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ATLANTIC DIGESTIVE SPECIALISTS, PLLC
NPI 1316048069
Internal Medicine - Gastroenterology in Somersworth, NH

Active since September 26, 2006CLIA Certified · 2 labs
21 CLARK WAY, SOMERSWORTH, NH 03878(603) 692-2228(603) 692-4748 Get Directions Write a Review

NPPES record last updated: April 16, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Apr 16, 2026, Apr 12, 2017 (2 updates tracked since 2017).

About Atlantic Digestive Specialists, Pllc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ATLANTIC DIGESTIVE SPECIALISTS, PLLC (NPI 1316048069) is a healthcare organization registered as a gastroenterology in Somersworth, New Hampshire and active in the NPI registry since September 2006. The organization holds 2 active CLIA laboratory certificates, maintains 2 additional practice locations, and lists Sean P Lynch, President, as its authorized official.

NPPES Registry Identity

NPI1316048069
Entity TypeOrganization
Primary Taxonomy207RG0100X
Legal Business NameATLANTIC DIGESTIVE SPECIALISTS, PLLC
Location Address21 CLARK WAYSomersworth, NH 03878-4401
Mailing Address21 Clark WaySomersworth, NH 03878-4401 · (603) 692-2228 · Fax (603) 692-4748
Phone(603) 692-2228
Fax(603) 692-4748
Organization SubpartNo
Authorized OfficialSean P LynchPresident · (603) 692-2228
Enumeration DateSeptember 26, 2006
Last NPPES UpdateApril 16, 20262 updates tracked since enumeration
NPPES CertifiedApril 16, 2026
✔ NPI 1316048069 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

21 CLARK WAY, Somersworth, NH 03878
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Secondary Practice Locations 2

Location 1330 Borthwick Ave Ste 311Portsmouth, NH 03801-7112 · Phone (603) 692-2228 · Fax (603) 692-4748
Location 2330 Borthwick Ave Ste 300Portsmouth, NH 03801-7109 · Phone (603) 692-2228 · Fax (603) 692-4748

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Sheld, Anthem Blue Cross and Blue Shield, WellSense Health Plan.Insurance ›

CLIA Laboratory Certificates CMS CLIA 2

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 30D0087071

Atlantic Digestive Specialists, PLLC · Somersworth, NH
Active · expires Aug 31, 2026
CLIA Number30D0087071
Laboratory TypePhysician Office
Certificate Effective DateSeptember 1, 2024
Certificate Expiration DateAugust 31, 2026
Laboratory DirectorSean Lynch
Laboratory Phone(603) 749-2413
Laboratory LocationAtlantic Digestive Specialists, PLLC21 Clark Way, Somersworth, NH 03878
CLIA data matches this NPI record on: Address Name
This certificate is issued to a laboratory to perform only waived tests.

Certificate of Waiver 30D0717428

Atlantic Digestic Specialists, PLLC · Portsmouth, NH
Active · expires Jun 23, 2027
CLIA Number30D0717428
Laboratory TypePhysician Office
Certificate Effective DateJune 24, 2025
Certificate Expiration DateJune 23, 2027
Laboratory DirectorRoger M. Epstein
Laboratory Phone(603) 433-2488
Laboratory LocationAtlantic Digestic Specialists, PLLC330 Borthwick Ave Suite 311, Portsmouth, NH 03801
CLIA data matches this NPI record on: Address
This certificate is issued to a laboratory to perform only waived tests.

Other Providers at the Same Location NPPES 13

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JENNIFER M LEWIS MD
Internal Medicine (Gastroenterology)
21 CLARK WAY
SOMERSWORTH, NH 03878
Strafford County (603) 692-2228
MRS. SONYA W ALYEA APRN
Nurse Practitioner
21 CLARK WAY
SOMERSWORTH, NH 03878
Strafford County (603) 692-2228
SUKEERTI KESAR M.D.
Internal Medicine (Gastroenterology)
21 CLARK WAY
SOMERSWORTH, NH 03878
Strafford County (603) 692-2228
SHELBY ANNE MENARD
Nurse Practitioner
21 CLARK WAY
SOMERSWORTH, NH 03878
Strafford County (603) 692-2228
DALIA MAHMOUD HASSAN ELAMIN MD
Internal Medicine (Gastroenterology)
21 CLARK WAY
SOMERSWORTH, NH 03878
Strafford County (603) 692-2228
KERRY MARIE LOAN PA-C
Physician Assistant (Medical)
21 CLARK WAY
SOMERSWORTH, NH 03878
Strafford County (603) 692-2228
SEAN LYNCH MD
Internal Medicine (Gastroenterology)
21 CLARK WAY
SOMERSWORTH, NH 03878
Strafford County (603) 692-2228
DR. ROBERT A RUBEN M.D.
Specialist
21 CLARK WAY
SOMERSWORTH, NH 03878
Strafford County (603) 692-2228

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Atlantic Digestive Specialists, PLLC's NPI number?

The NPI number for Atlantic Digestive Specialists, PLLC is 1316048069. It was assigned to this organization in the NPPES registry on September 26, 2006.

Where is Atlantic Digestive Specialists, PLLC located?

Atlantic Digestive Specialists, PLLC is located at 21 Clark Way, Somersworth, NH 03878. The listed phone number is (603) 692-2228.

What is Atlantic Digestive Specialists, PLLC's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Does Atlantic Digestive Specialists, PLLC hold CLIA laboratory certificates?

Yes. 2 active CLIA laboratory certificates are associated with this NPI under the federal Clinical Laboratory Improvement Amendments program. The certificates are listed in the CLIA Laboratory Certificates section above.

What insurance does Atlantic Digestive Specialists, PLLC accept?

Health plans from Anthem Blue Cross and Blue Sheld, Anthem Blue Cross and Blue Shield and WellSense Health Plan list Atlantic Digestive Specialists, PLLC as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Atlantic Digestive Specialists, PLLC was last updated on April 16, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.