Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

James Brad Diestelhorst, M.D.

Pulmonary Disease Physician in Bellingham, WA · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1336148766

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Registry record

Entity type Individual (Type 1)

Name James Brad Diestelhorst

Credential M.D.

Sex Male

Practice address 4545 Cordata Pkwy, Bellingham, WA, 98226

Phone (360) 738-2200

Fax (360) 752-5687

Enumeration date Jul 18, 2005

Last updated in NPPES Sep 22, 2010

Taxonomy & licenses

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License MD00041071 (WA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
4912DI	Other	WA	REGENCE
7704353	Other	WA	AETNA
1336148766	Medicaid	WA	-
0230369	Other	WA	L&I/CRIME VICTIMS
MD4918W	Other	AK	ALASKA MEDICAID
0230369	Other	WA	L&I AND CRIME VICTIMS

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify James Diestelhorst's NPI record?

Cross-check NPI 1336148766 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1336148766 active?

Yes, as of the latest NPPES snapshot, NPI 1336148766 is active (record last updated 2010-09-22).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-09-22.