NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Andrew A Hsu, M.D.

Neurology Physician in Sunnyvale, CA · enumerated 2005.

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

National Provider Identifier

1366426694

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Andrew A Hsu
Credential M.D.
Sex Male
Practice address Sunnyvale, CA, 94087
Phone (408) 739-0070
Fax (408) 739-0090
Enumeration date Nov 30, 2005
Last updated in NPPES Dec 11, 2012

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License G36615 (CA) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
00G366150 Medicaid CA -

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 Andrew Hsu's NPI record?
Cross-check NPI 1366426694 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1366426694 active?
Yes, as of the latest NPPES snapshot, NPI 1366426694 is active (record last updated 2012-12-11).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-12-11.