Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

GASTROINTESTINAL ASSOCIATES OF MARYLAND PA
NPI 1164404125
Internal Medicine - Gastroenterology in Waldorf, MD

Q: What is Gastrointestinal Associates Of Maryland PA's specialty?

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

Active since November 16, 2005CLIA 21D1022768 · Certificate of Compliance

3510 OLD WASHINGTON RD STE 201, WALDORF, MD 20602(301) 645-8035(301) 645-5229 Get Directions Write a Review

NPPES record last updated: July 29, 2026. Verified against the NPPES registry weekly; last sync: August 30, 2026.

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About Gastrointestinal Associates Of Maryland Pa NPPES

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

GASTROINTESTINAL ASSOCIATES OF MARYLAND PA (NPI 1164404125), doing business as Gi Associates, is a healthcare organization registered as a gastroenterology in Waldorf, Maryland and active in the NPI registry since November 2005. The organization holds a CLIA Certificate of Compliance certificate valid through September 29, 2027 and lists Alexis Addison, Practice Director, as its authorized official.

NPPES Registry Identity

NPI1164404125

Entity TypeOrganization

Primary Taxonomy207RG0100X

Legal Business NameGASTROINTESTINAL ASSOCIATES OF MARYLAND PA

Location Address3510 OLD WASHINGTON RD STE 201Waldorf, MD 20602-3235

Mailing Address3510 Old Washington Rd Ste 201Waldorf, MD 20602-3235 · (301) 645-8035 · Fax (301) 645-5229

Phone(301) 645-8035

Fax(301) 645-5229

Organization SubpartNo

Authorized OfficialAlexis AddisonPractice Director · (301) 645-8035

Enumeration DateNovember 16, 2005

Last NPPES UpdateJuly 29, 2026

NPPES CertifiedJuly 29, 2026

✔ NPI 1164404125 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.

3510 OLD WASHINGTON RD STE 201, Waldorf, MD 20602

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Other Names 1

Doing Business AsGi Associates

Other Identifiers 2

Medicaid035197200DC

Medicaid155700900MD

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

CLIA Laboratory Certificates CMS CLIA

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 Compliance 21D1022768

Gi Associates Of Maryland · Waldorf, MD

Active · expires Sep 29, 2027

CLIA Number21D1022768

Laboratory TypePhysician Office

Certificate Effective DateSeptember 30, 2025

Certificate Expiration DateSeptember 29, 2027

Laboratory DirectorDr. Michael S. Ballo

Laboratory Phone(301) 645-8035

Laboratory LocationGi Associates Of Maryland3510 Old Washington Rd, Suite 201, Waldorf, MD 20602

CLIA data matches this NPI record on: Address Name Phone

This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

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 Gastrointestinal Associates Of Maryland PA's NPI number?

The NPI number for Gastrointestinal Associates Of Maryland PA is 1164404125. It was assigned to this organization in the NPPES registry on November 16, 2005. The provider is doing business as GI Associates.

Where is Gastrointestinal Associates Of Maryland PA located?

Gastrointestinal Associates Of Maryland PA is located at 3510 Old Washington Rd Ste 201, Waldorf, MD 20602. The listed phone number is (301) 645-8035.

What is Gastrointestinal Associates Of Maryland PA's specialty?

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

Does Gastrointestinal Associates Of Maryland PA hold a CLIA laboratory certificate?

Yes. A Certificate of Compliance (number 21D1022768) is associated with this NPI, valid through September 29, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Gastrointestinal Associates Of Maryland PA was last updated on July 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 41 days 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.