Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Duyen C Xin, OD
Optometrist in Alton, IL · enumerated 2011.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1871871657
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Registry record
Entity type Individual (Type 1)
Name Dr. Duyen C Xin
Credential OD
Sex Female
Practice address 211 E Broadway, Alton, IL, 62002
Phone (618) 462-9818
Fax (314) 741-4947
Enumeration date Jul 28, 2011
Last updated in NPPES Aug 16, 2018
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 Duyen Xin practice?
The practice location on file with NPPES is in Alton, IL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Duyen Xin?
The National Provider Identifier (NPI) for Duyen Xin is 1871871657, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-08-16.