TEMPE",
            "state": "AZ",
            "postal_code": "852831537",
            "telephone_number": "480-491-1716",
            "fax_number": "480-491-5920"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "MARY",
        "middle_name": "ELLEN",
        "name_prefix": "Dr.",
        "credential": "NMD, FNP",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2007-03-22",
        "last_updated": "2025-09-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "175F00000X",
            "taxonomy_group": "",
            "desc": "Naturopath",
            "state": "AZ",
            "license": "97-514",
            "primary": false
        },
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "AZ",
            "license": "RN087042",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Laura M Nyhus, PT
• Haley Marie Nykamp
• Carol B Nystuen, LPC
• Kareen Merle O'Brien, ND
• Katherine Mary O'Brien
• Taylor Ann O'Brien, MA, SLP-CFY
• Kayla O'Bryant
• Patricia Anne O'Connor, LCSW
• Margot Kirkpatrick O'Donnal
• Sarah O'Donnell, RN

• Family Nurse Practitioner in Tempe, AZ
• Providers in Tempe, AZ by specialty
• Family Nurse Practitioner in Arizona

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring; Opt Out Affidavits.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.