John Nicholas Sienko, O.D.
Optometrist · Wallingford, CT
John Nicholas Sienko, O.D. is an optometrist with a practice address in Wallingford, Connecticut, and NPI 1194895524, issued on Nov 9, 2006. Check the license (Connecticut 914, as entered in NPPES) with the Connecticut board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Nicholas Sienko
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 914 CT
Self-reported in NPPES; status is on the state search - Practice location
- 821 N Main Street Ext, Wallingford, CT 06492
- Phone
- (203) 265-5152
- Enumerated
- Nov 9, 2006
- Record last updated
- Mar 16, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (203) 265-1562
- Medicaid ID
- 004-08-1262 CT
- Entity
- Type 1 · individual
8 nearest optometrist records → All 675 in Connecticut → Look up another NPI →
Also registered at 821 N Main Street Ext
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Janine Albanese, O.D.Optometrist1174964076
- Kenneth Elder, ODOptometrist1922170224
Verify John Nicholas Sienko in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Connecticut board licenses this profession
Search for license 914Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Nicholas Sienko among 675 optometrist records in Connecticut
John Nicholas Sienko, O.D. is one of 675 optometrist records with a practice address in Connecticut. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 57% newer
- In a Medicare fileNo · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2010 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Optometrist providers in Connecticut
There are 675 optometrist records in Connecticut. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 675 in Connecticut → Every provider in Wallingford → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Janine Albanese, O.D.Wallingford, CT 064921174964076
- Linda Caliolo, O.D.Wallingford, CT 064921164567921
- Terri Cyr, DR ODWallingford, CT 064921003022377
- Kenneth Elder, ODWallingford, CT 064921922170224
- Eugene Fei, ODWallingford, CT 064921366554081
- Priscilla Kuo, ODWallingford, CT 064921700445632
- Francisco Pimentel, O.D.Wallingford, CT 064921114087855
- Thomas Arnista, O.D.Southington, CT 064891811089188
Common questions
What is John Nicholas Sienko, O.D.'s NPI number?
John Nicholas Sienko, O.D.'s National Provider Identifier (NPI) is 1194895524, issued on Nov 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Nicholas Sienko, O.D. located?
The NPPES record lists a practice address at 821 N Main Street Ext, Wallingford, CT, 06492. Phone: (203) 265-5152. Providers update this record themselves, so call before visiting.
How can I verify John Nicholas Sienko, O.D.'s license?
NPPES lists Connecticut license number 914, as entered by the provider. Search the Connecticut board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.