LONDONDERRY GASTROENTEROLOGY ASSOCIATES PA
NPI 1851318281
Specialist in Londonderry, NH

Q: What is Londonderry Gastroenterology Associates PA's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Active since July 15, 2006

1B COMMONS DR, UNIT 9A, LONDONDERRY, NH 03053(603) 818-4712(603) 421-6899 Get Directions Write a Review

NPPES record last updated: October 19, 2015. Verified against the NPPES registry weekly; last sync: November 01, 2026.

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About Londonderry Gastroenterology Associates Pa NPPES

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

LONDONDERRY GASTROENTEROLOGY ASSOCIATES PA (NPI 1851318281) is a healthcare organization registered as a specialist in Londonderry, New Hampshire and active in the NPI registry since July 2006. The organization lists Mark Kenneth Detweiler, Physician, as its authorized official.

NPPES Registry Identity

NPI1851318281

Entity TypeOrganization

Primary Taxonomy174400000X

Legal Business NameLONDONDERRY GASTROENTEROLOGY ASSOCIATES PA

Location Address1B COMMONS DR, UNIT 9ALondonderry, NH 03053-3441

Mailing Address1 Commons Dr # B, Unit 9aLondonderry, NH 03053-3441 · (603) 818-4712 · Fax (603) 421-6899

Phone(603) 818-4712

Fax(603) 421-6899

Organization SubpartNo

Authorized OfficialMark Kenneth DetweilerPhysician · (603) 818-4712

Enumeration DateJuly 15, 2006

Last NPPES UpdateOctober 19, 2015

✔ NPI 1851318281 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers

Taxonomy Code174400000X

License✔ Licensed in NH · 6919

Definition

An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.

1B COMMONS DR, Londonderry, NH 03053

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Other Identifiers 2

Medicaid80001279NH

Medicare UPINRE1279NH

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

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Londonderry Gastroenterology Associates Pa is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Londonderry Gastroenterology Associates PA, which bills Medicare for the services this clinician delivers.

Clinician (1)

Mark Detweiler, M.D.

Gastroenterology

NPI 1548344583

1B COMMONS DR UNIT 9A
Londonderry, NH 03053

(603) 818-4712

✔ PECOS✔ Accepts MedicareSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Londonderry Gastroenterology Associates PA's NPI number?

The NPI number for Londonderry Gastroenterology Associates PA is 1851318281. It was assigned to this organization in the NPPES registry on July 15, 2006.

Where is Londonderry Gastroenterology Associates PA located?

Londonderry Gastroenterology Associates PA is located at 1B Commons Dr Unit 9A, Londonderry, NH 03053. The listed phone number is (603) 818-4712.

What is Londonderry Gastroenterology Associates PA's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Londonderry Gastroenterology Associates PA enrolled in Medicare?

Yes. Londonderry Gastroenterology Associates PA is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Londonderry Gastroenterology Associates PA?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Gastroenterology) reassigns their Medicare billing to Londonderry Gastroenterology Associates PA. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Londonderry Gastroenterology Associates PA was last updated on October 19, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.