Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gregory Warner, RPH

Pharmacist in Tamuning, GU · enumerated 2009.

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

National Provider Identifier

1538307541

Verified

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Registry record

Entity type Individual (Type 1)

Name Gregory Warner

Credential RPH

Sex Male

Practice address 548 S Marine Corps Dr, Tamuning, GU, 96913

Phone (671) 646-5825

Fax (671) 647-3598

Enumeration date Jan 29, 2009

Last updated in NPPES Jan 29, 2009

Taxonomy & licenses

183500000X Pharmacist Pharmacy Service Providers · License RPH51127 (CA) Secondary

183500000X Pharmacist Pharmacy Service Providers · License 260882-1701 (UT) Secondary

183500000X Pharmacist Pharmacy Service Providers · License PH145 (GU) Primary

RPH · Registered Pharmacist: A licensed pharmacist registered with a state board of pharmacy. About the RPH 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

Is NPI 1538307541 active?

Yes, as of the latest NPPES snapshot, NPI 1538307541 is active (record last updated 2009-01-29).

How do I verify Gregory Warner's NPI record?

Cross-check NPI 1538307541 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-01-29.