Active NPI
Thomas Derleth, M.D.
- Hematology & Oncology Physician
- Bellingham, WA
National Provider Identifier
1477550978
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Hematology & Oncology Physician
- License
- MD00012694
- Practice address
- 4545 Cordata Pkwy
Bellingham, WA 98226-7123 - Phone
- (360) 738-2200
- NPI assigned
- Jun 30, 2005
- Sex
- Male
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Hematology & Oncology Physician | 207RH0003X | MD00012694 | WA | Primary |
Addresses
Primary practice location
4545 Cordata Pkwy
Bellingham, WA 98226-7123
Mailing address
4545 Cordata Pkwy
Bellingham, WA 98226-7123
Phone (360) 738-2200
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Not enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| MD00012694 | WA | MD | Hematology & Oncology Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1120089600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1477550978",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "4545 CORDATA PKWY",
"city": "BELLINGHAM",
"state": "WA",
"postal_code": "982267123",
"telephone_number": "360-738-2200"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "4545 CORDATA PKWY",
"city": "BELLINGHAM",
"state": "WA",
"postal_code": "982267123",
"telephone_number": "360-738-2200"
}
],
"practiceLocations": [],
"basic": {
"last_name": "DERLETH",
"first_name": "THOMAS",
"credential": "M.D.",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2005-06-30",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "207RH0003X",
"taxonomy_group": "",
"desc": "Internal Medicine, Hematology & Oncology",
"state": "WA",
"license": "MD00012694",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Bellingham, WA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.