Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Gretchen Denike Irion, PHARM.D.

Pharmacist in Redwood City, CA · enumerated 2012.

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

National Provider Identifier

1205172053

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Registry record

Entity type Individual (Type 1)

Name Mrs. Gretchen Denike Irion

Credential PHARM.D.

Sex Female

Practice address 170 Alameda De Las Pulgas, Pharmacy Department, Redwood City, CA, 94062

Phone (650) 367-5534

Enumeration date Dec 26, 2012

Last updated in NPPES Dec 26, 2012

Taxonomy & licenses

183500000X Pharmacist Pharmacy Service Providers · License RPH 49535 (CA) Primary

PHARMD · Doctor of Pharmacy: A licensed pharmacist with a professional doctorate in pharmacy. About the PHARMD 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 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.

What specialty is Gretchen Irion?

Gretchen Irion is registered in NPPES with the primary taxonomy of Pharmacist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-12-26.