Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Gerald Chunt-Sein Tiu, MD, PHD

Pediatric Hematology & Oncology Physician in Stanford, CA · enumerated 2021.

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

National Provider Identifier

1073195608

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Registry record

Entity type Individual (Type 1)

Name Mr. Gerald Chunt-Sein Tiu

Credential MD, PHD

Sex Male

Practice address 300 Pasteur Dr Bldg L235, Stanford, CA, 94305

Phone (650) 723-4000

Enumeration date Apr 23, 2021

Last updated in NPPES Jun 10, 2026

Taxonomy & licenses

2080P0207X Pediatric Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License GERALDCTIU (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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Gerald Tiu?

Gerald Tiu is registered in NPPES with the primary taxonomy of Pediatric Hematology & Oncology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Raymond Gong Anatomic Pathology & Clinical Pathology Physician · Stanford, CA NPI 1073036547 Seena Tabibi Anatomic Pathology & Clinical Pathology Physician · Palo Alto, CA NPI 1851955066 Lin Wang Student in an Organized Health Care Education/Training Program · Stanford, CA NPI 1164001822 Christina Su Student in an Organized Health Care Education/Training Program · Stanford, CA NPI 1932897840 Kyle Dyson Student in an Organized Health Care Education/Training Program · Stanford, CA NPI 1508555442 William Wey Student in an Organized Health Care Education/Training Program · Stanford, CA NPI 1730879750 Aaron Wilk Student in an Organized Health Care Education/Training Program · Stanford, CA NPI 1962258574 Jesus Lopez Student in an Organized Health Care Education/Training Program · Stanford, CA NPI 1093503559

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-10.