Katherin Adriana Sonneborn, PA

Primary specialty

Physician AssistantTaxonomy code 363A00000X

License

PA101126 Issued in MA

Practice address

3 Alumni Dr Ste 301
Exeter, NH 03833-2123

Phone

(603) 775-7405

Fax

(603) 775-7424

NPI assigned

Sep 14, 2010

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Enrolled in NH, MA2 enrollments

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 2

Specialty

Physician Assistant

Education

Other, 2010

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Massachusetts General Physicians Organization IncGroup PAC ID 2466365820, 3,494 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Massachusetts General Hospital Hospital, Boston, MA, CCN 220071

Merit-based Incentive Payment System (MIPS)

Final score

86.36 of 100Reported as apm

Quality

85.92

Promoting interoperability

78

Improvement activities

40

Medicare enrollment (NPD)

Not enrolled

HHS exclusion list flag

Flagged The directory lists this NPI on an HHS exclusion list. The OIG exclusions file (LEIE) holds no record for this NPI, and the directory does not say which list the flag comes from. How exclusions are shown Confirm with the OIG exclusions search.

Credentials

Physician Assistant

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: ksonneborn507244@direct.bilh.masshiway.net
• Direct secure messaging: sonneborn.katherin.mgh@direct.partners.masshiway.net

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.

• Massachusetts General Physicians Organization Inc

  • Dermatology Physician
  • Boston, MA
  • NPI 1801874573
  Medicare reassignment Care Compare group NPD
• Core Physicians, LLC

  • Family Medicine Physician
  • Exeter, NH
  • NPI 1336330588
  Medicare reassignment NPD
• Dartmouth-Hitchcock Clinic

  • Family Medicine Physician
  • Manchester, NH
  • NPI 1386697803
  Medicare reassignment NPD
• Dartmouth-Hitchcock Clinic

  • Internal Medicine Physician
  • Lebanon, NH
  • NPI 1548210198
  Medicare reassignment NPD
• The General Hospital Corporation

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1023049236
  Medicare reassignment
• General Hospital Corp

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1508390014
  NPD

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

• The General Hospital Corporation

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1023049236
  Care Compare affiliation

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

{
    "created_epoch": "1284422400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1765497600000",
    "number": "1881901718",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "7 HOLLAND WAY FL 1",
            "city": "EXETER",
            "state": "NH",
            "postal_code": "038332997",
            "telephone_number": "603-775-7405",
            "fax_number": "603-775-7424"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3 ALUMNI DR STE 301",
            "city": "EXETER",
            "state": "NH",
            "postal_code": "038332123",
            "telephone_number": "603-775-7405",
            "fax_number": "603-775-7424"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "100 Hitchcock Way",
            "address_2": "Dartmouth Hitchcock - General Surgery",
            "address_purpose": "LOCATION",
            "city": "Manchester",
            "state": "NH",
            "postal_code": "03104",
            "country_code": "US",
            "telephone_number": "603-695-2722",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "55 Fruit St",
            "address_purpose": "LOCATION",
            "city": "Boston",
            "state": "MA",
            "postal_code": "021142696",
            "country_code": "US",
            "telephone_number": "617-726-2000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SONNEBORN",
        "first_name": "KATHERIN",
        "middle_name": "ADRIANA",
        "credential": "PA",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2010-09-14",
        "last_updated": "2025-12-12",
        "certification_date": "2025-12-12",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363AS0400X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Surgical",
            "state": "NH",
            "license": "1029",
            "primary": false
        },
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MA",
            "license": "PA101126",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "3097987",
            "state": "NH"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Tessa Randall Smith, PSY.D.
• Mitchell Snell, PA
• Rebecca E Snider, MD
• Jason Matthew Snook
• Pamela Leanora Sollenberger, M.S., GC-C, CTP
• Marc Douglas Sopher, M.D.
• Marissa Elizabeth Souther, MSN, APRN, FNP-C
• Kenneth C Spengler, MD
• Donald M Sprague, DDS
• Michael St.Germain, DMD

• Physician Assistant in Exeter, NH
• Providers in Exeter, NH by specialty
• Physician Assistant in New Hampshire

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 12, 2025; 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.