Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Sylvian Hien Ung, O.D.
Optometrist in Austin, TX · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1659338291
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Registry record
Entity type Individual (Type 1)
Name Dr. Sylvian Hien Ung
Credential O.D.
Sex Female
Practice address 1700 S Mo Pac Expy, Austin, TX, 78746
Phone (512) 327-7000
Fax (512) 314-1660
Enumeration date Apr 27, 2006
Last updated in NPPES Feb 23, 2021
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD 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
Where does Sylvian Ung practice?
The practice location on file with NPPES is in Austin, TX. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Sylvian Ung?
The National Provider Identifier (NPI) for Sylvian Ung is 1659338291, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Kristin Sargent Ophthalmology Physician · Austin, TX NPI 1508841644 Robin Watson Optometrist · Austin, TX NPI 1083699748 Douglas Lewis Ophthalmology Physician · Austin, TX NPI 1225013980 Rebekah Young Optometrist · Austin, TX NPI 1558578559 Radha Ram Ophthalmology Physician · Austin, TX NPI 1093081085
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-23.