NPIMap

Individual provider Active NPI

Erin O'Hara, M.D.

  • Internal Medicine Physician
  • Nashua, NH
National Provider Identifier
1942407077
Registry record updated Sep 24, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
40072 Issued in NH
Practice address
29 Northwest Blvd
Nashua, NH 03063-4068
Phone
(603) 577-3275
NPI assigned
Jul 2, 2007
Last updated
Sep 24, 2026By the provider in NPPES
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Sep 24, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Pediatrics Physician 208000000X 40072 NH
Internal Medicine Physician 207R00000X 40072 NH Primary

Addresses

Primary practice location

29 Northwest Blvd
Nashua, NH 03063-4068

Mailing address

PO Box 3677
Nashua, NH 03061-3677
Phone (603) 577-7900

Other names 1

  • Erin Toohil Other name

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MA
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20100315000263 MA Practitioner - Internal MedicinePractitioner - Pediatric Medicine 2062547136 Reassigns benefits to 4 organizations

Care Compare profile

Medicare Care Compare
Specialty
Internal MedicineAlso: Pediatric Medicine
Education
University of Massachusetts Medical School, 2007
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Heywood Medical Group Inc.Group PAC ID 6901882836, 111 clinicians

Practice addresses (Care Compare)

250 Green St
Gardner, MA 01440-1396
Phone (978) 630-6460

266 Main St
Gardner, MA 01440-2927
Phone (978) 630-5030

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
239461MAMDInternal Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Henry Heywood Memorial Hospital CurrentSince Mar 3, 2020 Accepting new patients
Athol Memorial Hospital Incorporated CurrentSince Aug 13, 2018 Accepting new patients
Henry Heywood Memorial Hospital CurrentSince Mar 3, 2020 Accepting new patients
Emerson Practice Associates, Inc. Internal Medicine CurrentSince Aug 1, 2012 Accepting new patients
Heywood Medical Group Inc. Internal Medicine CurrentSince May 1, 2015 Accepting new patients

Locations

2033 Main St
Athol, MA 01331
Phone (978) 249-1295

133 Ornac
Concord, MA 01742
Phone (978) 287-3000

242 Green St
Gardner, MA 01440
Phone (978) 258-4734

250 Green St
Gardner, MA 01440
Phone (978) 630-5050

266 Main St
Gardner, MA 01440
Phone (978) 630-5030

55 Lake Ave N
Worcester, MA 01655
Phone 508334100048862

Interoperability endpoints

  • Direct secure messaging: erin.o.hara.1@192.direct.athenahealth.com
  • Direct secure messaging: erin.o.hara.2@192.direct.athenahealth.com

Ownership & related parties

All facility ownership & control disclosures 2

Facilities whose Medicare enrollment lists this provider’s PECOS associate ID as an owner or managing party.

FacilityTypeRoleSince
Heywood HospitalGardner, MA, CCN 220095 Hospital Corporate Director Jan 1, 2022
Athol Memorial HospitalAthol, MA, CCN 221303 Hospital Corporate Director Jan 1, 2022

Owned or controlled facilities with NPI records 3

Facilities whose Medicare enrollment lists this provider as an owner, officer, director or managing party.

Organizations & group practices 5

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.

Hospital & facility affiliations 10

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

NPI Registry JSON

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

{
    "created_epoch": "1183334400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1790208000000",
    "number": "1942407077",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 3677",
            "city": "NASHUA",
            "state": "NH",
            "postal_code": "030613677",
            "telephone_number": "603-577-7900",
            "fax_number": "603-577-7972"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "29 NORTHWEST BLVD",
            "city": "NASHUA",
            "state": "NH",
            "postal_code": "030634068",
            "telephone_number": "603-577-3275"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'HARA",
        "first_name": "ERIN",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2007-07-02",
        "last_updated": "2026-09-24",
        "certification_date": "2026-09-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208000000X",
            "taxonomy_group": "",
            "desc": "Pediatrics",
            "state": "NH",
            "license": "40072",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "NH",
            "license": "40072",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "ERIN",
            "last_name": "TOOHIL",
            "code": "5",
            "type": "Other Name"
        }
    ]
}

Other providers in Nashua, NH

Sources for this page

Verify at the official NPI Registry.