Mary Ann Fieffer, APRN, RN

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

003167 Issued in CT

Practice address

800 Howard Ave
Yale Physicians BLDG
New Haven, CT 06519-1369

Phone

(203) 785-2140

Fax

(203) 785-6414

NPI assigned

Jun 3, 2006

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 CT

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.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Registered Nurse

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.

• Step Up Care PC LLC

  • Counselor
  • Danielson, CT
  • NPI 1154884740
  Medicare reassignment NPD
• Superior Health Care of CT, LLC

  • Critical Care Medicine (Internal Medicine) Physician
  • Wolcott, CT
  • NPI 1366981128
  Medicare reassignment NPD
• Matrix Medical Plus

  • Nurse Practitioner
  • Nashville, TN
  • NPI 1376973461

  CT

  Medicare reassignment NPD
• Signify Health Medical Associates, PLLC

  • General Practice Physician
  • Dallas, TX
  • NPI 1750845863

  CT

  Medicare reassignment NPD

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

{
    "created_epoch": "1149292800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1932147675",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "300 GEORGE ST",
            "address_2": "PO BOX 9805",
            "city": "NEW HAVEN",
            "state": "CT",
            "postal_code": "065116624",
            "telephone_number": "203-785-7998",
            "fax_number": "203-785-6414"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "800 HOWARD AVE",
            "address_2": "YALE PHYSICIANS BLDG",
            "city": "NEW HAVEN",
            "state": "CT",
            "postal_code": "065191369",
            "telephone_number": "203-785-2140",
            "fax_number": "203-785-6414"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FIEFFER",
        "first_name": "MARY ANN",
        "credential": "APRN, RN",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-06-03",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "CT",
            "license": "003167",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Thomas Bradford Fetherston, MD
• Bruce Fichandler, P.A.
• Cameron Nicholas Fick, MD
• Jordan Ficocelli
• Paul N Fiedler, MD
• Kelly Fielder, PA-C
• Madison Faith Fielding, PHARMD
• Fields and Fields LLC
• Abigail Elizabeth Fields, LMSW
• Emily Fields

• Family Nurse Practitioner in New Haven, CT
• Providers in New Haven, CT by specialty
• Family Nurse Practitioner in Connecticut

• 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.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.