NPIMap

Organization Active NPI

Atlantic Digestive Specialists, PLLC

  • Gastroenterology Physician
  • Somersworth, NH
National Provider Identifier
1316048069
Registry record updated Apr 16, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Gastroenterology PhysicianTaxonomy code 207RG0100X
Legal business name
ATLANTIC DIGESTIVE SPECIALISTS, PLLC
Practice address
21 Clark Way
Somersworth, NH 03878-4401
Phone
(603) 692-2228
Fax
(603) 692-4748
NPI assigned
Sep 26, 2006
Last updated
Apr 16, 2026By the provider in NPPES
Organization subpart
No

NPPES NPI Registry

Updated by the provider on Apr 16, 2026

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

Authorized official

Name
Sean P Lynch, MDNPI 1326222431
Title
President
Phone
(603) 692-2228

Authorized official NPPES reports the official by name only. The link goes to the one practitioner connected to this organization with that name.

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Gastroenterology Physician 207RG0100X Primary

Addresses

Primary practice location

21 Clark Way
Somersworth, NH 03878-4401

Mailing address

21 Clark Way
Somersworth, NH 03878-4401
Phone (603) 692-2228

Other practice location 1

330 Borthwick Ave Ste 311
Portsmouth, NH 03801-7112
Phone (603) 692-2228

Other practice location 2

330 Borthwick Ave Ste 300
Portsmouth, NH 03801-7109
Phone (603) 692-2228

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in NH

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
O20040308000758 NH Part B Supplier - Clinic/Group Practice 0941198329 Receives reassigned benefits from 18 practitioners
Practice locations: Portsmouth, NH; Somersworth, NH

Laboratory certificates & supplier records

Derived by NPIMap

These CMS records do not include an NPI. They are shown because their name and street address match this provider’s.

CLIA laboratory certificates

CLIA numberLaboratoryCertificateExpires
30D0087071Atlantic Digestive Specialists, PLLC21 Clark Way, Somersworth, NH 03878Certificate of waiverAug 31, 2026

National Provider Directory

National Provider Directory

Locations

55 High St
Ste 202
Hampton, NH 03842
Phone (603) 926-1101

330 Borthwick Ave
Ste 311
Portsmouth, NH 03801
Phone (603) 433-2488

21 Clark Way
Somersworth, NH 03878
Phone (603) 692-2228

21 Clark Way
#108
Somersworth, NH 03878

Interoperability endpoints

  • FHIR API: https://fhir-api.fhirprod.aws.greenwayhealth.com/fhir/R4/2.16.840.1.113883.3.140.72809

Practitioners & affiliated clinicians

Practitioners 21

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles, and the practitioner matching its NPPES authorized official.

View all 21

NPI Registry JSON

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

{
    "created_epoch": "1159228800000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1776297600000",
    "number": "1316048069",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "21 CLARK WAY",
            "city": "SOMERSWORTH",
            "state": "NH",
            "postal_code": "038784401",
            "telephone_number": "603-692-2228",
            "fax_number": "603-692-4748"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "21 CLARK WAY",
            "city": "SOMERSWORTH",
            "state": "NH",
            "postal_code": "038784401",
            "telephone_number": "603-692-2228",
            "fax_number": "603-692-4748"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "330 Borthwick Ave Ste 311",
            "address_purpose": "LOCATION",
            "city": "Portsmouth",
            "state": "NH",
            "postal_code": "038017112",
            "country_code": "US",
            "telephone_number": "603-692-2228",
            "fax_number": "603-692-4748",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "330 Borthwick Ave Ste 300",
            "address_purpose": "LOCATION",
            "city": "Portsmouth",
            "state": "NH",
            "postal_code": "038017109",
            "country_code": "US",
            "telephone_number": "603-692-2228",
            "fax_number": "603-692-4748",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "organization_name": "ATLANTIC DIGESTIVE SPECIALISTS, PLLC",
        "organizational_subpart": "NO",
        "enumeration_date": "2006-09-26",
        "last_updated": "2026-04-16",
        "certification_date": "2026-04-16",
        "status": "A",
        "authorized_official_last_name": "LYNCH",
        "authorized_official_first_name": "SEAN",
        "authorized_official_middle_name": "P",
        "authorized_official_title_or_position": "PRESIDENT",
        "authorized_official_telephone_number": "603-692-2228",
        "authorized_official_credential": "MD"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Somersworth, NH

Sources for this page

  • NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 16, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
  • Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
  • 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.