Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

John Sic-Yiu Liu

Individual provider Optometrist · NPI 1114949419

John Sic-Yiu Liu is an Optometrist in Castro Valley, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2006

Practice location Address checks out

3550 Castro Valley Blvd
Castro Valley, CA 94546-4402
Phone: (510) 581-1680
Fax: (510) 581-5070
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Optometrist (primary) Taxonomy 152W00000X · Licence 6498T (CA)

Record details

NPI number1114949419
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorYes
NPI enumeratedJuly 24, 2006
Last updated in NPPESJune 16, 2009
Mailing address3550 Castro Valley Blvd, Castro Valley, CA 94546-4402

Other providers in Castro Valley