NPIMap

Individual provider Active NPI

Janarthanan Someswarananthan, MD

  • Internal Medicine Physician
  • Chelmsford, MA
National Provider Identifier
1134212830
Registry record updated Apr 13, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
230684 Issued in MA
Practice address
290 Littleton Rd Unit 3
Chelmsford, MA 01824-3429
Phone
(978) 685-2460
NPI assigned
Oct 2, 2006
Last updated
Apr 13, 2026By the provider in NPPES
Sex
Male
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on Apr 13, 2026

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

Specialties & licenses 3

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X 230684 MA Primary
Internal Medicine Physician 207R00000X ME83087 FL
Hospitalist Physician 208M00000X 230684 MA

Addresses

Primary practice location

290 Littleton Rd Unit 3
Chelmsford, MA 01824-3429

Mailing address

290 Littleton Rd Unit 3
Chelmsford, MA 01824-3429
Phone (978) 685-2460

Other practice location 1

25 Highland Ave
Newburyport, MA 01950-3867
Phone (978) 463-1000

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MA, NH2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20070413000564 MA Practitioner - Internal Medicine 1557466919 Reassigns benefits to 9 organizations
I20200528002078 NH Practitioner - Internal Medicine 1557466919 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Internal Medicine
Education
Other, 1996
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Lawrence General Community Medical Service PLLCGroup PAC ID 4486941473, 53 clinicians
New England Community Medical Services PLLCGroup PAC ID 8628102928, 53 clinicians

Practice addresses (Care Compare)

15 Railroad Ave
South Hamilton, MA 01982-2218
Phone (978) 468-7381

23 Geremonty Dr
Salem, NH 03079-3314
Phone (978) 685-2460

290 Littleton Rd
Unit 3
Chelmsford, MA 01824-3406

290 Littleton Rd
Unit 3
Chelmsford, MA 01824-3429
Phone (978) 685-2460

Hospital & facility affiliations

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
ME83087FLMDInternal Medicine Physician
230684MAMDInternal Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Life Choice Hospice of Southern Massachusetts LLC CurrentSince Feb 11, 2021 Accepting new patients
Winchester Lahey Inpatient Specialists PLLC Internal Medicine CurrentSince Mar 4, 2018 Accepting new patients
Anna Jaques Inpatient Specialists PLLC Internal Medicine CurrentSince Feb 1, 2017 Accepting new patients
Steward Medical Group, Inc CurrentSince Jan 29, 2019 Accepting new patients
New England Community Medical Services PLLC Internal Medicine CurrentSince Jun 1, 2010 Accepting new patients
Life Choice Hospice of New Hampshire, LLC CurrentSince May 1, 2021 Accepting new patients
Anna Jaques Bidco Inpatient Specialists PLLC Internal Medicine CurrentSince Apr 1, 2017 Accepting new patients
Steward Medical Group, Inc CurrentSince Jan 29, 2019 Accepting new patients
Lowell General Inpatient Specialists PLLC Internal Medicine CurrentSince Sep 1, 2017 Accepting new patients
Pathways Healthcare, LLC CurrentSince Feb 14, 2015 Accepting new patients
Prescott Nursing and Rehab BHC Operations Past Accepting new patients
Willow Brook Operator LLC Past Accepting new patients
Marion Oaks Medical Clinic of Central Florida Inc PastSince Feb 1, 2001 Accepting new patients
Westford Nursing and Rehab BHC Operations Past Accepting new patients
Aspen Hill Operator LLC Past Accepting new patients
Salemhaven, Inc. Past Accepting new patients
Cedar View Operator LLC Past Accepting new patients
Wilmington Rehab Center LLC Past Accepting new patients
Adviniacare Newburyport LLC Past Accepting new patients
Berkeley Retirement Home Past Accepting new patients
Bear Mt Andover LLC Past Accepting new patients
Brentwood Operator, LLC Past Accepting new patients
Blueberry Hill Operator LLC Past Accepting new patients
Cogent Healthcare of Fort Myers, LLC Internal Medicine Past Accepting new patients
Anna Jaques Hospital Past Accepting new patients

Locations

11 Nevins St
Ste 201
Brighton, MA 02135
Phone (617) 789-2442

290 Littleton Rd
Unit 3
Chelmsford, MA 01824
Phone (978) 258-4734

140 Lincoln Ave
Haverhill, MA 01830
Phone (978) 374-2000

100 Amesbury St
Ste 103
Lawrence, MA 01840
Phone (978) 683-0157

1 Hospital Dr
Lowell, MA 01852
Phone (978) 687-0156

295 Varnum Ave
Lowell, MA 01854
Phone (978) 788-7344

70 East St
Methuen, MA 01844
Phone (978) 682-1906

1 Wallace Bashaw Way
Ste 1002
Newburyport, MA 01950
Phone (978) 255-2612

25 Highland Ave
Newburyport, MA 01950
Phone (978) 258-4734

1801 Turnpike St
North Andover, MA 01845
Phone (978) 454-8086

47 High St
Ste 101
North Andover, MA 01845
Phone (978) 258-4734

790 Turnpike St
Ste 202
North Andover, MA 01845
Phone (978) 777-8222

790 Turnpike St
Ste 302
North Andover, MA 01845
Phone (978) 655-7782

35 United Dr
Ste 102
West Bridgewater, MA 02379

101 Station Dr
Ste 240
Westwood, MA 02090
Phone (781) 706-1079

41 Highland Ave
Winchester, MA 01890
Phone (781) 756-2000

1 Hampton Rd
Unit 210
Exeter, NH 03833
Phone (603) 964-5183

23 Geremonty Dr
Salem, NH 03079
Phone (603) 893-5586

1 Harbison Way
Ste 222
Columbia, SC 29212

10 Cadillac Dr
Ste 400
Brentwood, TN 37027
Phone (615) 637-9163

Interoperability endpoints

  • Direct secure messaging: jsomeswarananthan140851@tuftsmedicine.direct-ci.com

Ownership & related parties

All facility ownership & control disclosures 16

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

FacilityTypeRoleSince
Blueberry Hill Rehabilitation and Healthcare CenterBeverly, MA, CCN 225133 Skilled nursing facility Operational/Managerial Control
Adp of the SNF		 Feb 7, 2018
Feb 7, 2018
Cedar View Rehabilitation and Healthcare CenterMethuen, MA, CCN 225333 Skilled nursing facility Operational/Managerial Control
Adp of the SNF		 Sep 1, 2016
Sep 1, 2016
Quabbin Valley HealthcareAthol, MA, CCN 225296 Skilled nursing facility 5% Or Greater Indirect Ownership Interest (24.83%)
Adp of the SNF		 Jan 1, 2020
Jan 7, 2025
Aspen Hill Rehabilitation and Healthcare CenterHaverhill, MA, CCN 225404 Skilled nursing facility Operational/Managerial Control
Adp of the SNF		 Jun 28, 2022
Feb 24, 2025
Prescott HouseNorth Andover, MA, CCN 225510 Skilled nursing facility Operational/Managerial Control
Adp of the SNF		 Feb 1, 2023
Feb 1, 2023
Willow Brook Rehabilitation and Healthcare CenterWilmington, MA, CCN 225568 Skilled nursing facility Operational/Managerial Control
Adp of the SNF		 Oct 31, 2024
Oct 31, 2024
Vantage at Andover LLCAndover, MA, CCN 225558 Skilled nursing facility Operational/Managerial Control
Adp of the SNF		 Dec 29, 2025
Dec 29, 2025
Pathways HealthcareWestwood, MA, CCN 227569 Home health agency 5% Or Greater Indirect Ownership Interest (16.7%)
Corporate Director
Operational/Managerial Control		 Dec 12, 2014
Dec 12, 2014
Dec 31, 2014
Pathways HealthcareKingston, PA, CCN 397733 Home health agency 5% Or Greater Indirect Ownership Interest (6.6%) Feb 22, 2016
Pathways HealthcareLondonderry, NH, CCN 307095 Home health agency 5% Or Greater Indirect Ownership Interest (16.7%)
Corporate Director
Operational/Managerial Control		 Dec 12, 2014
Dec 12, 2014
Dec 12, 2014
Pathways Healthcare LLCCranston, RI, CCN 417071 Home health agency 5% Or Greater Indirect Ownership Interest (16.7%)
Corporate Director
Operational/Managerial Control		 Dec 12, 2014
Dec 12, 2014
Dec 12, 2014
Pathways Healthcare LLCYork, ME, CCN 207084 Home health agency 5% Or Greater Indirect Ownership Interest (16.7%)
Corporate Director
Operational/Managerial Control		 Dec 12, 2014
Dec 12, 2014
Dec 12, 2014
Pathways HealthcareKingston, PA, CCN 398010 Home health agency 5% Or Greater Indirect Ownership Interest (16.7%)
Corporate Director		 Sep 6, 2025
Sep 6, 2025
Compassus-Southern MassachusettsNorth Andover, MA, CCN 221555 Hospice Contracted Managing Employee Dec 1, 2015
Pathways Healthcare LLCWestwood, MA, CCN 221614 Hospice 5% Or Greater Indirect Ownership Interest
Corporate Director
Operational/Managerial Control		 Dec 12, 2014
Dec 12, 2014
Dec 12, 2014
Pathways Healthcare LLCLondonderry, NH, CCN 301538 Hospice 5% Or Greater Indirect Ownership Interest Dec 12, 2014

Owned or controlled facilities with NPI records 11

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

Organizations & group practices 28

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.

View all 28

Hospital & facility affiliations 21

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

View all 21

NPI Registry JSON

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

{
    "created_epoch": "1159747200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1776038400000",
    "number": "1134212830",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "290 LITTLETON RD UNIT 3",
            "city": "CHELMSFORD",
            "state": "MA",
            "postal_code": "018243429",
            "telephone_number": "978-685-2460"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "290 LITTLETON RD UNIT 3",
            "city": "CHELMSFORD",
            "state": "MA",
            "postal_code": "018243429",
            "telephone_number": "978-685-2460"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "25 Highland Ave",
            "address_purpose": "LOCATION",
            "city": "Newburyport",
            "state": "MA",
            "postal_code": "019503867",
            "country_code": "US",
            "telephone_number": "978-463-1000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SOMESWARANANTHAN",
        "first_name": "JANARTHANAN",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2006-10-02",
        "last_updated": "2026-04-13",
        "certification_date": "2026-04-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MA",
            "license": "230684",
            "primary": true
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "FL",
            "license": "ME83087",
            "primary": false
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "MA",
            "license": "230684",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Chelmsford, MA

Sources for this page

Verify at the official NPI Registry.