Alissa Gregersen, AG-ACNP

Primary specialty

Nurse PractitionerTaxonomy code 363L00000X

License

CNP251909 Issued in ME

Practice address

149 North St
Waterville, ME 04901-4974

Phone

(207) 872-1307

Fax

(207) 872-1302

NPI assigned

Feb 16, 2018

Last updated

May 27, 2026By the provider in NPPES

Sex

Female

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Enrolled in DE

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

Specialty

Nurse Practitioner

Education

Other, 2017

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Bayhealth Medical Center, IncGroup PAC ID 1658364740, 399 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Bayhealth Medical Center, Kent Campus Hospital, Dover, DE, CCN 080004

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

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, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Bayhealth Medical Center, Inc.

  dba Bayhealth Observation Physicians

  • Emergency Medicine Physician
  • Dover, DE
  • NPI 1679072144
  Medicare reassignment Care Compare group NPD
• Bayhealth Emergency Physicians LLC

  • Emergency Medicine Physician
  • Dover, DE
  • NPI 1073012696
  Medicare reassignment NPD
• Bayhealth Medical Center, Inc

  • Gastroenterology Physician
  • Milford, DE
  • NPI 1639938525
  NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Bayhealth Medical Center, Inc.

  dba Bayhealth Hospital, Kent Campus

  • General Acute Care Hospital
  • Dover, DE
  • NPI 1467546135
  Care Compare affiliation

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

{
    "created_epoch": "1518739200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1779840000000",
    "number": "1922508902",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "149 NORTH ST",
            "city": "WATERVILLE",
            "state": "ME",
            "postal_code": "049014974",
            "telephone_number": "207-872-1307",
            "fax_number": "207-872-1302"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "149 NORTH ST",
            "city": "WATERVILLE",
            "state": "ME",
            "postal_code": "049014974",
            "telephone_number": "207-872-1307",
            "fax_number": "207-872-1302"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GREGERSEN",
        "first_name": "ALISSA",
        "credential": "AG-ACNP",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2018-02-16",
        "last_updated": "2026-05-27",
        "certification_date": "2026-05-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LG0600X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Gerontology",
            "state": "DE",
            "license": "LP-0000239",
            "primary": false
        },
        {
            "code": "363L00000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner",
            "state": "DE",
            "license": "LP-0000239",
            "primary": false
        },
        {
            "code": "363L00000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner",
            "state": "ME",
            "license": "CNP251909",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Erica Goss, MS, LCPC-C
• Chelsea Gourley, LCPC-C
• Sara Beth Graf, FNP-C
• Monica Elsie Graves, FNP-C
• Jennifer Florence Greene, RN
• Skye Gregory-Hatch
• Mary Ellen Gregory, PERSONAL SUPPORTS
• Hannah Grenier
• Patricia A. Grenier, LCSW
• Margaret B Griffin, M.D.

• Nurse Practitioner in Waterville, ME
• Providers in Waterville, ME by specialty
• Nurse Practitioner in Maine

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