William Francis O'Brien, M.D.

Primary specialty

Maternal & Fetal Medicine PhysicianTaxonomy code 207VM0101X

License

ME42212 Issued in FL

Practice address

9981 Healthpark CR
Suite 159
Fort Myers, FL 33908

Phone

(239) 481-5477

Fax

(239) 481-5892

NPI assigned

Dec 5, 2005

Sex

Male

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

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Interoperability endpoints

• Direct secure messaging: william.o.brien.1@18455.direct.athenahealth.com

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

{
    "created_epoch": "1133740800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1700860558",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "9981 HEALTHPARK CR",
            "address_2": "SUITE 159",
            "city": "FORT MYERS",
            "state": "FL",
            "postal_code": "33908",
            "telephone_number": "239-481-5477",
            "fax_number": "239-481-5892"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "9981 HEALTHPARK CR",
            "address_2": "SUITE 159",
            "city": "FORT MYERS",
            "state": "FL",
            "postal_code": "33908",
            "telephone_number": "239-481-5477",
            "fax_number": "239-481-5892"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "WILLIAM",
        "middle_name": "FRANCIS",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-12-05",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207VM0101X",
            "taxonomy_group": "",
            "desc": "Obstetrics & Gynecology, Maternal & Fetal Medicine",
            "state": "FL",
            "license": "ME42212",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Nursing Alliance Home Care West Coast Inc
• Chelsey Dianne Nuzum, MSN ARNP FNP-BC
• Justine Nyman, LMHC
• Caleigh O'Brien
• Stacy Marie O'Brien, APRN
• Katherine Alicia Bleil O'Connell, PT
• Carly Noelle O'Connor, OTR/L
• Jillian O'Dell
• Stephanie A O'Dell
• John Thornton O'Donnell, M.D.

• Maternal & Fetal Medicine Physician in Fort Myers, FL
• Providers in Fort Myers, FL by specialty
• Maternal & Fetal Medicine Physician in Florida

• 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.