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Irene Ang Dy, MD

Hematology (Internal Medicine) Physician in Castro Valley, CA · enumerated 2009.

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

National Provider Identifier

1528393063

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Registry record

Entity type Individual (Type 1)
Name Irene Ang Dy
Credential MD
Sex Female
Practice address 20055 Lake Chabot Rd Ste 130, Castro Valley, CA, 94546
Phone (510) 888-0657
Enumeration date Oct 15, 2009
Last updated in NPPES Oct 16, 2024

Taxonomy & licenses

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License A120038 (CA) Secondary
207RH0000X Hematology (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License A120038 (CA) 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.

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Frequently asked questions

Where does Irene Dy practice?
The practice location on file with NPPES is in Castro Valley, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Irene Dy?
The National Provider Identifier (NPI) for Irene Dy is 1528393063, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-10-16.