Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dennis L Simpson, M.D.

Internal Medicine Physician in Pullman, WA · enumerated 2006 · practices at Palouse Medical Ps.

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

National Provider Identifier

1316979644

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Registry record

Entity type Individual (Type 1)

Name Dennis L Simpson

Credential M.D.

Sex Male

Practice address 825 Se Bishop Blvd Ste 200, Pullman, WA, 99163

Phone (509) 332-2517

Fax (509) 334-9247

Enumeration date Jul 7, 2006

Last updated in NPPES Jul 7, 2021

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD00020233 (WA) Primary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License M-4552 (ID) Secondary

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
1055201	Medicaid	WA	-
003203100	Medicaid	ID	-

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Dennis Simpson?

Dennis Simpson is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-07.