Nathaniel M Grassi, MS

Primary specialty

Mental Health CounselorTaxonomy code 101YM0800X

License

MH25377 Issued in FL

Practice address

836 Prudential Dr Ste 1507
Jacksonville, FL 32207-8342

Phone

(904) 376-3800

NPI assigned

Jul 3, 2023

Sex

Female

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in FL

Eligible to order & refer

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

Green means eligible to order or refer.

Enrollment records 1

Specialty

Mental Health Counselor

Education

Other, 2022

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Master of Science

State licenses

Practice roles

Locations

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.

• Baptist Behavioral Health, LLC

  • Professional Counselor
  • Jacksonville, FL
  • NPI 1215906649

  Mental Health

  Medicare reassignment NPD

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

{
    "created_epoch": "1688342400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1777248000000",
    "number": "1881371615",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 748519",
            "city": "ATLANTA",
            "state": "GA",
            "postal_code": "303748519",
            "telephone_number": "904-376-3800"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "836 PRUDENTIAL DR STE 1507",
            "city": "JACKSONVILLE",
            "state": "FL",
            "postal_code": "322078342",
            "telephone_number": "904-376-3800"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "820 Prudential Dr Ste 510",
            "address_purpose": "LOCATION",
            "city": "Jacksonville",
            "state": "FL",
            "postal_code": "322078207",
            "country_code": "US",
            "telephone_number": "904-376-3800",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "GRASSI",
        "first_name": "NATHANIEL",
        "middle_name": "M",
        "credential": "MS",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2023-07-03",
        "last_updated": "2026-04-27",
        "certification_date": "2026-04-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "101YM0800X",
            "taxonomy_group": "",
            "desc": "Counselor, Mental Health",
            "state": "FL",
            "license": "MH25377",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Stacey M Grant
• Telisa Grant, APRN
• Granzow Medical LLP
• Joachim W Granzow, M.D.
• Megan Andrena Graser
• Brett I Gratz, MD
• Robine N Grause
• Debra Mosley Graves
• Erik P Graves
• Sarah Graves

• Mental Health Counselor in Jacksonville, FL
• Providers in Jacksonville, FL by specialty
• Mental Health Counselor in Florida

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 27, 2026; 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.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.