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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Frank Du, R.N.

Case Management Registered Nurse in Sunnyvale, CA · enumerated 2007.

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

National Provider Identifier

1689855637

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Registry record

Entity type Individual (Type 1)
Name Mr. Frank Du
Credential R.N.
Sex Male
Practice address 660 S Fair Oaks Ave, Sunnyvale, CA, 94086
Phone (408) 992-4938
Fax (408) 992-4901
Enumeration date Nov 19, 2007
Last updated in NPPES Nov 19, 2007

Taxonomy & licenses

163WC0400X Case Management Registered Nurse Nursing Service Providers · License 518414 (CA) Primary
RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN 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

Is NPI 1689855637 active?
Yes, as of the latest NPPES snapshot, NPI 1689855637 is active (record last updated 2007-11-19).
How do I verify Frank Du's NPI record?
Cross-check NPI 1689855637 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 2007-11-19.