Catharine Mary Armentrout, FNP

Primary specialty

Nurse PractitionerTaxonomy code 363L00000X

License

RN2311164 Issued in MA

Practice address

1049 Main St
Springfield, MA 01103-2114

Phone

(413) 739-1100

NPI assigned

Nov 9, 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

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in MA

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, 2010

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Umass Memorial Medical Group IncGroup PAC ID 4284539891, 2,494 clinicians

Holyoke Medical Center IncGroup PAC ID 2163419383, 202 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Holyoke Medical Center Hospital, Holyoke, MA, CCN 220024
• Umass Memorial Health - Harrington Hospital Hospital, Southbridge, MA, CCN 220019

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: catharine.armentrout@direct.hmcs.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.

• Holyoke Medical Center, Inc.

  • General Acute Care Hospital
  • Holyoke, MA
  • NPI 1750395737
  Medicare reassignment Care Compare group NPD
• Umass Memorial Medical Group Inc

  • Internal Medicine Physician
  • Worcester, MA
  • NPI 1760445373

  Nurse Practitioner

  Medicare reassignment Care Compare group NPD
• Athol Memorial Hospital Incorporated

  • Critical Access Hospital
  • Athol, MA
  • NPI 1336120047

  Nurse Practitioner

  Medicare reassignment NPD
• Dispatchhealth Massachusetts PC

  • Emergency Medicine Physician
  • Auburn, MA
  • NPI 1629555842
  Medicare reassignment NPD
• Henry Heywood Memorial Hospital

  • General Acute Care Hospital
  • Gardner, MA
  • NPI 1205823879

  Nurse Practitioner

  Medicare reassignment NPD
• Mass General Brigham Medical Group Western Massachusetts Inc

  • Family Medicine Physician
  • Northampton, MA
  • NPI 1295787919
  Medicare reassignment NPD
• Steward Medical Group, Inc

  • Specialist
  • Watertown, MA
  • NPI 1629398219
  Medicare reassignment NPD
• Western Mass Physician Associates Inc

  • Obstetrics & Gynecology Physician
  • Chicopee, MA
  • NPI 1922009547
  Medicare reassignment NPD
• Henry Heywood Memorial Hospital

  • Psychiatric Hospital Unit
  • Gardner, MA
  • NPI 1457685299
  NPD
• Steward Medical Group, Inc

  • Specialist
  • Brighton, MA
  • NPI 1356654495
  NPD
• Umass Memorial Medical Group, Inc.

  • Urgent Care Clinic/Center
  • Oxford, MA
  • NPI 1982381018
  NPD
• Western Mass Physician Associates Inc

  • Internal Medicine Physician
  • Westfield, MA
  • NPI 1366087363
  NPD

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

• Holyoke Medical Center, Inc.

  • General Acute Care Hospital
  • Holyoke, MA
  • NPI 1750395737
  Care Compare affiliation
• Umass Memorial Health-Harrington Hospital Inc

  • General Acute Care Hospital
  • Southbridge, MA
  • NPI 1790780047
  Care Compare affiliation

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

{
    "created_epoch": "1289260800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1785974400000",
    "number": "1275834061",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1049 MAIN ST",
            "city": "SPRINGFIELD",
            "state": "MA",
            "postal_code": "011032114",
            "telephone_number": "413-739-1100"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1049 MAIN ST",
            "city": "SPRINGFIELD",
            "state": "MA",
            "postal_code": "011032114",
            "telephone_number": "413-739-1100"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "100 South St",
            "address_purpose": "LOCATION",
            "city": "Southbridge",
            "state": "MA",
            "postal_code": "015504051",
            "country_code": "US",
            "telephone_number": "508-909-7735",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "68 Harris Bushville Rd",
            "address_purpose": "LOCATION",
            "city": "Harris",
            "state": "NY",
            "postal_code": "12742",
            "country_code": "US",
            "telephone_number": "845-333-8484",
            "fax_number": "845-794-5675",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "707 E Main St",
            "address_purpose": "LOCATION",
            "city": "Middletown",
            "state": "NY",
            "postal_code": "109402650",
            "country_code": "US",
            "telephone_number": "845-333-3370",
            "fax_number": "845-333-3372",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ARMENTROUT",
        "first_name": "CATHARINE",
        "middle_name": "MARY",
        "credential": "FNP",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2010-11-09",
        "last_updated": "2026-08-06",
        "certification_date": "2026-08-06",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "NY",
            "license": "336548",
            "primary": false
        },
        {
            "code": "363L00000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner",
            "state": "MA",
            "license": "RN2311164",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "carmentrout36196@direct.garnethealth.org",
            "affiliation": "Y",
            "affiliationName": "Garnet Health Doctors PC",
            "address_1": "707 E Main St",
            "city": "Middletown",
            "state": "NY",
            "country_code": "US",
            "postal_code": "109402650",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Abdul Arham, MD
• Derick Kwame Arhin
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• Maria Arias
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• Arminder Singh MD PC
• Grace Armstrong
• Joseph Armstrong
• Kelly L. Armstrong, M.D.
• Andrea Arnold

• Nurse Practitioner in Springfield, MA
• Providers in Springfield, MA by specialty
• Nurse Practitioner in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 6, 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.