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

THOMAS DERLETH M.D.
NPI 1477550978
Internal Medicine - Hematology & Oncology in Bellingham, WA

Active since June 30, 2005
4545 CORDATA PKWY, BELLINGHAM, WA 98226(360) 738-2200 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Thomas Derleth M.d. NPPES

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

THOMAS DERLETH M.D. (NPI 1477550978) is an individual hematology & oncology provider in Bellingham, Washington, licensed in Washington (MD00012694) and active in the NPI registry since June 2005.

NPPES Registry Identity

NPI1477550978
Entity TypeIndividualMale
Primary Taxonomy207RH0003X
Provider Legal NameTHOMAS DERLETHCredential: M.D.
Location Address4545 CORDATA PKWYBellingham, WA 98226-7123
Mailing Address4545 Cordata PkwyBellingham, WA 98226-7123 · (360) 738-2200
Phone(360) 738-2200
Sole ProprietorNo
Enumeration DateJune 30, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1477550978 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RH0003X
License✔ Licensed in WA · MD00012694
Definition
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
4545 CORDATA PKWY, Bellingham, WA 98226
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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.

MELANIE R HARTLEY ARNP
Nurse Practitioner (Pediatrics, Critical Care)
4545 CORDATA PKWY, SUITE 1E
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
LESLIE HOUCK M.D.
Obstetrics & Gynecology (Gynecology)
4545 CORDATA PKWY
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
MADRONA MEDICAL GROUP,PS
Clinic/Center (Radiology)
4545 CORDATA PKWY
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
JOAN MARY CERVISI ARNP
Nurse Practitioner (Pediatrics)
4545 CORDATA PKWY
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
DR. SUKHJIT SINGH SHERGILL
Internal Medicine
4545 CORDATA PKWY, SUITE 2B
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
DIANA GUZA-WELLS M.D.
Internal Medicine
4545 CORDATA PKWY
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
RADU IVAN ARNP
Nurse Practitioner (Adult Health)
4545 CORDATA PKWY, SUITE 2A & 2B
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
DIANNE C. FOSTER ARNP
Nurse Practitioner (Obstetrics & Gynecology)
4545 CORDATA PKWY
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200

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 Thomas Derleth's NPI number?

The NPI number for Thomas Derleth is 1477550978. It was assigned to this individual provider in the NPPES registry on June 30, 2005.

Where is Thomas Derleth located?

Thomas Derleth practices at 4545 Cordata Pkwy, Bellingham, WA 98226. The listed phone number is (360) 738-2200.

What is Thomas Derleth's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

When was this NPI record last updated?

The NPPES record for Thomas Derleth 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 36 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.