Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Irene Cheng, PHARMD

Oncology Pharmacist in Ontario, CA · enumerated 2006.

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

National Provider Identifier

1538221346

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Registry record

Entity type Individual (Type 1)

Name Dr. Irene Cheng

Credential PHARMD

Sex Female

Practice address 2295 S Vineyard Ave, Mob A, Basement, Medical Oncology, Ontario, CA, 91761

Phone (909) 724-2140

Fax (909) 724-2141

Enumeration date Dec 15, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1835X0200X Oncology Pharmacist Pharmacy Service Providers · License RPH 49794 (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

How do I verify Irene Cheng's NPI record?

Cross-check NPI 1538221346 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1538221346 active?

Yes, as of the latest NPPES snapshot, NPI 1538221346 is active (record last updated 2007-07-08).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.