Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Dan S Grinstead, M.D.

Internal Medicine Physician in Walla Walla, WA · enumerated 2006.

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

National Provider Identifier

1881668010

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Registry record

Entity type Individual (Type 1)

Name Dr. Dan S Grinstead

Credential M.D.

Sex Male

Practice address 55 W Tietan St, Walla Walla, WA, 99362

Phone (509) 525-3720

Fax (509) 522-1588

Enumeration date Feb 14, 2006

Last updated in NPPES Nov 27, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD00044572 (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
P00201205	Other	WA	RAIL ROAD MEDICARE
0194945	Other	WA	L&I
8418337	Medicaid	WA	-
023157	Medicaid	OR	-

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 Dan Grinstead's NPI record?

Cross-check NPI 1881668010 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1881668010 active?

Yes, as of the latest NPPES snapshot, NPI 1881668010 is active (record last updated 2007-11-27).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-11-27.