Maryvalley Health Services PLLC

Primary specialty

Psychiatric/Mental Health Nurse PractitionerTaxonomy code 363LP0808X

Legal business name

MARYVALLEY HEALTH SERVICES PLLC

Practice address

1717 N St NW Ste 1
Washington, DC 20036-2827

Phone

(301) 433-3959

NPI assigned

Jul 13, 2026

Last updated

Jul 13, 2026By the provider in NPPES

Organization subpart

No

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

Authorized official

Name

Frans Adi Tassi, PMHNP-BC

Title

Owner

Phone

(301) 433-3959

Specialties & licenses 1

Addresses

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

{
    "created_epoch": "1783900800000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1783900800000",
    "number": "1477472611",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2508 DIDCOT CT # A",
            "city": "BOWIE",
            "state": "MD",
            "postal_code": "207212978",
            "telephone_number": "301-433-3959"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1717 N ST NW STE 1",
            "city": "WASHINGTON",
            "state": "DC",
            "postal_code": "200362827",
            "telephone_number": "301-433-3959"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "MARYVALLEY HEALTH SERVICES PLLC",
        "organizational_subpart": "NO",
        "enumeration_date": "2026-07-13",
        "last_updated": "2026-07-13",
        "certification_date": "2026-07-13",
        "status": "A",
        "authorized_official_last_name": "TASSI",
        "authorized_official_first_name": "FRANS",
        "authorized_official_middle_name": "ADI",
        "authorized_official_title_or_position": "OWNER",
        "authorized_official_telephone_number": "301-433-3959",
        "authorized_official_credential": "PMHNP-BC"
    },
    "taxonomies": [
        {
            "code": "363LP0808X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Psychiatric/Mental Health",
            "state": "NU",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Courtney Marzban
• Samantha Marzi, APRN
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• Tamara Marzouk, LICSW
• Gabby Marzullo-Dove

• Psychiatric/Mental Health Nurse Practitioner in Washington, DC
• Providers in Washington, DC by specialty
• Psychiatric/Mental Health Nurse Practitioner in District of Columbia

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; 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.