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

ROBERT M GANNAN MD PHD
NPI 1811976533
Internal Medicine - Gastroenterology in Bellevue, WA

Q: What is Robert Gannan's NPI number?

The NPI number for Robert Gannan is 1811976533. It was assigned to this individual provider in the NPPES registry on January 11, 2006.

Q: What is Robert Gannan's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Robert Gannan was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 28 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.

Active since January 11, 2006

1135 116TH AVE NE, 560, BELLEVUE, WA 98004(425) 454-4768(425) 462-8021 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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About Robert M Gannan Md Phd NPPES

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

ROBERT M GANNAN MD PHD (NPI 1811976533) is an individual gastroenterology provider in Bellevue, Washington, licensed in Washington (16481) and active in the NPI registry since January 2006.

NPPES Registry Identity

NPI1811976533

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameROBERT M GANNANCredential: MD PHD

Location Address1135 116TH AVE NE, 560Bellevue, WA 98004-4623

Mailing Address1135 116th Ave Ne, 560Bellevue, WA 98004-4623 · (425) 454-4768 · Fax (425) 462-8021

Phone(425) 454-4768

Fax(425) 462-8021

Sole ProprietorNo

Enumeration DateJanuary 11, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1811976533 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in WA · 16481

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.

1135 116TH AVE NE, Bellevue, WA 98004

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Other Identifiers 2

Other96596WA · L & I

Medicaid1165208WA

Other Providers at the Same Location NPPES 20

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

JOSEPH W DOUCETTE M.D.

Internal Medicine (Cardiovascular Disease)

1135 116TH AVE NE, SUITE 600
BELLEVUE, WA 98004

King County (425) 454-2656

WASHINGTON IMAGING SERVICES LLC

Specialist

1135 116TH AVE NE, STE 260
BELLEVUE, WA 98004

King County (425) 688-0100

ROANNE R E SELINGER MD

Internal Medicine (Gastroenterology)

1135 116TH AVE NE, #560
BELLEVUE, WA 98004

King County (425) 454-4768

OVERLAKE BREAST IMAGING LLC

Clinic/Center (Radiology)

1135 116TH AVE NE, SUITE 255
BELLEVUE, WA 98004

King County (425) 467-3754

DAVID C MORTON M.D.

Internal Medicine

1135 116TH AVE NE, SUITE 110A
BELLEVUE, WA 98004

King County (425) 289-3100

SHIE-PON TZUNG MD PHD

Internal Medicine (Gastroenterology)

1135 116TH AVE NE, #560
BELLEVUE, WA 98004

King County (425) 454-4768

PROLIANCE SURGEONS INC., P.S.

Orthopaedic Surgery

1135 116TH AVE NE, SUITE 510
BELLEVUE, WA 98004

King County (425) 455-3600

OVERLAKE MEDICAL TOWER PHARMACY

Pharmacy (Community/Retail Pharmacy)

1135 116TH AVE NE, STE 105
BELLEVUE, WA 98004

King County (425) 688-5958

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 Robert Gannan's NPI number?

The NPI number for Robert Gannan is 1811976533. It was assigned to this individual provider in the NPPES registry on January 11, 2006.

Where is Robert Gannan located?

Robert Gannan practices at 1135 116th Ave NE 560, Bellevue, WA 98004. The listed phone number is (425) 454-4768.

What is Robert Gannan's specialty?

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

When was this NPI record last updated?

The NPPES record for Robert Gannan was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 28 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.