Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gregory Charles Allen, MD

Anesthesiology Physician in Olympia, WA · enumerated 2006.

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

National Provider Identifier

1669433538

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory Charles Allen

Credential MD

Sex Male

Practice address 3435 Martin Way E Ste G, Olympia, WA, 98506

Phone (360) 438-6400

Fax (360) 438-6435

Enumeration date Mar 31, 2006

Last updated in NPPES Aug 30, 2019

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License MD00037436 (WA) Primary

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

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

How do I verify Gregory Allen's NPI record?

Cross-check NPI 1669433538 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1669433538 active?

Yes, as of the latest NPPES snapshot, NPI 1669433538 is active (record last updated 2019-08-30).

Other providers at this practice address

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Dale Disalvo Anesthesiology Physician · Olympia, WA NPI 1316391089 Casey Stevick Anesthesiology Physician · Olympia, WA NPI 1528591237

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-08-30.