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

Dr. John Nicholas Sienko, OD

Individual provider Optometrist · NPI 1194895524

Dr. John Nicholas Sienko, OD is an Optometrist in Wallingford, Connecticut. Licensed in Connecticut. Registered with an NPI since 2006.

Licensed in
CT
In the registry since
2006
What do these letters mean?
OD — Doctor of Optometry
An optometrist: examines eyes, prescribes glasses and contacts, and treats many eye conditions.

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Practice location Address checks out

821 N Main Street Ext
Wallingford, CT 06492-2464
Phone: (203) 265-5152
Fax: (203) 265-1562
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Optometrist (primary) Taxonomy 152W00000X · Licence 914 (CT)

Record details

NPI number1194895524
Entity typeIndividual (Type 1)
GenderMale
Credentials OD
Sole proprietorNo
NPI enumeratedNovember 9, 2006
Last updated in NPPESMarch 16, 2010

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