Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark Hsu, MD
Urology Physician in Fremont, CA · enumerated 2010.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1851616486
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Registry record
Entity type Individual (Type 1)
Name Mark Hsu
Credential MD
Sex Male
Practice address 39141 Civic Center Dr Ste 335, Fremont, CA, 94538
Phone (510) 248-1414
Enumeration date Apr 7, 2010
Last updated in NPPES Mar 18, 2019
Taxonomy & licenses
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.
Frequently asked questions
What is the NPI number for Mark Hsu?
The National Provider Identifier (NPI) for Mark Hsu is 1851616486, a Type 1 (individual) record in the CMS NPPES registry.
Where does Mark Hsu practice?
The practice location on file with NPPES is in Fremont, CA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Karen Garn Physician Assistant · Fremont, CA NPI 1538168067 Rakesh Safaya Vascular Surgery Physician · Fremont, CA NPI 1144337866 Stella Asuquo Vascular Surgery Physician · Fremont, CA NPI 1437460177 Joyce Lu Vascular Surgery Physician · Fremont, CA NPI 1154772515 Joshua Amano Physician Assistant · Fremont, CA NPI 1992328975 Emily Gentry Surgical Physician Assistant · Fremont, CA NPI 1235893645 Ann Zheng Physician Assistant · Fremont, CA NPI 1215714910
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-03-18.